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itself_o do_v present_o send_v upward_o and_o scatter_v abroad_o asume_v as_o thick_a and_o white_a as_o if_o there_o be_v a_o quantity_n of_o alabaster-dust_n throw_v up_o into_o the_o air_n and_o this_o smoke_n of_o the_o liquor_n last_v till_o my_o unwillingness_n to_o waste_v it_o invite_v i_o to_o stop_v it_o again_o and_o then_o the_o ascension_n of_o the_o fume_n sudden_o cease_v till_o the_o viol_n be_v again_o unstopped_a this_o fume_a liquor_n than_o i_o think_v will_v much_o conduce_v to_o the_o discovery_n i_o desire_v to_o make_v since_o it_o save_v i_o the_o need_n of_o convey_v any_o hot_a body_n with_o it_o into_o the_o receiver_n and_o will_v not_o darken_v it_o with_o fume_n before_o the_o time_n wherefore_o have_v tie_v to_o the_o viol_n a_o great_a weight_n of_o lead_n to_o keep_v it_o from_o be_v
with_o wax_n and_o afterward_o suffer_v to_o cool_v there_o will_v not_o be_v in_o the_o cavity_n of_o the_o aeolipile_n a_o resistance_n any_o thing_n near_o equal_a to_o the_o pressure_n of_o the_o outward_a air._n and_o therefore_o if_o you_o perforate_v the_o wax_n that_o air_n will_v violent_o be_v impel_v in_o at_o the_o unstop_v orifice_n whether_o the_o neck_n be_v hold_v parallel_n or_o perpendicular_a to_o the_o horizon_n or_o in_o any_o other_o situation_n in_o respect_n of_o the_o centre_n of_o the_o earth_n and_o the_o like_a will_v happen_v if_o the_o aeolipile_n be_v unstop_v under_o water_n next_o i_o relate_v in_o the_o mention_a history_n that_o have_v draw_v some_o of_o the_o air_n out_o of_o a_o large_a glass_n with_o a_o narrow_a mouth_n and_o thereby_o destroy_v the_o equality_n of_o force_n betwixt_o the_o weight_n of_o the_o outward_a air_n and_o the_o now_o weaken_a spring_n of_o the_o inward_a i_o find_v that_o by_o immediate_o apply_v a_o flat_a body_n to_o the_o orifice_n of_o the_o vessel_n that_o body_n be_v ready_o lift_v up_o and_o sustain_v in_o the_o air_n as_o long_o as_o i_o please_v though_o the_o weight_n of_o it_o exceed_v 20._o ounce_n three_o i_o late_o meet_v with_o the_o relation_n of_o a_o experiment_n which_o do_v abundant_o make_v out_o the_o power_n of_o the_o ambient_fw-la atmosphere_n to_o press_v body_n against_o each_o other_o when_o it_o can_v get_v between_o their_o internal_a surface_n for_o the_o ingenious_a author_n of_o the_o magdeburgick_a experiment_n write_v to_o the_o industrious_a schottus_n that_o have_v cause_v two_o copper_n plate_n to_o be_v make_v almost_o in_o the_o form_n of_o scale_n a_o little_a above_o half_a a_o ell_n in_o diameter_n and_o exact_o congruous_a if_o lay_v upon_o one_o another_o have_v say_v our_o jesuit_n si_fw-la mutuo_fw-la sibi_fw-la imponit_fw-la &_o aërem_fw-la extrahit_fw-la adeo_fw-la ab_fw-la externi_fw-la aëris_fw-la gravitate_fw-la 461._o compressae_fw-la atque_fw-la unitae_fw-la tenentur_fw-la ut_fw-la sex_n viri_fw-la robusti_fw-la eas_fw-la divellere_fw-la non_fw-la possint_fw-la quod_fw-la si_fw-la tandem_fw-la adhibito_fw-la omni_fw-la conatu_fw-la divellantur_fw-la crepitum_fw-la edunt_fw-la sclopeti_fw-la aut_fw-la musquetae_fw-la explosioni_fw-la non_fw-la minorem_fw-la quamprimum_fw-la vero_fw-la per_fw-la claviculum_fw-la feu_fw-fr epistomium_fw-la apertum_fw-la vel_fw-la minimus_fw-la aditus_fw-la laxatur_fw-la aëri_fw-la sponte_fw-la separantur_fw-la and_o four_o if_o a_o glass_n vial_n such_o as_o will_v be_v anon_o more_o full_o describe_v have_v a_o pipe_n open_a at_o both_o end_n so_o fit_v into_o it_o that_o no_o air_n can_v get_v in_o or_o out_o betwixt_o the_o neck_n and_o it_o and_o if_o the_o vial_n be_v so_o far_o fill_v with_o water_n that_o the_o low_a end_n of_o the_o pipe_n be_v well_o immerse_v therein_o if_o then_o you_o suck_v at_o the_o upper_a end_n of_o the_o pipe_n the_o water_n will_v ascend_v to_o a_o good_a height_n which_o argue_v its_o be_v force_v upward_o by_o the_o oblique_a pressure_n of_o the_o air_n in_o the_o vial_n for_o it_o be_v only_o in_o the_o pipe_n and_o not_o in_o the_o vial_n that_o there_o be_v any_o air_n in_o the_o same_o perpendicular_a with_o the_o water_n that_o be_v impel_v up_o but_o let_v we_o follow_v mr._n hobbs_n a_o little_a further_o have_v ask_v this_o question_n sed_fw-la vis_fw-la illa_fw-la elastica_fw-la quam_fw-la in_o aëre_fw-la esse_fw-la dicunt_fw-la nihilne_fw-la ad_fw-la marmor_fw-la sustinendum_fw-la confer_v potest_fw-la he_o answer_n nihil_fw-la omnino_fw-la non_fw-la enim_fw-la conatus_fw-la in_o aëre_fw-la est_fw-la 21._o ullus_fw-la ad_fw-la centrum_fw-la terrae_fw-la magis_fw-la quam_fw-la ad_fw-la aliud_fw-la quodvis_fw-la punctum_fw-la universi_fw-la quoniam_fw-la enim_fw-la gravia_fw-la omne_fw-la tendunt_fw-la à _fw-la circumferentia_fw-la atmosphaerae_fw-la ad_fw-la centrum_fw-la terrae_fw-la &_o inde_fw-la rursus_fw-la ad_fw-la circumferentiam_fw-la atmosphaerae_fw-la per_fw-la easdem_fw-la lineas_fw-la reflexas_fw-la conatus_fw-la sursum_fw-la conatui_fw-la deorsum_fw-la aequalis_fw-la erit_fw-la &_o proinde_fw-la mutuo_fw-la se_fw-la perimentes_fw-la neutrâ_fw-la conabuntur_fw-la viâ_fw-la but_o that_o the_o spring_n of_o the_o air_n may_v perform_v somewhat_o in_o the_o case_n propose_v i_o hope_v the_o newly-mentioned_a experiment_n have_v evince_v and_o the_o reason_n he_o annex_v to_o his_o negative_a as_o also_o the_o difficult_a example_n he_o subjoin_v of_o a_o man_n lie_v in_o the_o bottom_n of_o the_o sea_n seem_v rather_o oppose_v to_o the_o weight_n than_o the_o spring_n of_o the_o air._n but_o we_o have_v already_o both_o by_o experiment_n and_o by_o his_o own_o concession_n sufficient_o prove_v that_o the_o air_n be_v not_o devoid_a of_o gravity_n and_o that_o it_o likewise_o gravitates_fw-la upon_o the_o terraqueous_a globe_n which_o in_o this_o page_n he_o seem_v to_o deny_v we_o have_v prove_v by_o divers_a reason_n and_o particular_o in_o our_o 25._o experiment_n by_o the_o vast_a expansion_n of_o air_n under_o water_n when_o the_o pressure_n of_o the_o incumbent_a air_n be_v take_v off_o from_o the_o water_n as_o for_o the_o scheme_n he_o annex_v i_o confess_v i_o do_v not_o well_o see_v what_o he_o drive_v at_o in_o it_o at_o least_o if_o it_o be_v intend_v for_o a_o confutation_n of_o the_o conjecture_n i_o have_v be_v defend_v nor_o be_o i_o the_o only_a person_n that_o complain_v of_o his_o writing_n often_o enough_o obscure_o and_o as_o far_o as_o we_o can_v judge_v by_o the_o conclusion_n couch_v in_o these_o word_n non_fw-fr potest_fw-la ergo_fw-la pars_fw-la bc._n which_o in_o the_o explication_n of_o the_o scheme_n he_o call_v pars_fw-la atmosphaerae_fw-la intra_fw-la totam_fw-la posita_fw-la ubicunque_fw-la propter_fw-la magnitudinem_fw-la quantumvis_fw-la gravis_fw-la sit_fw-la descendere_fw-la neque_fw-la ergo_fw-la premere_fw-la sive_fw-la gravitare_fw-la his_o notion_n about_o gravity_n be_v somewhat_o strange_a and_o probable_o either_o do_v not_o concern_v we_o or_o will_v be_v find_v repugnant_a to_o those_o experiment_n on_o which_o our_o conjecture_n be_v ground_v and_o as_o for_o what_o he_o add_v si_fw-la possibile_fw-la esse_fw-la negarem_fw-la ut_fw-la diligentiâ_fw-la &_o arte_fw-la humanâ_fw-la dvae_fw-la superficies_n corporum_fw-la 22._o duorum_fw-la inter_fw-la se_fw-la per_fw-la omne_fw-la puncta_fw-la ita_fw-la accurate_a congruae_fw-la fiant_fw-la ut_fw-la ne_fw-la minimus_fw-la quidem_fw-la corpusculo_fw-la creabili_fw-la transitus_fw-la permittatur_fw-la non_fw-la video_fw-la quomodo_fw-la illi_fw-la aut_fw-la svam_fw-la hypothesim_n tueri_fw-la aut_fw-la negationem_fw-la nostram_fw-la improbitatis_fw-la arguere_fw-la jure_fw-la possent_fw-la i_o confess_v i_o do_v not_o see_v how_o this_o argumentation_n prove_v any_o thing_n against_o the_o interest_n either_o of_o the_o weight_n or_o so_o much_o as_o of_o the_o spring_n of_o the_o air_n in_o the_o cohesion_n of_o our_o marble_n for_o provide_v that_o the_o corpuscle_n of_o the_o air_n get_v not_o in_o between_o the_o two_o stone_n the_o pressure_n of_o the_o air_n may_v well_o suffice_v to_o keep_v they_o together_o and_o last_o as_o for_o that_o modest_a passage_n that_o immediate_o precede_v the_o word_n new_o recite_v wherein_o he_o say_v utraque_fw-la illa_fw-la phantasia_fw-la tum_fw-la gravitatis_fw-la atmosphaerae_fw-la tum_fw-la vis_fw-la elasticae_fw-la sive_fw-la antitupiae_fw-la aëris_fw-la 22._o somnium_fw-la erat_fw-la siquidem_fw-la autem_fw-la illis_fw-la concederetur_fw-la esse_fw-la aliquam_fw-la in_o filiculis_fw-la aëris_fw-la antitupiam_fw-la quaeretque_fw-la aliquis_fw-la unde_fw-la illa_fw-la curvata_fw-la quidem_fw-la sed_fw-la quiescentia_fw-la moverentur_fw-la rursus_fw-la ad_fw-la rectitudinem_fw-la deberent_fw-la illi_fw-la si_fw-la physici_fw-la haberi_fw-la volunt_fw-la causam_fw-la ejus_fw-la aliquam_fw-la possibilem_fw-la assignare_fw-la we_o have_v already_o give_v a_o account_n why_o we_o forbear_v to_o assign_v a_o cause_n of_o the_o motion_n of_o restitution_n but_o methinks_v mr._n hobbs_n may_v have_v for_o the_o speak_v so_o choose_v a_o fit_a place_n than_o this_o where_o he_o give_v i_o so_o far_o a_o opportunity_n to_o tell_v he_o again_o that_o he_o shall_v if_o he_o will_v be_v think_v a_o naturalist_n have_v assign_v some_o cause_n of_o the_o phaenomenon_n about_o which_o he_o have_v all_o this_o while_n be_v despute_v which_o since_o even_o he_o himself_o have_v decline_v to_o do_v perhaps_o the_o phaenomenon_n will_v be_v think_v somewhat_o difficult_a and_o my_o attempt_n at_o discover_v the_o cause_n of_o it_o will_v be_v at_o least_o excuse_v but_o after_o have_v so_o long_o dwell_v upon_o the_o consideration_n of_o our_o marble_n it_o be_v high_a time_n to_o proceed_v to_o what_o remain_v in_o the_o 24._o page_n mr._n hobbs_n have_v that_o passage_n i_o former_o recite_v touch_v the_o glass-fountain_n out_o of_o which_o water_n be_v throw_v up_o by_o compress_v air._n but_o though_o i_o as_o well_o as_o other_o have_v make_v use_n of_o such_o fountain_n invent_v by_o vincenzo_n vincenti_fw-la of_o urbino_n and_o be_v unsatisfied_a with_o the_o account_n he_o give_v of_o their_o phaenomena_n yet_o in_o regatd_v some_o learned_a man_n and_o particular_o dr._n ward_n have_v already_o examine_v
find_v out_o of_o the_o invisible_a cause_n of_o natural_a thing_n all_o will_v be_v in_o vain_a p._n 15._o cum_fw-la ejus_fw-la etc._n etc._n see_v almost_o all_o its_o part_n be_v flexil_n like_o little_a soft_a feather_n to_o fine_a thread_n ibid._n sed_fw-la quisquis_fw-la etc._n etc._n but_o it_o matter_n not_o who_o be_v the_o author_n of_o that_o supposition_n for_o the_o very_a hypothesis_n itself_o wherein_o be_v suppose_v a_o motion_n of_o subtle_a matter_n which_o be_v swift_a without_o any_o cause_n assign_v and_o have_v moreover_o divers_a innumerable_a circulation_n of_o corpuscle_n generate_v from_o the_o single_a motion_n of_o that_o matter_n be_v not_o the_o conceit_n of_o a_o man_n of_o wit_n or_o sense_n p._n 16._o nempe_fw-la hoc_fw-la etc._n etc._n this_o be_v the_o thing_n that_o the_o great_a des-cartes_n somewhere_o admire_v that_o he_o whether_o his_o position_n be_v true_a or_o false_a do_v never_o in_o argumentation_n make_v any_o right_a inference_n from_o his_o supposition_n p._n 17._o quod_fw-la sane_fw-la etc._n etc._n which_o be_v indeed_o a_o most_o evident_a argument_n of_o the_o weight_n of_o the_o air._n ibid._n quod_fw-la quidem_fw-la lanx_fw-la etc._n etc._n that_o the_o scale_n in_o which_o the_o bladder_n be_v be_v more_o depress_v than_o the_o other_o they_o may_v be_v certain_a their_o eye_n bear_v they_o witness_n but_o that_o this_o come_v from_o the_o natural_a gravity_n of_o the_o air_n he_o can_v be_v assure_v especial_o if_o they_o be_v ignorant_a what_o be_v the_o efficient_a cause_n of_o gravity_n p._n 18._o quod_fw-la vesica_fw-la etc._n etc._n that_o the_o bladder_n whether_o it_o be_v blow_v up_o with_o a_o pair_n of_o bellows_o or_o with_o the_o breath_n of_o one_o mouth_n be_v heavy_a than_o when_o it_o be_v not_o blow_v up_o i_o will_v not_o deny_v because_o of_o the_o great_a quantity_n of_o atom_n from_o the_o bellows_o or_o of_o fuliginous_a corpuseles_o that_o be_v blow_v in_o from_o the_o breath_n but_o notwithstanding_o they_o gather_v nothing_o of_o sufficient_a certainty_n from_o this_o experiment_n of_o a_o blow_a bladder_n they_o ought_v to_o have_v put_v into_o the_o scale_n two_o vessel_n of_o equal_a weight_n whereof_o one_o shall_v be_v shut_v and_o the_o other_o open_a for_o by_o this_o mean_v air_n not_o blow_v in_o but_o only_o enclose_v have_v be_v weigh_v when_o therefore_o you_o shall_v see_v air_n so_o weigh_v we_o will_v afterward_o consider_v what_o may_v be_v say_v concern_v the_o phaenomenon_n you_o bring_v p._n 19_o quod_fw-la atmosphaerae_fw-la etc._n etc._n that_o many_o particle_n both_o of_o earth_n and_o water_n mingle_v with_o the_o aethereal_a body_n be_v in_o the_o atmosphere_n i_o be_o easy_o persuade_v but_o that_o in_o the_o middle_n of_o the_o aether_n they_o shall_v move_v upward_o downward_o every_o way_n and_o that_o one_o lean_v on_o the_o back_n of_o another_o they_o shall_v not_o gravitate_fw-la be_v a_o thing_n utter_o unconceivable_a p._n 20._o aer_fw-la quo_fw-la etc._n etc._n the_o air_n with_o which_o in_o the_o begin_n the_o spherical_a glass_n be_v full_a be_v move_v by_o those_o earthy_a corpuscle_n in_o a_o simple_a circular_a motion_n and_o be_v compress_v by_o the_o force_n of_o the_o injection_n that_o of_o it_o which_o be_v pure_a penetrate_v the_o injected_a water_n get_v out_o into_o the_o open_a air_n and_o give_v place_n to_o the_o water_n it_o follow_v therefore_o that_o those_o earthy_a corpuscle_n have_v less_o place_n leave_v in_o which_o they_o can_v exercise_v their_o natural_a motion_n therefore_o beat_v one_o upon_o another_o they_o force_v the_o water_n to_o go_v out_o it_o thus_o go_v out_o the_o external_a air_n because_o the_o universe_n be_v suppose_v to_o be_v full_a penetrate_v it_o and_o successive_o take_v up_o the_o place_n of_o the_o air_n that_o go_v out_o until_o the_o corpuscle_n the_o same_o quantity_n of_o air_n be_v restore_v regain_v a_o liberty_n natural_a to_o their_o motion_n p._n 21._o quoniam_fw-la per_fw-la etc._n etc._n because_o by_o the_o draw_v back_o of_o the_o sucker_n the_o pure_a air_n be_v thrust_v in_o but_o the_o earthy_a part_n be_v not_o thrust_v in_o there_o be_v a_o great_a proportion_n of_o earthy_a particle_n which_o without_o the_o cylinder_n be_v near_o the_o sucker_n unto_o the_o pure_a air_n in_o which_o they_o exercise_v their_o motion_n as_o well_o after_o this_o revulsion_n as_o before_o wherefore_o these_o particle_n so_o move_v have_v less_o place_n to_o exercise_v their_o natural_a motion_n in_o some_o of_o they_o fall_v foul_a and_o beat_v upon_o the_o rest_n so_o that_o of_o necessity_n the_o particle_n that_o be_v near_o the_o surface_n of_o the_o sucker_n must_v drive_v it_o upward_o ibid._n vidisti_fw-la etc._n etc._n you_o see_v now_o that_o the_o spring_n of_o the_o air_n which_o they_o fuppose_v be_v either_o a_o impossible_a thing_n or_o they_o must_v for_o its_o defence_n have_v recourse_n to_o the_o hypothesis_n of_o mr._n hobbs_n p._n 23._o quia_fw-la cuticula_fw-la omnis_fw-la etc._n etc._n because_o every_o skin_n be_v make_v up_o of_o small_a thread_n or_o filament_n which_o by_o reason_n of_o their_o figure_n can_v accurate_o touch_v in_o all_o point_n the_o bladder_n therefore_o be_v a_o skin_n must_v be_v pervious_a not_o only_o to_o air_n but_o to_o water_n also_o as_o to_o sweat_v therefore_o of_o the_o air_n beat_v in_o by_o force_n there_o be_v the_o same_o compression_n within_o the_o bladder_n that_o there_o be_v without_o the_o endeavour_n of_o which_o the_o way_n of_o its_o motion_n be_v every_o way_n cross_v tend_v every_o way_n to_o the_o concave_a superficies_n of_o the_o bladder_n wherefore_o it_o be_v of_o necessity_n that_o it_o must_v swell_v every_o way_n and_o the_o vehemency_n of_o the_o endeavour_n increase_v be_v tear_v at_o last_o p._n 26._o intellexti_fw-la etc._n etc._n have_v you_o understand_v my_o hypothesis_n 1._o that_o there_o be_v with_o the_o air_n intersper_v many_o earthy_a particle_n endue_v with_o a_o simple_a circular_a motion_n congenite_fw-la to_o its_o nature_n 2._o that_o there_o be_v a_o great_a quantity_n of_o these_o particle_n in_o the_o air_n that_o be_v near_o the_o earth_n than_o in_o that_o which_o be_v more_o remote_a from_o it_o p._n 27._o neque_fw-la est_fw-la etc._n etc._n nor_o be_v there_o any_o one_o that_o hitherto_o have_v bring_v any_o reason_n why_o it_o may_v not_o be_v so_o p._n 29._o nihil_fw-la etc._n etc._n nothing_o be_v move_v but_o by_o a_o contiguous_a body_n that_o be_v in_o motion_n ibid._n dum_fw-la suctor_n etc._n etc._n while_o the_o sucker_n be_v draw_v back_o by_o how_o much_o a_o great_a place_n be_v leave_v within_o by_o so_o much_o a_o lesser_a place_n be_v leave_v to_o the_o external_a air_n which_o be_v thrust_v backward_o by_o the_o motion_n of_o the_o sucker_n towards_o the_o outmost_a part_n do_v move_v in_o like_a manner_n the_o air_n that_o be_v next_o itself_o and_o that_o air_n the_o next_o and_o so_o forward_o so_o that_o it_o be_v of_o necessity_n at_o last_o that_o the_o air_n must_v be_v compel_v into_o the_o space_n desert_v by_o the_o sucker_n and_o to_o enter_v between_o the_o convex_a and_o surface_n of_o the_o sucker_n and_o the_o concave_n of_o the_o cylinder_n for_o it_o be_v suppose_v that_o the_o part_n of_o the_o air_n be_v infinite_o subtle_a it_o be_v impossible_a but_o they_o shall_v insinuate_v themselves_o that_o way_n by_o which_o the_o sucker_n be_v draw_v down_o for_o first_o the_o contact_n of_o those_o surface_n can_v be_v perfect_a in_o all_o point_n because_o the_o surface_v themselves_o can_v be_v make_v infinite_o smooth_a then_o that_o force_n which_o be_v apply_v to_o draw_v back_o the_o sucker_n do_v distend_v in_o some_o measure_n the_o cavity_n of_o the_o cylinder_n last_o if_o in_o the_o confine_n of_o that_o be_v betwixt_o the_o two_o surface_n any_o one_o single_a hard_a atom_n shall_v enter_v pure_a air_n will_v enter_v at_o the_o same_o way_n although_o with_o a_o weak_a endeavour_n i_o may_v also_o have_v account_v that_o air_n which_o for_o the_o same_o cause_n insinuate_v itself_o through_o the_o valve_n of_o the_o cylinder_n you_o see_v therefore_o the_o consequence_n from_o the_o retraction_n of_o the_o sucker_n to_o the_o be_v of_o a_o empty_a place_n be_v take_v away_o it_o will_v follow_v also_o that_o the_o air_n which_o be_v drive_v up_o into_o the_o place_n desert_v by_o the_o sucker_n because_o it_o be_v drive_v up_o thither_o by_o a_o great_a force_n be_v move_v with_o a_o very_a swift_a and_o circular_a motion_n betwixt_o the_o top_n and_o the_o bottom_n in_o the_o cylinder_n because_o there_o be_v nothing_o there_o that_o can_v weaken_v its_o motion_n and_o you_o know_v that_o there_o be_v nothing_o that_o can_v give_v motion_n to_o its_o own_o self_n or_o diminish_v it_o p._n 39_o haerent_fw-la hic_fw-la etc._n
drive_v out_o into_o the_o open_a air._n and_o thus_o by_o the_o repetition_n of_o the_o motion_n of_o the_o sucker_n upward_o and_o downward_o and_o by_o opportune_o turn_v the_o key_n and_o stop_v the_o valve_n as_o occasion_n require_v more_o or_o less_o air_n may_v be_v suck_v out_o of_o the_o receiver_n according_a to_o the_o exigency_n of_o the_o experiment_n and_o the_o intention_n of_o he_o that_o make_v it_o your_o lordship_n will_v perhaps_o think_v that_o i_o have_v be_v unnecessary_o prolix_a in_o this_o first_o part_n of_o my_o discourse_n but_o if_o you_o have_v see_v how_o many_o unexpected_a difficulty_n we_o find_v to_o keep_v out_o the_o external_a air_n even_o for_o a_o little_a while_n when_o some_o considerable_a part_n of_o the_o internal_a have_v be_v suck_v out_o you_o will_v peradventure_o allow_v that_o i_o may_v have_v set_v down_o more_o circumstance_n than_o i_o have_v without_o set_v down_o any_o who_o knowledge_n he_o that_o shall_v try_v the_o experiment_n may_v not_o have_v need_n of_o which_o be_v so_o true_a that_o before_o we_o proceed_v any_o further_a i_o can_v think_v it_o unseasonable_a to_o advertise_v your_o lordship_n that_o there_o be_v two_o chief_a sort_n of_o experiment_n which_o we_o design_v in_o our_o engine_n to_o make_v trial_n of_o the_o one_o such_o as_o may_v be_v quick_o dispatch_v and_o therefore_o may_v be_v try_v in_o our_o engine_n though_o it_o leak_v a_o little_a because_o the_o air_n may_v be_v fast_o draw_v out_o by_o nimble_o ply_v the_o pump_n than_o it_o can_v get_v in_o at_o undiscerned_a leak_n i_o say_v at_o undiscerned_a leak_n because_o such_o as_o be_v big_a enough_o to_o be_v discover_v can_v scarce_o be_v uneasy_a to_o be_v stop_v the_o other_o sort_n of_o experiment_n consist_v of_o those_o that_o require_v not_o only_o that_o the_o internal_a air_n be_v draw_v out_o of_o the_o receiver_n but_o that_o it_o be_v likewise_o for_o a_o long_a time_n keep_v out_o of_o it_o such_o be_v the_o preservation_n of_o animal_n and_o other_o body_n therein_o the_o germination_n and_o growth_n of_o vegetable_n and_o other_o trial_n of_o several_a sort_n which_o it_o be_v apparent_a can_v be_v well_o make_v unless_o the_o external_a air_n can_v for_o a_o competent_a while_n be_v exclude_v since_o even_o at_o a_o very_a small_a leak_n there_o may_v enough_o get_v in_o to_o make_v the_o vacuum_n soon_o lose_v that_o name_n by_o which_o i_o here_o declare_v once_o for_o all_o that_o i_o understand_v not_o a_o space_n wherein_o there_o be_v no_o body_n at_o all_o but_o such_o as_o be_v either_o altogether_o or_o almost_o total_o devoid_a of_o air._n now_o this_o distinction_n of_o experiment_n i_o think_v fit_a to_o premise_v to_o the_o ensue_a narrative_n because_o upon_o trial_n we_o find_v it_o so_o exceed_v and_o scarce_o imaginable_o difficult_a a_o matter_n to_o keep_v out_o the_o air_n from_o get_v at_o all_o in_o at_o any_o imperceptible_a hole_n or_o flaw_n whatsoever_o in_o a_o vessel_n immediate_o surround_v with_o the_o compress_a atmosphere_n that_o in_o spite_n of_o all_o our_o care_n and_o diligence_n we_o never_o be_v able_a total_o to_o exhaust_v the_o receiver_n or_o keep_v it_o when_o it_o be_v almost_o empty_a any_o considerable_a time_n from_o leak_a more_o or_o less_o although_o as_o we_o have_v late_o intimate_v by_o unwearied_a quickness_n in_o ply_v the_o pump_n the_o internal_a air_n can_v be_v much_o fast_o draw_v out_o than_o the_o external_a can_v get_v in_o till_o the_o receiver_n come_v to_o be_v almost_o quite_o empty_a and_o that_o be_v enough_o to_o enable_v man_n to_o discover_v hitherto_o unobserved_a phaenomena_n of_o nature_n the_o experiment_n therefore_o of_o the_o first_o sort_n will_n i_o fear_v prove_v the_o only_a one_o wherewith_o my_o avocation_n will_v allow_v i_o to_o entertain_v your_o lordship_n in_o this_o letter_n for_o till_o your_o further_a command_n shall_v engage_v i_o to_o undertake_v by_o god_n permission_n such_o a_o employment_n and_o more_o leisure_n shall_v better_o fit_v i_o for_o it_o i_o know_v not_o whether_o i_o shall_v be_v in_o a_o condition_n to_o try_v what_o may_v be_v do_v to_o enable_v i_o to_o give_v you_o some_o account_n of_o the_o other_o sort_n of_o experiment_n also_o experiment_n i._n to_o proceed_v now_o to_o the_o phaenomena_n exhibit_v to_o we_o by_o the_o engine_n above_o describe_v i_o hold_v it_o not_o unfit_a to_o begin_v with_o what_o do_v constant_o and_o regular_o offer_v itself_o to_o our_o observation_n as_o depend_v upon_o the_o fabric_n of_o the_o engine_n itself_o and_o not_o upon_o the_o nature_n of_o this_o or_o that_o particular_a experiment_n which_o it_o be_v employ_v to_o try_v first_o then_o upon_o the_o draw_v down_o of_o the_o sucker_n the_o valve_n be_v shut_v the_o cylindrical_a space_n desert_v by_o the_o sucker_n be_v leave_v devoid_a of_o air_n and_o therefore_o upon_o the_o turn_n of_o the_o key_n the_o air_n contain_v in_o the_o receiver_n rush_v into_o the_o empty_v cylinder_n till_o the_o air_n in_o both_o those_o vessel_n be_v bring_v to_o about_o a_o equal_a measure_n of_o dilatation_n and_o therefore_o upon_o shut_v the_o receiver_n by_o re-turning_a the_o key_n if_o you_o open_v the_o valve_n and_o force_v up_o the_o sucker_n again_o you_o will_v find_v that_o after_o this_o first_o exsuction_n you_o will_v drive_v out_o almost_o a_o whole_a cylinder_n full_a of_o air_n but_o at_o the_o follow_a exsuction_n you_o will_v draw_v less_o and_o less_o of_o air_n out_o of_o the_o receiver_n into_o the_o cylinder_n because_o there_o will_v still_o remain_v less_o and_o less_o air_n in_o the_o receiver_n itself_o and_o consequent_o the_o particle_n of_o the_o remain_a air_n have_v more_o room_n to_o extend_v themselves_o in_o will_v less_o press_v out_o one_o another_o this_o you_o will_v easy_o perceive_v by_o find_v that_o you_o still_o force_v less_o and_o less_o air_n out_o of_o the_o cylinder_n so_o that_o when_o the_o receiver_n be_v almost_o exhaust_v you_o may_v force_v up_o the_o sucker_n almost_o to_o the_o top_n of_o the_o cylinder_n before_o you_o will_v need_v to_o unstop_v the_o valve_n to_o let_v out_o any_o air_n and_o if_o at_o such_o time_n the_o valve_n be_v shut_v you_o let_v go_v the_o handle_n of_o the_o pump_n you_o will_v find_v the_o sucker_n forcible_o carry_v up_o to_o the_o top_n of_o the_o cylinder_n by_o the_o protrusion_n of_o the_o external_a air_n which_o be_v much_o less_o rarify_v than_o that_o within_o the_o cylinder_n must_v have_v a_o more_o forcible_a pressure_n upon_o the_o sucker_n than_o the_o internal_a be_v able_a to_o resist_v and_o by_o this_o mean_v you_o may_v know_v how_o far_o you_o have_v empty_v the_o receiver_n and_o to_o this_o we_o may_v add_v on_o this_o occasion_n that_o constant_o upon_o the_o turn_n of_o the_o key_n to_o let_v out_o the_o air_n from_o the_o receiver_n into_o the_o empty_v cylinder_n there_o be_v immediate_o produce_v a_o considerable_o brisk_a noise_n especial_o whilst_o there_o be_v any_o plenty_n of_o air_n in_o the_o receiver_n for_o the_o more_o easy_a understanding_n of_o the_o experiment_n triable_a by_o our_o engine_n i_o think_v it_o not_o superfluous_a nor_o unseasonable_a in_o the_o recital_n of_o this_o first_o of_o they_o to_o insinuate_v that_o notion_n by_o which_o it_o seem_v likely_a that_o most_o if_o not_o all_o of_o they_o will_v prove_v explicable_a your_o lordship_n will_v easy_o suppose_v that_o the_o notion_n i_o speak_v of_o be_v that_o there_o be_v a_o spring_n or_o elastical_a power_n in_o the_o air_n we_o live_v in_o by_o which_o 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d or_o spring_n of_o the_o air_n that_o which_o i_o mean_v be_v this_o that_o our_o air_n either_o consist_v of_o or_o at_o least_o abound_v with_o part_n of_o such_o a_o nature_n that_o in_o case_n they_o be_v bend_v or_o compress_v by_o the_o weight_n of_o the_o incumbent_a part_n of_o the_o atmosphere_n or_o by_o any_o other_o body_n they_o do_v endeavour_v as_o much_o as_o in_o they_o lie_v to_o free_v themselves_o from_o that_o pressure_n by_o bear_v against_o the_o contiguous_a body_n that_o keep_v they_o bend_v and_o as_o soon_o as_o those_o body_n be_v remove_v or_o reduce_v to_o give_v they_o way_n by_o present_o unbending_a and_o stretch_v out_o themselves_o either_o quite_o or_o so_o far_o forth_o as_o the_o contiguous_a body_n that_o resist_v they_o will_v permit_v and_o thereby_o expand_v the_o whole_a parcel_n of_o air_n these_o elastical_a body_n compose_v this_o notion_n may_v perhaps_o be_v somewhat_o further_o explain_v by_o conceive_v the_o air_n near_o the_o earth_n to_o be_v such_o a_o heap_n of_o little_a body_n lie_v one_o upon_o another_o as_o may_v be_v resemble_v to_o a_o fleece_n of_o wool_n for_o
this_o to_o omit_v other_o likeness_n betwixt_o they_o consist_v of_o many_o slender_a and_o flexible_a hair_n each_o of_o which_o may_v indeed_o like_o a_o little_a spring_n be_v easy_o bend_v or_o roll_v up_o but_o will_v also_o like_o a_o spring_n be_v still_o endeavour_v to_o stretch_v itself_o out_o again_o for_o though_o both_o these_o hair_n and_o the_o aereal_a corpuscle_n to_o which_o we_o liken_v they_o do_v easy_o yield_v to_o external_a pressure_n yet_o each_o of_o they_o by_o virtue_n of_o its_o structure_n be_v endow_v with_o a_o power_n or_o principle_n of_o self-dilatation_n by_o virtue_n where_o of_o though_o the_o hair_n may_v by_o a_o man_n hand_n be_v bend_v and_o crowd_v close_o together_o and_o into_o a_o narrow_a room_n than_o suit_v best_a with_o the_o nature_n of_o the_o body_n yet_o whilst_o the_o compression_n last_v there_o be_v in_o the_o fleece_n they_o compose_v a_o endeavour_n outward_o where_o by_o it_o continual_o thrust_v against_o the_o hand_n that_o oppose_v its_o expansion_n and_o upon_o the_o removal_n of_o the_o external_a pressure_n by_o open_v the_o hand_n more_o or_o less_o the_o compress_a wool_n do_v as_o it_o be_v spontaneous_o expand_v or_o display_v itself_o towards_o the_o recovery_n of_o its_o former_a more_o loose_a and_o free_a condition_n till_o the_o fleece_n have_v either_o regain_v its_o former_a dimension_n or_o at_o least_o approach_v they_o as_o near_o as_o the_o compress_a hand_n perchance_o not_o quite_o open_v will_v permit_v this_o power_n of_o self-dilatation_n be_v somewhat_o more_o conspicuous_a in_o a_o dry_a sponge_n compress_v than_o in_o a_o fleece_n of_o wool_n but_o yet_o we_o rather_o choose_v to_o employ_v the_o latter_a on_o this_o occasion_n because_o it_o be_v not_o like_o a_o sponge_n a_o entire_a body_n but_o a_o number_n of_o slender_a and_o flexible_a body_n loose_o complicate_v as_o the_o air_n itself_o seem_v to_o be_v there_o be_v yet_o another_o way_n to_o explicate_v the_o spring_n of_o the_o air_n namely_o by_o suppose_v with_o that_o most_o ingenious_a gentleman_n mounseur_fw-fr des_fw-mi cartes_n that_o the_o air_n be_v nothing_o but_o a_o congery_n or_o heap_n of_o small_a and_o for_o the_o most_o part_n of_o flexible_a particle_n of_o several_a size_n and_o of_o all_o kind_n of_o figure_n which_o be_v raise_v by_o heat_n especial_o that_o of_o the_o sun_n into_o that_o fluid_a and_o subtle_a ethereal_a body_n that_o surround_v the_o earth_n and_o by_o the_o restless_a agitation_n of_o that_o celestial_a matter_n wherein_o those_o particle_n swim_v be_v so_o whirl_v round_o that_o each_o corpuscle_n endeavour_v to_o beat_v off_o all_o other_o from_o come_v within_o the_o little_a sphere_n requisite_a to_o its_o motion_n about_o its_o own_o centre_n and_o in_o case_n any_o by_o intrude_a into_o that_o sphere_n shall_v oppose_v its_o free_a rotation_n to_o expel_v or_o drive_v it_o away_o so_o that_o according_a to_o this_o doctrine_n it_o import_v very_o little_a whether_o the_o particle_n of_o the_o air_n have_v the_o structure_n requisite_a to_o spring_n or_o be_v of_o any_o other_o form_n how_o irregular_a soever_o since_o their_o elastical_a power_n be_v not_o make_v to_o depend_v upon_o their_o shape_n or_o structure_n but_o upon_o the_o vehement_a agitation_n and_o as_o it_o be_v brandish_v motion_n which_o they_o receive_v from_o the_o fluid_fw-la ether_n that_o swift_o flow_v between_o they_o and_o whirl_v about_o each_o of_o they_o independent_o from_o the_o rest_n not_o only_o keep_v those_o slender_a aëreal_a body_n separate_v and_o stretch_v out_o at_o least_o as_o far_o as_o the_o neighbour_a one_o will_v permit_v which_o otherwise_o by_o reason_n of_o their_o flexibleness_n and_o weight_n will_v flag_n or_o curl_n but_o also_o make_v they_o hit_v against_o and_o knock_v away_o each_o other_o and_o consequent_o require_v more_o room_n than_o that_o which_o if_o they_o be_v compress_v they_o will_v take_v up_o by_o these_o two_o differ_v way_n my_o lord_n may_v the_o spring_n of_o the_o air_n be_v explicate_v but_o though_o the_o former_a of_o they_o be_v that_o which_o by_o reason_n of_o its_o seem_n somewhat_o more_o easy_a i_o shall_v for_o the_o most_o part_n make_v use_n of_o in_o the_o follow_a discourse_n yet_o be_o i_o not_o willing_a to_o declare_v peremptory_o for_o either_o of_o they_o against_o the_o other_o and_o indeed_o though_o i_o have_v in_o another_o treatise_n endeavour_v to_o make_v it_o probable_a that_o the_o return_v of_o elastical_a body_n if_o i_o may_v so_o call_v they_o forcible_o bend_v to_o their_o former_a position_n may_v be_v mechanical_o explicate_v yet_o i_o must_v confess_v that_o to_o determine_v whether_o the_o motion_n of_o restitution_n in_o body_n proceed_v from_o this_o that_o the_o part_n of_o a_o body_n of_o a_o peculiar_a structure_n be_v put_v into_o motion_n by_o the_o bend_n of_o the_o spring_n or_o from_o the_o endeavour_n of_o some_o subtle_a ambient_fw-la body_n who_o passage_n may_v be_v oppose_v or_o obstruct_v or_o else_o it_o be_v pressure_n unequal_o resist_v by_o reason_n of_o the_o new_a shape_n or_o magnitude_n which_o the_o bend_n of_o a_o spring_n may_v give_v the_o pore_n of_o it_o to_o determine_v this_o i_o say_v seem_v to_o i_o a_o matter_n of_o more_o difficulty_n than_o at_o first_o sight_n one_o will_v easy_o imagine_v it_o wherefore_o i_o shall_v decline_v meddle_v with_o a_o subject_a which_o be_v much_o more_o hard_a to_o be_v explicate_v than_o necessary_a to_o be_v so_o by_o he_o who_o business_n it_o be_v not_o in_o this_o letter_n to_o assign_v the_o adequate_a cause_n of_o the_o spring_n of_o the_o air_n but_o only_o to_o manifest_v that_o the_o air_n have_v a_o spring_n and_o to_o relate_v some_o of_o its_o effect_n i_o know_v not_o whether_o i_o need_v annex_v that_o though_o either_o of_o the_o abovementioned_a hypothesis_n and_o perhaps_o some_o other_o may_v afford_v we_o a_o account_n 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admovens_fw-la cum_fw-la luctatus_fw-la diu_fw-la haerentem_fw-la non_fw-la removisset_fw-la excusavit_fw-la impotentiam_fw-la objecta_fw-la peregrini_fw-la &_o potentissimi_fw-la glutinis_fw-la interpositione_n quo_fw-la fortissime_fw-la copulante_fw-la nequiret_fw-la divelli_fw-la donec_fw-la vidit_fw-la ab_fw-la alio_fw-la per_fw-la tabulam_fw-la facilimè_fw-la laminam_fw-la deduci_fw-la &_o ad_fw-la extrema_fw-la productam_fw-la &_o actam_fw-la in_o transversum_fw-la inde_fw-la deportari_fw-la but_o that_o we_o may_v learn_v from_o our_o own_o engine_n that_o two_o body_n though_o they_o touch_v each_o other_o but_o in_o a_o small_a part_n of_o their_o surface_n may_v be_v make_v to_o cohere_v very_o strong_o only_o by_o this_o that_o the_o air_n press_v much_o more_o forcible_o upon_o the_o inferior_a superficies_n of_o the_o lowermost_a body_n than_o upon_o the_o upper_a surface_n of_o the_o same_o we_o will_v hereunto_o annex_v the_o follow_a experiment_n though_o out_o of_o the_o order_n wherein_o they_o be_v make_v experiment_n xxxii_o i_o remember_v i_o have_v in_o a_o discourse_n touch_v fluidity_n and_o firmness_n make_v mention_n of_o my_o have_v by_o the_o exsuction_n of_o the_o air_n out_o of_o a_o glass_n vessel_n make_v that_o vessel_n take_v up_o or_o suck_v up_o to_o speak_v in_o the_o common_a language_n a_o body_n weigh_v divers_a ounce_n but_o our_o engine_n afford_v we_o the_o opportunity_n of_o make_v considerable_a experiment_n of_o that_o kind_n we_o think_v fit_a to_o make_v a_o further_a trial_n of_o the_o force_n of_o the_o atmosphere_n pressure_n upward_o after_o the_o follow_a manner_n the_o receiver_n have_v be_v exquisite_o close_v as_o we_o have_v often_o teach_v already_o and_o the_o air_n be_v in_o a_o good_a measure_n draw_v out_o of_o it_o it_o be_v remove_v from_o off_o the_o pump_n and_o to_o the_o low_a branch_n of_o the_o stop-cock_n there_o be_v speedy_o apply_v a_o taper_a valve_n of_o brass_n such_o as_o be_v describe_v in_o the_o 9th_o figure_n make_v fit_a to_o go_v with_o its_o narrow_a end_n into_o the_o cavity_n of_o the_o branch_n and_o to_o fill_v the_o orifice_n of_o that_o cavity_n with_o its_o broad_a part_n and_o that_o the_o air_n may_v not_o get_v in_o at_o the_o little_a interval_n leave_v here_o and_o there_o between_o the_o convex_a surface_n of_o the_o stopple_n and_o the_o internal_a edge_n of_o the_o branch_n those_o interval_n be_v stop_v with_o a_o little_a diachylon_n and_o to_o the_o door_n or_o if_o you_o please_v that_o part_n of_o the_o valve_n which_o be_v to_o move_v to_o and_o fro_o and_o in_o this_o experiment_n hang_v perpendicular_a to_o the_o horizon_n there_o be_v at_o a_o button_n of_o brass_n belong_v to_o the_o valve_n fasten_v a_o broad_a scale_n wherein_o weight_n be_v to_o be_v put_v this_o do_v the_o key_n of_o the_o stop-cock_n be_v turn_v and_o the_o external_a air_n beat_v like_o a_o forcible_a stream_n upon_o the_o valve_n to_o get_v in_o there_o it_o do_v sudden_o both_o shut_v the_o valve_n and_o keep_v it_o shut_v so_o strong_o that_o we_o have_v time_n to_o cast_v in_o divers_a weight_n one_o after_o another_o into_o the_o scale_n till_o at_o length_n the_o weight_n overpower_v the_o pressure_n of_o the_o atmosphere_n draw_v down_o the_o valve_n by_o the_o string_n that_o tie_v the_o scale_n to_o it_o and_o give_v liberty_n to_o the_o outward_a air_n to_o rush_v into_o the_o receiver_n though_o another_o time_n when_o the_o valve_n have_v but_o little_a weight_n hang_v at_o it_o be_v by_z i_o know_v not_o what_o accident_n draw_v down_o beneath_o its_o former_a place_n it_o be_v by_o the_o impetuous_a current_n of_o the_o outward_a air_n sudden_o impel_v up_o into_o it_o again_o and_o keep_v there_o but_o in_o the_o former_a experiment_n it_o be_v remarkable_a that_o though_o the_o receiver_n be_v not_o well_o exhaust_v and_o though_o it_o leak_v whilst_o the_o rest_n of_o the_o experiment_n be_v in_o prosecution_n and_o though_o the_o valve_n whereon_o the_o cylinder_n of_o the_o atmosphere_n can_v press_v be_v not_o above_o a_o inch_n and_o a_o half_a in_o diameter_n yet_o the_o weight_n keep_v up_o by_o suction_n or_o rather_o support_v by_o the_o air_n namely_o the_o valve_n the_o scale_n and_o what_o be_v cast_v out_o of_o it_o be_v send_v to_o be_v weigh_v amount_v to_o about_o ten_o of_o our_o common_a pound_n consist_v of_o sixteen_o ounce_n a_o piece_n so_o that_o we_o doubt_v not_o but_o that_o have_v the_o experiment_n be_v make_v with_o favourable_a circumstance_n the_o air_n endeavour_v to_o press_v in_o at_o the_o orifice_n of_o the_o stop-cock_n will_v have_v keep_v a_o very_a much_o great_a weight_n from_o fall_v out_o of_o it_o i_o say_v the_o air_n because_o we_o find_v by_o trial_n purposely_o make_v that_o neither_o the_o imperfect_a contact_n of_o the_o valve_n and_o the_o stop-cock_n nor_o the_o diachylon_n that_o be_v employ_v to_o fill_v up_o the_o little_a cranny_n leave_v betwixt_o they_o be_v considerable_a in_o this_o experiment_n by_o which_o it_o may_v among_o other_o thing_n appear_v that_o i_o do_v not_o without_o cause_n in_o the_o abovenamed_a discourse_v touch_v fluidity_n and_o firmness_n ascribe_v a_o great_a force_n even_o to_o such_o pillar_n of_o air_n as_o may_v be_v suppose_v to_o begin_v at_o the_o top_n of_o the_o atmosphere_n and_o recoil_v from_o the_o ground_n to_o terminate_v on_o the_o body_n on_o which_o they_o press_v since_o in_o the_o present_a experiment_n such_o a_o weight_n be_v support_v by_o so_o slender_a a_o cylinder_n of_o air_n rebound_v from_o the_o earth_n to_o the_o valve_n whereon_o it_o do_v bear_v experiment_n xxxiii_o but_o in_o regard_n we_o have_v not_o yet_o be_v able_a to_o empty_v so_o great_a a_o vessel_n as_o our_o receiver_n so_o well_o as_o we_o can_v the_o cylinder_n itself_o our_o pump_n alone_o may_v afford_v we_o a_o noble_a instance_n of_o the_o force_n of_o the_o air_n we_o live_v in_o insomuch_o 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the_o air_n against_o its_o descent_n the_o sucker_n must_v be_v again_o force_v to_o the_o top_n of_o the_o cylinder_n who_o upper_a orifice_n must_v now_o be_v exact_o close_v and_o then_o the_o first_o weight_n remain_v we_o easy_o may_v by_o hang_v a_o scale_n to_o the_o abovementioned_a iron_n that_o make_v part_n of_o the_o sucker_n cast_v in_o know_a weight_n so_o long_o till_o in_o spite_n of_o the_o reluctancy_n of_o the_o atmosphere_n the_o sucker_n be_v draw_v down_o for_o to_o these_o weight_n in_o the_o scale_n that_o of_o the_o scale_n itself_o be_v add_v the_o sum_n will_v give_v we_o the_o weight_n of_o a_o column_n of_o air_n equal_a in_o diameter_n to_o the_o sucker_n or_o to_o the_o cavity_n of_o the_o cylinder_n and_o in_o length_n to_o the_o height_n of_o the_o atmosphere_n according_a to_o this_o method_n we_o do_v since_o the_o write_n of_o the_o last_o experiment_n attempt_v to_o measure_v the_o pressure_n of_o the_o atmosphere_n but_o find_v it_o more_o difficult_a than_o we_o expect_v to_o persorm_v it_o with_o any_o accurateness_n for_o though_o by_o the_o help_n of_o the_o manubrium_fw-la the_o sucker_n move_v up_o and_o down_o with_o so_o much_o ease_n that_o one_o will_v have_v think_v that_o both_o its_o convex_a surface_n and_o the_o concave_a one_o of_o the_o cylinder_n be_v exquisite_o smooth_a and_o as_o it_o be_v slippery_a yet_o when_o the_o sucker_n come_v to_o be_v move_v only_o with_o a_o dead_a weight_n or_o pressure_n that_o be_v not_o like_o the_o force_n of_o he_o that_o pump_v intend_v as_o occasion_v require_v we_o find_v that_o the_o little_a rufness_n or_o other_o inequality_n and_o perhaps_o too_o the_o unequal_a pressure_n of_o the_o leather_n against_o the_o cavity_n of_o the_o cylinder_n be_v able_a now_o and_o then_o to_o put_v a_o stop_n to_o the_o descent_n or_o ascent_n of_o the_o sucker_n though_o a_o
doctrine_n which_o he_o reject_v he_o give_v it_o we_o in_o these_o word_n hoc_fw-la quoque_fw-la experimentum_fw-la principiis_fw-la nostris_fw-la optimè_fw-la convenit_fw-la cum_fw-la enim_fw-la per_fw-la illam_fw-la emboli_n depressionem_fw-la aër_fw-la in_o cavitate_fw-la brachii_fw-la inclusus_fw-la separetur_fw-la ab_fw-la eodem_fw-la brachio_n descendatque_fw-la simul_fw-la cum_fw-la embolo_fw-la uti_fw-la de_fw-fr aqua_fw-la simul_fw-la cum_fw-la argento_fw-la vivo_fw-la descendente_fw-la capite_fw-la decimo_fw-la tertio_fw-la vidimus_fw-la fit_n ut_fw-la in_o tota_fw-la illa_fw-la depressione_n novae_fw-la semper_fw-la ab_fw-la aëre_fw-la illo_fw-la descendente_fw-la superficies_n deripiantur_fw-la simul_fw-la &_o extendantur_fw-la ut_fw-la ibidem_fw-la de_fw-la aqua_fw-la est_fw-la explicatum_fw-la cum_fw-la itaque_fw-la aeque_fw-la facile_fw-la diripiantur_fw-la &_o extendantur_fw-la hujusmodi_fw-la superficies_n in_o fine_a depressionis_fw-la ac_fw-la initio_fw-la mirum_fw-la non_fw-la est_fw-la quod_fw-la eadem_fw-la utrobique_fw-la sentiatur_fw-la deprimendi_fw-la difficultas_fw-la by_o which_o though_o he_o seem_v to_o intend_v a_o opposition_n to_o that_o part_n of_o the_o three_o experiment_n which_o i_o oppose_v not_o against_o his_o opinion_n but_o that_o of_o some_o learned_a vacuist_n yet_o not_o to_o mention_v that_o he_o seem_v to_o have_v somewhat_o mistake_v my_o sense_n he_o offer_v nothing_o at_o all_o to_o invalidate_v my_o inference_n against_o they_o but_o instead_o of_o that_o propose_v a_o defence_n of_o his_o own_o opinion_n which_o suppose_v the_o truth_n of_o his_o disprove_v hypothesis_n and_o be_v either_o unsatisfactory_a even_o according_a to_o that_o or_o else_o disagree_v with_o what_o himself_o have_v teach_v we_o but_o a_o little_a before_o for_o it_o be_v evident_a that_o the_o more_o the_o sucker_n be_v depress_v the_o more_o the_o cylinder_n be_v exhaust_v of_o air._n and_o in_o his_o three_o corollary_n which_o we_o late_o desire_v the_o reader_n to_o observe_v speak_v of_o the_o air_n in_o the_o receiver_n and_o the_o case_n be_v the_o same_o with_o the_o air_n in_o the_o cylinder_n he_o affirm_v more_o than_o once_o eo_fw-la magis_fw-la extendi_fw-la ac_fw-la rarefieri_fw-la aërem_fw-la relictum_fw-la quo_fw-la plus_fw-la inde_fw-la exhauritur_fw-la majoremque_fw-la proinde_fw-la acquirere_fw-la vim_o seize_v contrahendi_fw-la whereas_o here_o he_o will_v have_v we_o believe_v that_o the_o little_a internal_a air_n that_o be_v in_o the_o cavity_n of_o the_o shank_n of_o the_o stop-cock_n do_v as_o strong_o retract_v the_o sucker_n or_o which_o in_o our_o case_n be_v all_o one_o resist_v its_o depression_n when_o the_o sucker_n be_v yet_o near_o the_o top_n of_o the_o cylinder_n and_o consequent_o when_o the_o include_v air_n be_v but_o a_o little_a dilate_a as_o when_o the_o same_o sucker_n be_v force_v down_o to_o the_o low_a part_n of_o the_o cylinder_n the_o same_o portion_n of_o remain_a air_n must_v be_v exceed_o more_a distend_v the_o 4._o experiment_n in_o the_o four_o experiment_n touch_v the_o swell_n of_o a_o bladder_n upon_o the_o removal_n of_o the_o ambient_fw-la air_n and_o proportionable_o to_o that_o removal_n our_o author_n object_n nothing_o against_o the_o explication_n we_o give_v of_o it_o by_o the_o spring_n of_o the_o air_n include_v in_o the_o bladder_n and_o distend_v it_o according_a as_o the_o pressure_n of_o the_o ambient_fw-la air_n be_v weaken_v but_o he_o endeavour_v also_o to_o explicate_v it_o his_o way_n to_o which_o he_o say_v this_o circumstance_n do_v excellent_o agree_v that_o upon_o the_o regress_n of_o the_o external_a air_n into_o the_o receiver_n the_o tumid_a bladder_n immediate_o shrink_v because_o say_v he_o by_o such_o ingress_n of_o the_o external_a air_n the_o air_n in_o the_o receiver_n which_o draw_v the_o side_n of_o the_o bladder_n outward_a from_o the_o middle_n of_o it_o be_v relax_v which_o explication_n whether_o it_o be_v more_o natural_a than_o we_o that_o ascribe_v the_o shrink_n of_o the_o bladder_n to_o the_o pressure_n of_o the_o air_n that_o be_v let_v into_o the_o receiver_n let_v the_o reader_n judge_n who_o have_v consider_v what_o we_o have_v former_o object_v against_o the_o examiner_n funiculus_fw-la and_o the_o relaxation_n of_o it_o upon_o the_o admission_n of_o air._n as_o for_o the_o reason_n likewise_o he_o add_v why_o a_o perforated_a bladder_n do_v not_o also_o swell_v namely_o that_o by_o the_o hole_n how_o little_a soever_o the_o include_v air_n be_v suck_v out_o by_o the_o rarefy_a ambient_fw-la we_o leave_v it_o to_o the_o impartial_a reader_n to_o consider_v whether_o be_v the_o more_o genuine_a explication_n either_o we_o against_o which_o he_o have_v nothing_o to_o object_n or_o he_o which_o to_o make_v clear_o out_o he_o ought_v according_a to_o what_o we_o former_o note_v dispute_v against_o his_o funiculus_fw-la to_o show_v we_o what_o kind_n of_o string_n they_o be_v which_o though_o according_a to_o he_o strong_o fasten_v to_o the_o inside_n of_o the_o receiver_n and_o the_o superficies_n of_o the_o bladder_n must_v draw_v just_a as_o forcible_o one_o as_o another_o how_o long_o soever_o they_o be_v without_o the_o bladder_n in_o comparison_n of_o those_o that_o within_o the_o bladder_n draw_v so_o as_o to_o hinder_v the_o diduction_n of_o its_o side_n for_o experience_n show_v that_o in_o a_o perforated_a bladder_n the_o wrinkle_n continue_v as_o if_o there_o be_v no_o draw_v at_o all_o and_o though_o he_o can_v describe_v how_o such_o a_o string_n may_v be_v context_n yet_o our_o explication_n will_v have_v this_o advantage_n in_o point_n of_o probability_n above_o he_o that_o whereas_o he_o deny_v not_o that_o the_o air_n have_v spring_n and_o weight_n as_o we_o deny_v his_o funiculus_fw-la to_o have_v any_o other_o than_o a_o imaginary_a existence_n and_o whereas_o he_o acknowledge_v that_o by_o the_o instrument_n the_o 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the_o 5._o experiment_n against_o the_o cause_n we_o assign_v of_o the_o five_o experiment_n he_o likewise_o object_n nothing_o but_o only_o ascribe_v the_o break_n of_o the_o bladder_n to_o the_o self-contraction_n of_o the_o rarefy_a air_n in_o the_o receiver_n and_o therefore_o refer_v the_o reader_n to_o what_o we_o have_v new_o say_v about_o the_o last_o experiment_n we_o will_v with_o our_o author_n pass_v over_o the_o six_o and_o seven_o to_o which_o he_o have_v no_o quarrel_n and_o proceed_v to_o the_o eight_o the_o 8._o experiment_n this_o be_v that_o wherein_o we_o mention_v our_o have_v break_v a_o glass-receiver_n which_o be_v not_o globular_a by_o the_o exhaustion_n of_o most_o of_o the_o inward_a air_n whereby_o its_o debilitate_a pressure_n become_v unable_a to_o resist_v the_o unweaken_a pressure_n of_o the_o outward_a air._n but_o this_o explication_n the_o examiner_n confident_o reject_v in_o these_o word_n at_o profect_a non_fw-la videtur_fw-la credibile_fw-la mollissimum_fw-la hunc_fw-la aërem_fw-la tam_fw-la uchementer_fw-la vitrum_fw-la tantae_fw-la praesertim_fw-la crassitudinis_fw-la quantae_fw-la ibidem_fw-la dicitur_fw-la undique_fw-la sic_fw-la comprimere_fw-la ut_fw-la illud_fw-la perfringat_fw-la as_o if_o it_o be_v more_o credible_a that_o the_o little_a air_n within_o which_o according_a to_o he_o be_v so_o much_o thin_a than_o common_a air_n shall_v be_v able_a to_o act_v more_o powerful_o upon_o the_o glass_n than_o the_o air_n without_o which_o himself_o confess_v to_o be_v a_o heavy_a body_n and_o which_o not_o only_o reach_v from_o the_o surface_n of_o the_o earth_n to_o the_o top_n of_o the_o high_a mountain_n but_o which_o as_o may_v not_o improbable_o be_v argue_v from_o what_o we_o have_v elsewhere_o deliver_v may_v for_o aught_o we_o know_v to_o the_o contrary_a be_v heap_v upon_o the_o receiver_n to_o the_o height_n of_o some_o hundred_o of_o miles_n nay_o to_o i_o know_v not_o how_o many_o thousand_o in_o case_n the_o atmosphere_n 5._o be_v not_o a_o bound_a portion_n of_o the_o air_n but_o reach_v as_o high_a as_o it._n as_o for_o the_o explication_n he_o substitute_n in_o these_o word_n verius_fw-la itaque_fw-la respondetur_fw-la ideo_fw-la sic_fw-la fractum_fw-la esse_fw-la illud_fw-la
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order_n to_o our_o present_a design_n be_v the_o difference_n in_o weight_n betwixt_o water_n and_o quicksilver_n and_o though_o this_o have_v be_v define_v already_o by_o the_o illustrious_a verulam_n and_o some_o other_o inquisitive_a person_n that_o have_v compare_v the_o weight_n of_o several_a body_n and_o cast_v their_o observation_n into_o table_n yet_o we_o shall_v not_o scruple_n to_o annex_v our_o own_o trial_n about_o it_o partly_o because_o we_o find_v author_n considerable_o to_o disagree_v partly_o because_o we_o use_v exacter_n scales_n and_o a_o somewhat_o more_o wary_a method_n than_o other_o seem_v to_o have_v do_v and_o partly_o also_o because_o have_v prosecute_v our_o inquiry_n by_o two_o or_o three_o several_a way_n the_o small_a difference_n between_o the_o event_n may_v assure_v we_o that_o we_o be_v not_o much_o mistake_v we_o take_v then_o a_o glass_n pipe_n of_o the_o form_n of_o a_o invert_v siphon_n who_o shape_n be_v delineate_v in_o the_o sixteen_o 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be_v make_v to_o burn_v all_o away_o such_o as_o be_v we_o and_o common_a water_n be_v as_o betwixt_o 1_o and_o 1_o 44_o 171._o we_o may_v here_o take_v occasion_n to_o admire_v that_o though_o water_n as_o appear_v by_o the_o experiment_n former_o mention_v of_o the_o pewter_n vessel_n seem_v not_o capable_a of_o any_o considerable_a condensation_n and_o seem_v not_o to_o have_v intersperse_v in_o it_o any_o store_n of_o air_n yet_o quicksilver_n of_o no_o great_a bulk_n than_o water_n shall_v weigh_v near_o fourteen_o time_n as_o much_o but_o have_v only_o point_v at_o this_o as_o a_o thing_n worthy_a of_o consideration_n we_o will_v proceed_v in_o our_o inquiry_n after_o the_o height_n of_o the_o atmosphere_n and_o to_o avoid_v the_o trouble_n of_o fraction_n we_o will_v assume_v that_o quicksilver_n be_v fourteen_o time_n as_o heavy_a as_o water_n since_o it_o want_v so_o little_a of_o be_v so_o wherefore_o have_v now_o give_v we_o the_o proportion_n of_o air_n to_o water_n and_o water_n to_o quicksilver_n it_o will_v be_v very_o easy_a to_o find_v the_o proportion_n betwixt_o air_n and_o quicksilver_n in_o case_n we_o will_v suppose_v the_o atmosphere_n to_o be_v uniform_o of_o such_o a_o consistence_n as_o the_o air_n we_o weigh_v here_o below_o for_o since_o our_o engine_n have_v sufficient_o manifest_v that_o it_o be_v the_o aequilibrium_fw-la with_o the_o external_a air_n that_o in_o the_o torricellian_a experiment_n keep_v the_o quicksilver_n from_o subside_v and_o since_o by_o our_o accurate_a experiment_n former_o mention_v it_o appear_v that_o a_o cylinder_n of_o mercury_n able_a to_o balance_v a_o cylinder_n of_o the_o whole_a atmosphere_n amount_v to_o near_a about_o thirty_o inch_n and_o since_o consequent_o we_o may_v assume_v the_o proportion_n of_o quicksilver_n to_o air_n to_o be_v as_o fourteen_o thousand_o to_o one_o it_o will_v follow_v that_o a_o cylinder_n of_o air_n capable_a to_o maintain_v a_o aequilibrium_fw-la with_o a_o mercurial_a 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springy_a texture_n of_o the_o aerial_a corpuscle_n make_v they_o capable_a of_o a_o very_a great_a compression_n which_o the_o weight_n of_o the_o incumbent_a part_n of_o the_o atmosphere_n be_v very_o sufficient_a to_o give_v those_o that_o be_v undermost_a and_o near_o the_o surface_n of_o the_o earth_n and_o if_o we_o recall_v to_o mind_v those_o former_a experiment_n whereby_o we_o have_v manifest_v that_o air_n much_o rarefy_v without_o heat_n may_v easy_o admit_v a_o far_a rarefaction_n from_o heat_n and_o that_o the_o air_n even_o without_o be_v expanded_a by_o heat_n be_v capable_a of_o be_v rarefy_v to_o above_o one_o hundred_o and_o fifty_o time_n the_o extent_n it_o usual_o possess_v here_o below_o how_o can_v it_o be_v demonstrate_v that_o the_o atmosphere_n may_v not_o for_o aught_o we_o know_v or_o at_o least_o for_o aught_o can_v be_v determine_v by_o our_o
will_v very_o natural_o be_v explain_v by_o it_o as_o let_v we_o suppose_v for_o instance_n the_o diameter_n of_o these_o small_a coyl_v particle_n of_o the_o air_n which_o be_v next_o the_o earth_n be_v press_v upon_o by_o all_o those_o numerous_a incumbent_a particle_n that_o make_v up_o the_o atmosphere_n and_o be_v thereby_o so_o crowd_v that_o they_o can_v but_o very_o little_o untwist_v themselves_o let_v we_o suppose_v i_o say_v the_o diameter_n of_o these_o particle_n to_o be_v 1_o 1000000000000_o of_o a_o inch_n and_o then_o to_o be_v much_o of_o the_o form_n of_o those_o represent_v in_o the_o 4_o figure_n by_o abcd_n and_o that_o these_o particle_n when_o a_o considerable_a quantity_n of_o the_o pressure_n of_o the_o ambient_fw-la parts_z be_v take_v away_o will_v fly_v abroad_o into_o a_o coyle_n or_o zone_n ten_o time_n as_o big_a in_o diameter_n as_o before_o that_o be_v they_o will_v now_o be_v 10_o 1000000000000_o of_o a_o inch_n in_o diameter_n and_o appear_v in_o 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latitant_fw-la within_o the_o fold_n of_o it_o and_o be_v much_o coyl_v up_o together_o scarce_o to_o take_v any_o sensible_a room_n this_o bladder_n in_o the_o air_n will_v appear_v to_o contain_v very_o little_a or_o nothing_o within_o it_o whereas_o when_o the_o pressure_n of_o the_o air_n be_v take_v off_o in_o good_a part_n from_o the_o outside_n of_o it_o then_z those_z formerly_z latitant_fw-la particle_n disclose_v themselves_o by_o fly_v open_a into_o much_o big_a zone_n so_o as_o perhaps_o to_o be_v able_a to_o defend_v a_o thousand_o time_n big_a space_n from_o be_v enter_v into_o by_o their_o like_a or_o any_o other_o gross_a particle_n such_o as_o those_o of_o the_o bladder_n now_o because_o the_o pore_n of_o a_o bladder_n be_v such_o as_o be_v not_o easy_o permeable_a by_o the_o particle_n of_o air_n therefore_o these_o lurk_a particle_n so_o expand_v themselves_o must_v necessary_o plump_a out_o the_o side_n of_o the_o bladder_n and_o so_o keep_v they_o turgid_a until_o the_o pressure_n of_o the_o air_n that_o at_o first_o coyl_v they_o be_v readmit_v to_o do_v the_o same_o thing_n for_o they_o again_o next_o as_o for_o rarefaction_n by_o heat_n that_o will_v as_o natural_o follow_v as_o the_o former_a from_o this_o hypothesis_n for_o the_o atom_n of_o fire_n flow_v in_o in_o great_a number_n and_o pass_v through_o with_o a_o very_a rapid_a motion_n must_v needs_o accelerate_v the_o motion_n of_o these_o particle_n from_o which_o acceleration_n their_o spring_n or_o endeavour_v outward_a will_v be_v augment_v that_o be_v those_o zone_n will_v have_v a_o strong_a nitency_n to_o fly_v wide_a open_a for_o we_o know_v that_o the_o swift_a any_o body_n be_v move_v circular_o the_o more_o do_v the_o part_n of_o it_o endeavour_v to_o recede_v from_o the_o centre_n of_o that_o motion_n from_o whence_o if_o it_o have_v room_n will_v follow_v a_o rarefaction_n as_o for_o the_o conveyance_n of_o light_n that_o be_v according_a to_o epicurus_n perform_v by_o 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of_o the_o determinate_a motion_n and_o figure_n of_o the_o aërial_a particle_n all_o the_o phaenomena_n of_o rarefaction_n and_o condensation_n of_o light_n sound_z heatt_z etc._n etc._n will_v natural_o and_o necessary_o follow_v and_o the_o author_n objection_n against_o this_o first_o way_n of_o rarefaction_n will_v signify_v very_o little_a as_o to_o the_o second_o way_n of_o rarefactiore_fw-la by_o the_o intrusion_n or_o intervention_n of_o some_o subtle_a matter_n or_o aether_n into_o the_o space_n desert_v by_o the_o rarefy_v particle_n which_o be_v that_o propose_v by_o the_o assertor_n of_o a_o plenum_fw-la this_o also_o be_v by_o the_o author_n condemn_v and_o brand_v with_o impossibility_n and_o why_o first_o because_o it_o be_v he_o say_v impossible_a that_o the_o abovementioned_a phaenomena_n of_o the_o carp'_v bladder_n can_v be_v explain_v by_o it_o second_o because_o it_o be_v impossible_a to_o give_v a_o reason_n from_o it_o of_o the_o impetuous_a ascent_n of_o water_n admit_v into_o a_o exhaust_a receiver_n and_o three_o because_o it_o be_v impossible_a to_o explicate_v the_o phaenomena_n of_o gunpowder_n his_o reason_n to_o confirm_v which_o three_o impossibility_n because_o draw_v from_o a_o mere_a mistake_n or_o ignorance_n of_o those_o hypothesis_n which_o have_v be_v invent_v by_o the_o assertor_n of_o that_o opinion_n i_o shall_v pass_v over_o and_o content_v myself_o to_o explain_v a_o way_n how_o these_o impossibility_n may_v become_v possibility_n if_o not_o probability_n and_o the_o way_n that_o i_o shall_v take_v shall_v be_v that_o of_o the_o most_o acute_a modern_a philosopher_n mounseur_fw-fr des_fw-mi cartes_n publish_v in_o his_o philosophical_a work_n which_o be_v this_o that_o the_o air_n be_v a_o body_n consist_v of_o long_a slender_a flexible_a particle_n agitate_a or_o whirl_v round_o by_o the_o rapid_a motion_n of_o the_o globuli_fw-la caelestes_fw-la and_o the_o subtle_a matter_n of_o his_o first_o element_n whereby_o they_o be_v each_o of_o they_o enable_v to_o drive_v or_o force_v out_o of_o their_o vortice_fw-la all_o such_o other_o agitate_a particle_n now_o the_o swift_a these_o body_n be_v whirl_v round_o the_o more_o do_v their_o flexible_a part_n fly_v asunder_o and_o stretch_v themselves_o out_o and_o the_o more_o forcible_o do_v they_o resist_v the_o ingress_n of_o any_o other_o so_o agitate_a particle_n into_o their_o vortice_fw-la and_o consequent_o the_o slow_a their_o motion_n be_v the_o less_o will_v be_v their_o resistance_n and_o because_o there_o be_v a_o vast_a number_n of_o these_o whirl_v particle_n lie_v one_o above_o another_o and_o each_o particle_n have_v its_o peculiar_a gravity_n it_o will_v necessary_o follow_v that_o the_o undermost_a which_o to_o maintain_v their_o vortice_fw-la must_v resist_v so_o great_a a_o pressure_n must_v very_o much_o be_v hinder_v from_o expand_v themselves_o so_o far_o as_o otherwise_o they_o will_v be_v there_o none_o of_o those_o encompass_v agitate_a particle_n that_o lay_v in_o their_o way_n and_o that_o those_o be_v by_o any_o mean_v remove_v or_o they_o themselves_o by_o a_o more_o rapid_a motion_n of_o the_o particle_n of_o their_o vehicles_n the_o first_o and_o second_o element_n which_o be_v according_a to_o that_o hypothesis_n a_o effect_n of_o heat_n more_o swift_o and_o strong_o whirl_v round_o they_o present_o begin_v to_o expand_v themselves_o and_o maintain_v a_o big_a vortice_fw-la than_o before_o now_o to_o perform_v what_o i_o just_a now_o promise_v i_o shall_v endeavour_v to_o give_v a_o possible_a if_o not_o a_o probable_a cause_n of_o the_o object_v phaenomena_n and_o first_o for_o that_o of_o the_o carp'_v bladder_n where_o the_o air_n be_v rarefy_a say_v the_o author_n 1000_o time_n it_o will_v easy_o be_v explain_v by_o suppose_v the_o few_o particle_n of_o the_o air_n which_o whilst_o they_o sustain_v the_o pressure_n of_o all_o the_o incumbent_a atmosphere_n inconspicuous_o lurk_v within_o
the_o bladder_n each_o of_o they_o be_v able_a to_o maintain_v but_o a_o very_a small_a vortice_fw-la to_o be_v by_o the_o subside_v mercury_n in_o the_o torricellian_a experiment_n free_v from_o the_o pressure_n of_o the_o air_n and_o their_o motion_n continue_v the_o same_o by_o reason_n that_o the_o transcursion_n of_o their_o vehicles_n be_v not_o at_o all_o or_o very_o little_a hinder_v either_o by_o the_o glass_n or_o bladder_n their_o part_n have_v room_n to_o expand_v themselves_o will_v fly_v abroad_o to_o such_o extension_n as_o may_v perhaps_o make_v a_o vortice_fw-la 1000_o time_n as_o big_a in_o bulk_n as_o what_o they_o be_v not_o able_a just_o before_o to_o exceed_v hence_o the_o particle_n of_o the_o air_n be_v so_o gross_a as_o not_o easy_o to_o pervade_v the_o pore_n of_o the_o bladder_n must_v necessary_o drive_v out_o the_o side_n of_o the_o bladder_n to_o its_o utmost_a extent_n and_o serve_v to_o fill_v the_o receiver_n in_o the_o magdeburgick_a experiment_n now_o whereas_o these_o particle_n will_v by_o the_o same_o pressure_n of_o the_o air_n be_v reduce_v to_o the_o same_o state_n they_o be_v in_o at_o first_o that_o be_v to_o be_v throng_v into_o a_o very_a little_a room_n and_o thereby_o be_v able_a to_o maintain_v a_o very_a small_a vortice_fw-la the_o air_n let_v in_o in_o the_o torricellian_a experiment_n reduce_v the_o air_n in_o the_o bladder_n to_o its_o former_a inconspicuousness_n as_o the_o admission_n of_o the_o water_n in_o the_o magdeburg_n experiment_n do_v that_o receiver_n full_a of_o rarefy_a air_n into_o the_o bigness_n of_o a_o hazel_n nut._n now_o the_o water_n in_o this_o last-mentioned_a experiment_n enter_v with_o a_o great_a impetuosity_n because_o drive_v on_o with_o the_o whole_a pressure_n of_o the_o atmosphere_n and_o resist_v only_o by_o the_o small_a force_n of_o the_o so-far_a rarefy_a air._n as_o for_o the_o author_n objection_n against_o this_o way_n of_o rarefaction_n draw_v from_o the_o phaenomena_n of_o gunpowder_n i_o shall_v endeavour_v to_o answer_v it_o by_o show_v they_o possible_o explicable_a by_o a_o cartesian_a hypothesis_n for_o suppose_v those_o terrestrial_a part_n of_o the_o gunpowder_n to_o be_v first_o at_o rest_n and_o afterward_o agitate_a by_o the_o rapid_a motion_n of_o his_o first_o element_n there_o will_v be_v sufficient_a difference_n of_o the_o former_a and_o late_a condition_n in_o respect_n of_o extension_n and_o suppose_v the_o particular_a constitution_n of_o gunpowder_n arise_v partly_o from_o the_o specific_a form_n of_o the_o particle_n of_o its_o ingredient_n nitre_n sulphur_n and_o char-coal_n and_o partly_o from_o their_o proportionate_a commistion_n to_o be_v such_o as_o will_v ready_o yield_v to_o the_o motion_n of_o his_o materia_fw-la subtilis_fw-la so_o soon_o as_o a_o ingress_n be_v admit_v to_o it_o by_o the_o fire_n of_o any_o particular_a parcel_n of_o it_o the_o expansion_n will_v be_v speedy_a enough_o so_o then_o let_v we_o suppose_v a_o barrel_n of_o gunpowder_n place_v in_o some_o close_a room_n to_o some_o grain_n of_o which_o we_o will_v suppose_v some_o actual_a fire_n to_o be_v apply_v by_o which_o actual_a fire_n the_o texture_n of_o the_o powder_n be_v such_o those_o grain_n be_v sudden_o fire_v that_o be_v many_o million_o of_o part_n which_o before_o lay_v still_o and_o at_o rest_n be_v by_o the_o action_n of_o the_o burn_a coal_n shatter_v as_o it_o be_v and_o put_v into_o a_o posture_n ready_a to_o be_v agitate_a by_o the_o rapid_a motion_n of_o the_o materia_fw-la subtilis_fw-la into_o which_o posture_n they_o be_v no_o soon_o put_v than_o agitate_a and_o whirl_v sufficient_o by_o it_o whence_o follow_v a_o vast_a expansion_n of_o that_o part_n of_o gunpowder_n so_o fire_v for_o each_o of_o its_o part_n be_v thus_o whirl_v and_o hurry_v round_o expel_v and_o beat_v off_o with_o great_a violence_n all_o the_o contiguous_a particle_n so_o as_o that_o each_o particle_n take_v up_o now_o 1000_o time_n as_o much_o elbow-room_n if_o i_o may_v so_o speak_v as_o just_a before_o serve_v its_o turn_n and_o consequent_o those_o that_o be_v outermost_a take_v every_o one_o their_o way_n direct_o from_o the_o parcel_n or_o corn_n they_o have_v lie_v quiet_a in_o be_v hurry_v away_o by_o the_o sudden_a expansion_n of_o the_o particle_n that_o lie_v next_o within_o they_o so_o that_o whatever_o grain_n or_o parcel_n of_o gunpowder_n they_o chance_v to_o meet_v with_o before_o they_o have_v lose_v their_o motion_n they_o present_o shiver_v and_o put_v into_o such_o a_o motion_n as_o make_v they_o fit_a to_o receive_v the_o action_n of_o the_o materia_fw-la subtilis_fw-la which_o subtle_a matter_n be_v every_o where_o present_a and_o nothing_o slow_a in_o perform_v its_o office_n immediate_o agitate_v those_o also_o like_o the_o former_a so_o that_o in_o a_o trice_n the_o particle_n of_o the_o whole_a barrel_n of_o gunpowder_n be_v thus_o disorder_v and_o by_o the_o motion_n the_o materia_fw-la subtilis_fw-la must_v needs_o be_v hurry_v away_o with_o so_o great_a a_o impetuosity_n on_o all_o side_n as_o not_o only_o to_o break_v in_o piece_n its_o slight_a wooden_a prison_n and_o remove_v the_o light_a particle_n of_o the_o ambient_fw-la air_n but_o huge_a beam_n nay_o vast_a accumulate_v mass_n of_o the_o most_o compact_a structure_n of_o stone_n and_o even_o shake_v the_o very_a earth_n itself_o or_o whatever_o else_o stand_v in_o its_o way_n who_o texture_n be_v so_o close_o as_o not_o to_o give_v its_o particle_n free_a passage_n through_o its_o pore_n this_o understand_v i_o see_v not_o first_o what_o the_o author_n be_v three_o argument_n bring_v to_o prove_v his_o objection_n signify_v for_o there_o be_v no_o more_o corpuscle_n in_o the_o room_n before_o the_o gunpowder_n be_v fire_v than_o after_o nor_o be_v there_o any_o more_o matter_n or_o substance_n before_o the_o side_n of_o the_o room_n by_o yield_a give_v place_n for_o the_o external_a fluid_a body_n to_o succeed_v and_o the_o only_a change_n be_v this_o that_o the_o globuli_fw-la secundi_fw-la elementi_fw-la as_o he_o call_v they_o be_v expel_v out_o of_o the_o room_n and_o the_o materia_fw-la primi_fw-la elementi_fw-la succeed_v in_o the_o place_n of_o it_o nor_o do_v i_o see_v second_o what_o great_a reason_n he_o have_v for_o his_o grand_a conclusion_n haeo_n abundè_fw-la demonstrant_fw-la rarefactionem_fw-la per_fw-la hujusmodi_fw-la corpuscula_fw-la nullatenus_fw-la posse_fw-la explicari_fw-la have_v thus_o examine_v the_o author_n first_o argument_n that_o rarefaction_n can_v be_v make_v out_o by_o any_o other_o way_n than_o he_o we_o shall_v find_v his_o other_o which_o he_o bring_v to_o establish_v his_o own_o hypothesis_n much_o of_o the_o same_o kind_n as_o first_o that_o his_o way_n of_o rarefaction_n imply_v no_o contradiction_n for_o if_o the_o affirm_v a_o body_n to_o be_v real_o and_o total_o in_o this_o place_n and_o at_o the_o same_o time_n to_o be_v real_o and_o whole_o in_o another_o that_o be_v to_o be_v in_o this_o place_n and_o not_o to_o be_v in_o this_o place_n be_v not_o a_o contradiction_n i_o know_v not_o what_o be_v next_o that_o some_o learned_a schoolman_n have_v think_v so_o to_o which_o i_o answer_v more_o learned_a man_n have_v think_v otherwise_o and_o last_o that_o there_o be_v very_o plain_a example_n of_o the_o like_a nature_n to_o be_v find_v in_o other_o thing_n of_o which_o he_o only_o bring_v one_o viz._n that_o of_o the_o rota_n aristotelica_n which_o upon_o examination_n we_o shall_v find_v to_o make_v as_o little_a to_o the_o purpose_n as_o any_o of_o the_o other_o a_o explication_n of_o the_o rota_n aristotelica_n the_o great_a problem_n of_o the_o rota_n aristotelica_n by_o his_o explication_n of_o which_o he_o pretend_v not_o only_o to_o solve_v all_o the_o difficulty_n concern_v local_a motion_n quae_fw-la philosophorum_fw-la ingenia_fw-la bactenus_fw-la valde_fw-la exercuerunt_fw-la but_o to_o give_v a_o instance_n for_o the_o confirmation_n of_o his_o unintelligible_a hypothesis_n of_o rarefaction_n wherein_o there_o be_v extensio_fw-la seu_fw-la correspondentia_fw-la ejusdem_fw-la rei_fw-la ad_fw-la locum_fw-la nunc_fw-la majorem_fw-la nunc_fw-la minorem_fw-la we_o may_v upon_o examination_n find_v to_o be_v either_o a_o paralogism_n or_o else_o nothing_o but_o what_o those_o philosopher_n say_v who_o he_o account_v gravel_v with_o it_o of_o this_o subject_a he_o begin_v in_o his_o 25_o chapter_n where_o after_o he_o have_v set_v down_o a_o description_n of_o it_o he_o make_v a_o instance_n in_o a_o cartwheel_n rem_fw-la ante_fw-la oculos_fw-la ponit_fw-la rota_fw-la alicujus_fw-la currus_fw-la ejusque_fw-la umbo_fw-la seu_fw-la lignum_fw-la illudcrassum_fw-la &_o rotundum_fw-la cui_fw-la infiguntur_fw-la radii_fw-la siquidem_fw-la dum_fw-la progrediente_fw-la curru_fw-la ipsa_fw-la rota_fw-la circumduct_v a_o describit_fw-la in_o subject_a a_o terra_fw-la orbitam_fw-la sibi_fw-la aequalem_fw-la umbo_fw-la ille_fw-la describit_fw-la in_o subjecto_fw-la aëre_fw-la orbitam_fw-la i_o suppose_v both_o
as_o esteem_v for_o astronomy_n as_o mr._n hobbs_n have_v express_o endeavour_v to_o confute_v it_o and_o that_o not_o without_o some_o derision_n which_o yet_o i_o willing_o forbear_v to_o imitate_v by_o argument_n that_o i_o can_v learn_v mr._n hobbs_n have_v yet_o answer_v and_o i_o be_o inform_v that_o the_o learned_a dr._n wallis_n and_o other_o intend_v some_o animadversion_n on_o this_o motion_n but_o restrain_v our_o present_a consideration_n to_o what_o this_o dialogue_n suggest_v to_o i_o this_o assumption_n to_o i_o seem_v very_o precarious_a since_o i_o know_v not_o any_o unquestionable_a example_n or_o experiment_n whereby_o it_o can_v be_v make_v out_o that_o any_o small_a parcel_n of_o matter_n have_v such_o a_o motus_fw-la circularis_fw-la simplex_fw-la as_o he_o ascribe_v to_o each_o of_o these_o innumerable_a earthy_a and_o as_o himself_o add_v in_o the_o same_o page_n aqueous_a particle_n the_o only_a argument_n he_o bring_v in_o that_o page_n to_o prove_v that_o each_o atom_n will_v have_v this_o motion_n if_o all_o the_o rest_n of_o the_o earth_n be_v annihilate_v do_v not_o to_o i_o seem_v clear_a for_o not_o to_o mention_v that_o it_o be_v still_o by_o many_o learned_a man_n doubt_v whether_o the_o terrestrial_a globe_n itself_o have_v it_o nor_o to_o examine_v whether_o or_o no_o he_o assign_v a_o good_a natural_a cause_n of_o it_o it_o be_v not_o always_o true_a that_o each_o minute_n part_n of_o a_o homogeneous_a body_n which_o yet_o it_o will_v be_v hard_a to_o prove_v the_o terrestrial_a globe_n to_o be_v have_v in_o every_o respect_n the_o same_o quality_n with_o the_o whole_a as_o the_o roundness_n which_o a_o small_a drop_n of_o water_n or_o quicksilver_n be_v common_o observe_v to_o have_v when_o it_o lean_v upon_o a_o dry_a or_o greasy_a plain_n be_v not_o to_o be_v meet_v with_o in_o great_a portion_n of_o either_o of_o those_o liquor_n though_o place_v upon_o the_o same_o plain_a and_o mr._n hobbs_n as_o well_o as_o we_o make_v the_o terrene_a atom_n in_o the_o air_n to_o have_v gravity_n which_o yet_o be_v a_o quality_n that_o do_v not_o proper_o belong_v to_o the_o whole_a globe_n of_o the_o earth_n nor_o be_v it_o manifest_v why_o because_o the_o terrestrial_a globe_n move_v in_o a_o vast_a circle_n about_o the_o sun_n each_o particular_a atom_n of_o it_o must_v describe_v a_o small_a circle_n in_o the_o air_n about_o i_o know_v not_o what_o centre_n and_o since_o he_o teach_v in_o his_o second_o hypothesis_n and_o a_o few_o line_n before_o it_o that_o the_o air_n near_o the_o earth_n abound_v with_o such_o terrene_a corpuscle_n it_o be_v not_o likely_a they_o shall_v be_v permit_v to_o exercise_v such_o a_o regular_a motion_n as_o he_o attribute_n to_o they_o but_o hit_v against_o one_o another_o they_o must_v in_o probability_n be_v put_v into_o almost_o as_o various_a and_o confuse_a a_o motion_n as_o des_n cartes_n ascribe_v to_o his_o terrestrial_a particle_n swim_v in_o the_o atmosphere_n that_o which_o some_o will_n i_o doubt_v not_o peculiarly_a wonder_n at_o in_o mr._n hobbs_n hypothesis_n be_v that_o he_o make_v this_o regular_a motion_n of_o each_o atom_n naturae_fw-la suae_fw-la congenitus_fw-la for_o philosopher_n that_o be_v know_v to_o wish_v very_o well_o to_o religion_n and_o to_o have_v do_v it_o good_a service_n have_v be_v very_o rich_a of_o have_v recourse_n as_o he_o have_v to_o creation_n for_o the_o explain_n of_o particular_a phaenomena_n and_o the_o cartesian_o will_v think_v it_o at_o least_o as_o allowable_a for_o they_o to_o suppose_v the_o motion_n he_o will_v not_o grant_v in_o their_o materia_fw-la subtilis_fw-la as_o for_o mr._n hobbs_n to_o assume_v it_o in_o his_o particulae_fw-la terreae_fw-la especial_o since_o he_o seem_v to_o make_v each_o such_o atom_n put_v into_o and_o keep_v in_o a_o regular_a motion_n whereas_o they_o assume_v but_o the_o have_v of_o one_o general_a impulse_n give_v to_o the_o whole_a mass_n of_o matter_n those_o likewise_o that_o fancy_n a_o spring_n proper_o so_o call_v in_o particular_a aerial_a corpuscle_n will_v hence_o perhaps_o take_v occasion_n to_o think_v they_o may_v suppose_v a_o ingenite_fw-la motion_n fit_n for_o their_o turn_n as_o well_o as_o he_o a_o ingenite_fw-la motus_fw-la circularis_fw-la simplex_fw-la how_o well_o like_o wise_a this_o hypothesis_n will_v agree_v with_o his_o fundamental_a doctrine_n that_o nihil_fw-la movetur_fw-la nisi_fw-la à _fw-la corpore_fw-la contiguo_fw-la &_o moto_fw-mi i_o leave_v to_o he_o to_o consider_v as_o also_o whither_o or_o no_o gassendus_fw-la and_o those_o other_o atomist_n that_o admit_v creation_n may_v not_o hence_o countenance_v their_o grand_a supposition_n of_o the_o congenite_fw-la motion_n of_o atom_n which_o grant_v will_v destroy_v the_o best_a part_n of_o mr._n hobbs_n philosophy_n but_o whatever_o become_v of_o this_o motus_fw-la circularis_fw-la simplex_fw-la i_o need_v not_o be_v much_o solicitous_a have_v former_o show_v that_o the_o admission_n of_o it_o will_v not_o disprove_v what_o i_o have_v deliver_v concern_v the_o spring_n of_o the_o air_n and_o therefore_o leave_v mr._n hobbs_n to_o dispute_v it_o out_o if_o he_o think_v fit_a with_o his_o other_o adversary_n i_o will_v proceed_v to_o the_o main_a explication_n wherein_o mr._n hobbs_n endeavour_v to_o prefer_v his_o doctrine_n about_o the_o phaenomena_n of_o our_o engine_n before_o we_o and_o these_o i_o find_v to_o be_v the_o four_o that_o ensue_v the_o first_o and_o principal_n of_o these_o be_v that_o wherein_o he_o strive_v to_o prove_v that_o by_o the_o exhaustion_n of_o our_o cylinder_n no_n vacuum_n be_v produce_v and_o to_o give_v of_o the_o experiment_n itself_o a_o very_a differ_a account_n from_o we_o this_o he_o do_v in_o the_o follow_a passage_n which_o by_o reason_n of_o its_o importance_n in_o our_o present_a controversy_n we_o shall_v set_v down_o verbatim_o dum_fw-la suctor_n say_v he_o retrahitur_fw-la quanto_fw-la relict_n we_o locus_fw-la major_a fit_n tanto_fw-la minus_fw-la loci_fw-la relinquitur_fw-la aëri_fw-la externo_fw-la qui_fw-la retrusus_fw-la 5._o à _fw-la suctore_fw-la moto_fw-mi versus_fw-la externa_fw-la proximum_fw-la sibi_fw-la aërem_fw-la similiter_fw-la movet_fw-la &_o hic_fw-la alium_fw-la &_o sic_fw-la continuè_fw-fr ita_fw-la ut_fw-la necesse_fw-la sit_fw-la aërem_fw-la tandem_fw-la compelli_fw-la in_o locum_fw-la desertum_fw-la à _fw-la suctore_fw-la &_o intrare_fw-la inter_fw-la superficiem_fw-la suctoris_fw-la convexam_fw-la &_o cylindri_fw-la concavam_fw-la supposito_fw-la enim_fw-la aëris_fw-la part_n esse_fw-la infinitè_fw-fr subtiles_fw-la impossibile_fw-it est_fw-la ut_fw-la viâ_fw-la illâ_fw-la qua_fw-la retrahitur_fw-la suctor_n illae_fw-la non_fw-la se_fw-la insinuent_fw-la primò_fw-la enim_fw-la contactus_fw-la superficierum_fw-la istarum_fw-la per_fw-la omne_fw-la puncta_fw-la perfectus_fw-la esse_fw-la non_fw-la potest_fw-la quia_fw-la ipsae_fw-la superficies_n fieri_fw-la infinitè_fw-fr laeves_fw-la non-possunt_a deinde_fw-la vis_fw-la illa_fw-la quae_fw-la ad_fw-la suctorem_fw-la revellendum_fw-la adhibetur_fw-la cavitatem_fw-la cylindri_fw-la aliquantulum_fw-la distendit_fw-la postremo_fw-la si_fw-la in_o confinio_fw-la duarum_fw-la dictarum_fw-la superficierum_fw-la ingrediatur_fw-la una_fw-la tantum_fw-la atomus_fw-la dura_fw-la aër_fw-la purus_fw-la eâ_fw-la viâ_fw-la ingreditur_fw-la conatu_fw-la quantumvis_fw-la debili_fw-la poteram_fw-la etiam_fw-la computasse_fw-la aërem_fw-la illum_fw-la qui_fw-la propter_fw-la eandem_fw-la causam_fw-la insinuasset_fw-la se_fw-la per_fw-la cylindri_fw-la valvulam_fw-la sublatam_fw-la ergo_fw-la vides_fw-la consequentiam_fw-la à _fw-la retractione_fw-la suctoris_fw-la ad_fw-la locum_fw-la vacuum_fw-la secuturum_fw-la hoc_fw-la quoque_fw-la est_fw-la aëremillum_fw-la qui_fw-la est_fw-la in_o locum_fw-la à _fw-la suctore_fw-la desertum_fw-la impulsus_fw-la quia_fw-la magnâ_fw-la vi_fw-la impulsus_fw-la est_fw-la motu_fw-la valde_fw-la celeri_fw-la &_o per_fw-la circuitum_fw-la inter_fw-la summum_fw-la &_o imum_fw-la in_o cylindro_fw-la moveri_fw-la cum_fw-la nondum_fw-la sit_fw-la quod_fw-la motum_fw-la ejus_fw-la possit_fw-la debilitare_fw-la scis_fw-la autem_fw-la nihil_fw-la esse_fw-la quod_fw-la sibi_fw-la motum_fw-la aut_fw-la impertiri_fw-la possit_fw-la aut_fw-la diminuere_fw-la but_o this_o ratiocination_n contain_v divers_a thing_n liable_a to_o exception_n and_o in_o order_n to_o the_o examine_n of_o it_o i_o must_v premise_v that_o i_o know_v not_o why_o mr._n hobbs_n shall_v here_o confine_v his_o discourse_n to_o the_o pump_n without_o take_v notice_n of_o the_o glass_n for_o who_o evacuation_n it_o be_v design_v wherefore_o for_o easy_a consideration_n sake_n we_o will_v consider_v how_o this_o discourse_n will_v account_v for_o the_o exhaustion_n of_o the_o receiver_n as_o well_o as_o for_o the_o cylinder_n for_o we_o usual_o empty_v they_o both_o in_o the_o same_o trial_n and_o he_o be_v oblige_v to_o explicate_v the_o exhaustion_n of_o the_o one_o as_o well_o as_o the_o other_o it_o will_v be_v convenient_a to_o take_v into_o consideration_n the_o receiver_n also_o because_o that_o be_v of_o glass_n and_o transparent_a we_o can_v better_o see_v what_o happen_v in_o it_o than_o in_o the_o opacous_a cylinder_n this_o premise_a we_o may_v now_o proceed_v to_o the_o exception_n themselves_o and_o first_o i_o
some_o place_n empty_a to_o prove_v that_o a_o vacuum_n be_v possible_a if_o full_a they_o say_v that_o be_v full_a which_o they_o suppose_v to_o be_v empty_a p._n 56._o fuere_fw-la etc._n etc._n there_o be_v some_o of_o they_o that_o say_v there_o remain_v in_o those_o coal_n though_o they_o seem_v extinguish_v some_o fiery_a particle_n which_o be_v blow_v up_o by_o the_o air_n upon_o its_o admission_n do_v re-kindle_a the_o rest_n of_o the_o mass_n ibid._n nae_n etc._n etc._n in_o good_a faith_n they_o seem_v not_o so_o much_o as_o to_o have_v consider_v what_o they_o shall_v speak_v as_o to_o have_v take_v it_o up_o at_o all_o adventure_n do_v you_o believe_v that_o in_o a_o kindle_a coal_n there_o be_v any_o part_n which_o be_v not_o a_o coal_n but_o fire_n or_o in_o a_o red-hot_a iron_n there_o be_v any_o part_n that_o be_v not_o iron_n but_o fire_n a_o great_a city_n may_v be_v set_v on_o fire_n by_o one_o spark_n now_o if_o the_o body_n of_o fire_n be_v different_a from_o the_o thing_n fire_v there_o can_v be_v no_o more_o part_n of_o fire_n in_o the_o whole_a town_n on_o fire_n than_o that_o one_o spark_n we_o see_v body_n of_o divers_a kind_n may_v be_v set_v on_o fire_n by_o the_o light_n of_o the_o sun_n as_o well_o by_o the_o refraction_n as_o the_o reflection_n that_o be_v make_v in_o burning-glass_n and_o yet_o i_o do_v not_o believe_v that_o there_o be_v any_o man_n think_v that_o particle_n of_o fire_n dart_v from_o the_o sun_n can_v pass_v through_o the_o substance_n of_o a_o crystal_n globe_n and_o in_o the_o air_n between_o the_o sun_n and_o the_o globe_n there_o be_v no_o fire_n p._n 58._o when_o be_v it_o that_o we_o may_v true_o say_v of_o a_o man_n that_o he_o be_v dead_a or_o which_o be_v the_o same_o have_v expire_v his_o soul_n for_o it_o have_v be_v know_v that_o some_o man_n who_o have_v be_v take_v for_o dead_a be_v bring_v out_o the_o next_o day_n revive_v a._n it_o be_v hard_o to_o determine_v the_o point_n of_o time_n in_o which_o the_o soul_n be_v separate_v from_o the_o body_n proceed_v therefore_o to_o other_o experiment_n p._n 59_o si_fw-mi acus_fw-la etc._n etc._n if_o a_o needle_n excite_v by_o a_o loadstone_n hang_v free_o within_o the_o receiver_n it_o will_v nevertheless_o follow_v the_o motion_n of_o the_o iron_n which_o be_v draw_v about_o without_o the_o receiver_n so_o object_n put_v within_o will_v be_v see_v by_o those_o that_o be_v without_o and_o sound_v make_v within_o will_v be_v hear_v without_o all_o these_o as_o well_o after_o as_o before_o the_o exsuction_n of_o the_o air_n except_o that_o the_o sound_n be_v somewhat_o more_o weak_o hear_v after_o than_o before_o b._n these_o be_v most_o manifest_a sign_n that_o the_o receiver_n be_v always_o full_a and_o that_o the_o air_n can_v thence_o be_v suck_v out_o that_o the_o sound_n thence_o be_v more_o weak_a to_o one_o hearing_n be_v a_o sign_n of_o the_o consistence_n of_o the_o air_n for_o the_o consistence_n of_o the_o air_n be_v diametrical_o opposite_a from_o its_o motion_n p._n 61._o quia_fw-la nihil_fw-la etc._n etc._n because_o there_o be_v nothing_o there_o that_o the_o weight_n of_o the_o atmosphere_n shall_v do_v no_o more_o strong_a or_o evident_a argument_n can_v be_v make_v against_o a_o vacuum_n than_o this_o experiment_n for_o if_o of_o two_o coherent_a marble_n either_o of_o they_o shall_v be_v thrust_v forward_o that_o way_n that_o their_o surface_n lie_v contiguous_a they_o will_v easy_o be_v sever_v the_o neighbour_a air_n successive_o flow_v into_o the_o desert_a place_n but_o so_o to_o pull_v they_o asunder_o that_o at_o one_o time_n they_o shall_v lose_v their_o whole_a contact_n be_v impossible_a the_o world_n be_v full_a for_o then_o either_o motion_n must_v be_v make_v from_o one_o term_n to_o another_o in_o a_o instant_n or_o two_o body_n at_o the_o same_o time_n must_v be_v in_o the_o same_o place_n to_o say_v either_o of_o which_o be_v absurd_a p._n 62._o confitentur_fw-la etc._n etc._n they_o themselves_o and_o all_o other_o confess_v that_o all_o ponderation_n be_v a_o endeavour_n every_o way_n by_o right_a line_n unto_o the_o centre_n of_o the_o earth_n and_o so_o that_o it_o be_v make_v not_o by_o the_o figure_n of_o a_o cylinder_n or_o column_n but_o by_o a_o pyramid_n who_o top_n be_v the_o centre_n of_o the_o earth_n and_o who_o basis_n be_v part_n of_o the_o surface_n of_o the_o atmosphere_n ibid._n conatus_fw-la etc._n etc._n therefore_o the_o endeavour_n of_o all_o the_o point_v that_o ponderate_a will_v be_v propagate_v to_o the_o surface_n of_o the_o upper_a marble_n before_o it_o can_v be_v propagate_v further_o suppose_v to_o the_o earth_n p._n 64._o have_v etc._n etc._n these_o scale_n he_o put_v one_o upon_o another_o and_o draw_v out_o the_o air_n and_o then_o be_v they_o keep_v so_o compress_v and_o unite_v by_o the_o gravity_n of_o the_o external_a air_n that_o six_o strong_a man_n can_v pull_v they_o asunder_o but_o if_o at_o length_n by_o the_o use_n of_o utmost_a endeavour_n they_o be_v pluck_v in_o sunder_o they_o make_v a_o noise_n equal_a to_o the_o report_n of_o a_o musket_n but_o as_o soon_o as_o ever_o by_o the_o stop-cock_n open_v there_o be_v the_o least_o entrance_n give_v to_o the_o air_n they_o be_v sever_v of_o their_o own_o accord_n p._n 65._o sed_fw-la vis_fw-la etc._n etc._n but_o can_v the_o spring_n which_o they_o say_v be_v in_o the_o air_n confer_v nothing_o to_o the_o hold_v up_o the_o marble_n nothing_o at_o all_o for_o there_o be_v no_o endeavour_n of_o the_o air_n to_o the_o centre_n of_o the_o earth_n more_o than_o to_o any_o other_o point_n in_o the_o universe_n for_o see_v that_o heavy_a thing_n tend_v from_o the_o circumference_n of_o the_o atmosphere_n unto_o the_o centre_n of_o the_o earth_n and_o thence_o again_o to_o the_o circumference_n of_o the_o atmosphere_n by_o the_o same_o reflect_a line_n the_o endeavour_n upward_o will_v be_v equal_a to_o the_o endeavour_n downward_o and_o so_o destroy_v one_o another_o they_o will_v endeavour_v neither_o way_n p._n 66._o non_fw-la potest_fw-la ergo_fw-la pars_fw-la bc_n etc._n etc._n therefore_o the_o part_n bc_n that_o be_v a_o part_n of_o the_o atmosphere_n place_v any_o where_o within_o the_o whole_a can_v by_o reason_n of_o its_o greatness_n descend_v although_o it_o be_v heavy_a and_o therefore_o it_o can_v press_v or_o gravitate_fw-la ibid._n si_fw-mi possibile_fw-la etc._n etc._n if_o i_o shall_v deny_v it_o possible_a that_o by_o the_o art_n of_o man_n two_o furface_n of_o two_o body_n can_v be_v make_v so_o accurate_o fit_a that_o they_o shall_v touch_v in_o all_o point_n so_o that_o there_o can_v no_o creable_a corpuscle_n pass_v between_o they_o i_o do_v not_o see_v how_o they_o can_v defend_v their_o own_o hypothesis_n or_o disprove_v our_o negative_a assertion_n ibid._n utraque_fw-la etc._n etc._n both_o these_o fancy_n as_o well_o that_o of_o the_o weight_n as_o of_o the_o spring_n or_o antitupy_v of_o the_o air_n be_v dream_n but_o if_o it_o be_v grant_v that_o there_o be_v a_o kind_n of_o recoil_n in_o those_o small_a hair_n or_o slender_a corpuscle_n of_o which_o the_o air_n consist_v one_o may_v inquire_v whence_o it_o be_v that_o those_o crooked_a body_n settle_a and_o at_o quiet_a in_o that_o posture_n come_v to_o be_v move_v into_o a_o straightness_n they_o ought_v if_o they_o will_v be_v esteem_v natural_a philosopher_n to_o assign_v some_o possible_a cause_n of_o this_o p._n 67._o cur_n non_fw-la etc._n etc._n why_o can_v the_o water_n which_o when_o it_o be_v inject_v do_v compress_v the_o particle_n of_o air_n be_v again_o cast_v out_o by_o the_o same_o particle_n explicate_v themselves_o a._n because_o when_o explicate_v they_o require_v no_o great_a place_n than_o when_o compress_v as_o in_o a_o vessel_n full_a of_o water_n wherein_o be_v many_o eel_n the_o same_o proportion_n of_o place_n receive_v they_o whether_o they_o be_v fold_v round_o or_o at_o length_n therefore_o they_o can_v drive_v up_o the_o water_n by_o their_o spring_n which_o be_v nothing_o else_o but_o the_o motion_n of_o body_n explicate_v themselves_o b._n the_o comparison_n of_o air_n to_o eel_n in_o water_n i_o suppose_v will_v be_v well_o receive_v by_o our_o academian_o p._n 68_o vides_fw-la etc._n etc._n you_o see_v how_o foolish_a a_o thing_n it_o be_v to_o bring_v for_o the_o explication_n of_o such_o effect_n metaphorical_a word_n as_o the_o shun_v of_o a_o vacuum_n the_o ahhorrence_n of_o nature_n etc._n etc._n which_o heretofore_o the_o school_n use_v to_o defend_v their_o reputation_n ibid._n in_o the_o gardener_n watering-pot_n therefore_o be_v the_o water_n suspend_v because_o that_o which_o issue_v out_o at_o so_o small_a a_o hole_n be_v so_o little_a that_o it_o can_v diffuse_v itself_o to_o