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diameter_n without_o the_o help_n of_o a_o considerable_a weight_n be_v the_o pressure_n i_o be_v late_o mention_v of_o the_o ambient_fw-la air_n i_o cause_v two_o such_o coherent_a marble_n to_o be_v suspend_v in_o a_o large_a receiver_n with_o a_o weight_n at_o the_o lowermost_a that_o may_v help_v to_o keep_v they_o steady_a but_o be_v very_o inconsiderable_a to_o that_o which_o their_o cohesion_n may_v have_v surmount_v then_o cause_v the_o air_n to_o be_v pump_v by_o degree_n out_o of_o the_o receiver_n for_o a_o good_a while_o the_o marble_n stick_v close_o together_o because_o during_o that_o time_n the_o air_n can_v not_o be_v so_o far_o pump_v out_o but_o that_o there_o remain_v enough_o to_o sustain_v the_o small_a weight_n that_o endeavour_v their_o divulsion_n but_o when_o the_o air_n be_v further_o pump_v out_o at_o length_n the_o spring_n of_o the_o little_a but_o not_o a_o little_a expanded_a air_n that_o remain_v be_v grow_v too_o weak_a to_o sustain_v the_o low_a 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illorum_fw-la effectuum_fw-la qui_fw-la ostenduntur_fw-la per_fw-la machinam_fw-la illam_fw-la quae_fw-la est_fw-la in_o collegio_fw-la greshamensi_fw-la b._n machina_fw-la illa_fw-la b._n stop_v here_o i_o beseech_v you_o a_o little_a that_o before_o we_o go_v any_o further_a i_o may_v take_v notice_n to_o you_o of_o a_o couple_n of_o thing_n that_o will_v concern_v our_o subsequent_a discourse_n whereof_o the_o first_o be_v that_o it_o appear_v by_o mr._n hobbes_n dialogue_n about_o the_o air_n that_o the_o explication_n he_o there_o give_v of_o some_o of_o the_o phaenomena_n of_o the_o machina_fw-la boyliana_n be_v direct_v partly_o against_o the_o virtuoso_n that_o have_v since_o be_v honour_v with_o the_o title_n of_o the_o royal_a society_n and_o partly_o against_o the_o author_n of_o that_o engine_n as_o if_o the_o main_a thing_n therein_o design_v be_v to_o prove_v a_o vacuum_n and_o since_o he_o now_o repeat_v the_o same_o explication_n i_o think_v it_o necessary_a to_o say_v 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the_o less_o experience_v than_o ingenious_a friend_n to_o our_o hypothesis_n with_o more_o ground_n of_o answer_v the_o late_a objection_n of_o some_o learned_a man_n against_o who_o endeavour_n i_o perceive_v it_o will_v be_v useful_a to_o employ_v variety_n of_o experiment_n and_o other_o proof_n to_o evince_v the_o same_o truth_n that_o some_o or_o other_o of_o these_o may_v meet_v with_o those_o argument_n or_o evasion_n with_o which_o they_o strive_v to_o elude_v the_o force_n of_o the_o rest_n the_o title_n of_o the_o follow_a essay_n may_v sufficient_o keep_v the_o reader_n from_o expect_v to_o find_v any_o other_o kind_n of_o attraction_n discourse_v of_o than_o that_o which_o be_v make_v by_o suction_n but_o yet_o thus_o much_o i_o shall_v here_o intimate_v in_o general_n that_o i_o have_v find_v by_o trial_n purposely_o make_v that_o the_o example_n of_o suction_n be_v not_o the_o only_o note_v one_o of_o attraction_n that_o may_v be_v reduce_v to_o pulsion_n of_o the_o cause_n of_o attraction_n by_o suction_n chap._n i._n i_o may_v sir_n save_v myself_o some_o trouble_n in_o give_v you_o that_o account_v you_o desire_v of_o i_o about_o suction_n by_o refer_v you_o to_o a_o passage_n in_o the_o examen_fw-la i_o long_o since_o write_v of_o mr._n hobbes_n dialogus_fw-la physicus_fw-la de_fw-la natura_fw-la aeris_fw-la if_o i_o know_v you_o have_v those_o two_o book_n lie_v by_o you_o but_o because_o i_o suspect_v that_o my_o examen_fw-la may_v not_o be_v in_o your_o hand_n since_o it_o be_v a_o most_o out_o of_o print_n and_o have_v not_o for_o some_o year_n be_v in_o my_o own_o and_o because_o i_o do_v not_o so_o well_o remember_v after_o so_o long_a a_o time_n the_o particular_n that_o i_o write_v there_o about_o suction_n as_o i_o do_v in_o general_n that_o the_o hypothesis_n i_o propose_v be_v very_o incidental_o and_o brief_o discourse_v of_o upon_o a_o occasion_n minister_v by_o a_o wrong_a explication_n give_v of_o suction_n by_o mr._n hobbes_n i_o shall_v here_o decline_v refer_v you_o to_o what_o i_o there_o writâ—_n and_o propose_v to_o you_o those_o thought_n about_o suction_n that_o i_o remember_v i_o there_o point_v at_o i_o shall_v annex_v some_o thing_n to_o illustrate_v and_o confirm_v they_o that_o will_v not_o have_v be_v so_o proper_a for_o i_o to_o have_v insist_v on_o in_o a_o short_a and_o but_o occasional_a excursion_n and_o i_o shall_v immediate_o proceed_v to_o what_o you_o expect_v from_o i_o but_o that_o suction_n be_v general_o look_v upon_o as_o a_o kind_n of_o attraction_n it_o will_v be_v requisite_a for_o i_o to_o premise_v something_o about_o attraction_n itself_o for_o beside_o that_o the_o cause_n of_o it_o which_o i_o here_o dispute_v not_o of_o be_v obscure_a the_o very_a nature_n and_o notion_n of_o it_o be_v wont_n by_o naturalist_n to_o be_v either_o left_a untouched_a or_o but_o very_o dark_o deliver_v and_o therefore_o will_v not_o be_v unfit_a to_o be_v here_o somewhat_o explain_v how_o 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the_o orifice_n of_o the_o pipe_n proceed_v from_o the_o weight_n of_o the_o atmosphere_n or_o the_o propagate_v compression_n or_o impulse_n of_o some_o part_n of_o the_o air_n or_o the_o spring_n of_o the_o air_n or_o some_o other_o cause_n as_o the_o pressure_n of_o some_o other_o body_n quite_o distinct_a from_o air._n upon_o the_o general_a view_n of_o this_o hypothesis_n it_o seem_v very_o consonant_a to_o the_o mechanical_a principle_n for_o if_o there_o be_v on_o the_o differ_a part_n of_o the_o surface_n of_o a_o fluid_a body_n unequal_a pressure_n it_o be_v plain_a as_o well_o by_o the_o nature_n of_o the_o thing_n as_o by_o what_o have_v be_v demonstrate_v by_o archimedes_n and_o his_o commentator_n that_o the_o great_a force_n will_v prevail_v against_o the_o lesser_a and_o that_o that_o part_n of_o the_o water_n surface_n must_v give_v way_n where_o it_o be_v least_o press_v so_o that_o that_o wherein_o the_o hypothesis_n i_o venture_v to_o propose_v to_o you_o differ_v from_o that_o which_o i_o dissent_v from_o be_v not_o that_o i_o be_v less_o mechanical_a but_o partly_o in_o this_o that_o whereas_o the_o hypothesis_n i_o question_v suppose_v a_o necessity_n of_o the_o protrusion_n or_o impulse_n of_o the_o air_n i_o do_v not_o require_v that_o supposition_n but_o be_v more_o general_a reach_v to_o other_o way_n of_o procure_v the_o ascension_n of_o liquor_n without_o raise_v they_o by_o the_o impulse_n of_o the_o air_n and_o partly_o and_o indeed_o chief_o in_o that_o the_o hypothesis_n i_o decline_v make_v the_o cause_n of_o the_o ascension_n of_o liquor_n to_o be_v only_o the_o increase_a pressure_n of_o the_o air_n external_a to_o the_o pipe_n and_o i_o chief_o make_v it_o to_o depend_v upon_o the_o diminish_v pressure_n of_o the_o air_n within_o the_o pipe_n on_o the_o score_n of_o the_o expansion_n
cavity_n be_v near_o about_o a_o inch_n in_o diameter_n such_o a_o determinate_a breadth_n be_v convenient_a though_o not_o necessary_a to_o one_o of_o the_o end_n of_o this_o pipe_n we_o cause_v to_o be_v firm_o tie_v on_o a_o piece_n of_o very_o fine_a bladder_n that_o have_v be_v ruffle_v and_o oil_v to_o make_v it_o both_o very_a limber_a and_o unapt_a to_o admit_v water_n and_o care_n be_v take_v that_o the_o piece_n of_o bladder_n tie_v on_o â—hould_v be_v large_a enough_o not_o only_o to_o cover_v the_o orifice_n but_o to_o hang_v loose_a somewhat_o beneath_o it_o this_o do_v we_o put_v the_o cover_a end_n of_o the_o pipe_n into_o a_o glass-body_n or_o cucurbit_n purposely_o make_v more_o than_o ordinary_o tall_a and_o the_o pipe_n be_v hold_v in_o such_o manner_n as_o that_o the_o end_n of_o it_o reach_v almost_o but_o not_o quite_o to_o the_o bottom_n of_o the_o glass-body_n we_o cause_v water_n to_o be_v pour_v both_o into_o this_o vessel_n and_o into_o the_o pipe_n at_o its_o upper_a orifice_n which_o be_v leave_v open_a that_o the_o water_n may_v ascend_v equal_o enough_o both_o without_o and_o within_o the_o pipe_n and_o when_o the_o glass-body_n be_v full_a of_o water_n and_o the_o same_o liquor_n be_v level_a to_o it_o or_o a_o little_a high_o within_o the_o pipe_n the_o bladder_n at_o the_o low_a orifice_n be_v keep_v plump_a because_o the_o water_n within_o the_o pipe_n do_v by_o its_o weight_n press_v as_o forcible_o downward_o as_o the_o external_a water_n in_o the_o large_a glass_n endeavour_v to_o press_v it_o inward_o and_o upward_o all_o this_o be_v do_v we_o cause_v part_n of_o the_o water_n in_o the_o pipe_n to_o be_v â—aken_v out_o of_o it_o which_o may_v be_v do_v either_o by_o put_v in_o and_o draw_v out_o a_o piece_n of_o sponge_n or_o of_o linen_n or_o more_o expeditious_o by_o suck_v up_o part_n of_o the_o water_n with_o a_o small_a pipe_n to_o be_v immediate_o after_o lay_v aside_o upon_o which_o removal_n of_o part_n of_o the_o internal_a water_n that_o which_o remain_v in_o the_o pipe_n be_v no_o long_o able_a by_o reason_n of_o its_o want_n of_o weight_n to_o press_v against_o the_o inside_n of_o the_o bladder_n near_o as_o forcible_o as_o it_o do_v before_o the_o external_a water_n who_o weight_n be_v not_o lessen_v press_v the_o side_n and_o bottom_n of_o the_o bladder_n whereto_o it_o be_v contiguous_a into_o the_o cavity_n of_o the_o pipe_n and_o thru_v it_o up_o therein_o so_o strong_o that_o the_o distend_v bladder_n make_v a_o kind_n of_o either_o thimble_n or_o hemisphere_n within_o the_o pipe_n so_o that_o here_o we_o have_v a_o protuberance_n like_o that_o abovementioned_a of_o the_o finger_n effect_v by_o pulsion_n not_o attractionâ—_n and_o in_o a_o case_n where_o there_o can_v be_v no_o just_a pretence_n of_o have_v â—â—course_n to_o nature_n abhorrance_n of_o a_o vacuum_n since_o the_o upper_a orifice_n of_o the_o pipe_n be_v leave_v wide_o open_a the_o air_n may_v pass_v in_o and_o out_o without_o resistance_n the_o like_a swell_a of_o the_o bladder_n in_o the_o pipe_n we_o can_v procure_v without_o take_v out_o any_o of_o the_o internal_a liquor_n by_o thrust_v the_o pipe_n deep_o into_o the_o water_n for_o then_o the_o external_a liquor_n have_v by_o reason_n of_o its_o increase_n of_o depth_n a_o great_a pressure_n on_o the_o outside_n of_o the_o bladder_n than_o the_o internal_a liquor_n have_v on_o the_o inside_n of_o it_o the_o bladder_n must_v yield_v to_o the_o strong_a pressure_n and_o consequent_o be_v impel_v up_o if_o the_o bladder_n lie_v loof_o at_o the_o low_a end_n of_o the_o pipe_n the_o upper_a end_n be_v careful_o close_v with_o one_o thumb_n that_o the_o upper_a air_n may_v not_o get_v out_o until_o the_o experimentor_n think_v fit_a and_o if_o the_o thus_o close_v pipe_n be_v thrust_v almost_o to_o the_o bottom_n of_o the_o water_n the_o bladder_n will_v not_o be_v protuberant_a inward_o as_o former_o because_o the_o include_v air_n by_o virtue_n of_o its_o spring_n resist_v from_o within_o the_o pressure_n of_o the_o external_a water_n against_o the_o outside_n of_o the_o bladder_n but_o if_o the_o thumb_n that_o stop_v the_o pipe_n upper_a orifice_n be_v remove_v the_o former_o compress_v air_n have_v liberty_n to_o expand_v itself_o and_o its_o elasticity_n be_v weaken_a thereby_o the_o external_a water_n will_v with_o suddenness_n and_o noise_n enough_o not_o to_o be_v unpleasant_a to_o the_o spectator_n drive_v up_o the_o bladder_n into_o the_o cavity_n of_o the_o pipe_n and_o keep_v it_o there_o very_o protuberant_a to_o obviate_v a_o objection_n that_o i_o foresee_v may_v be_v bring_v in_o by_o person_n not_o well_o verse_v in_o hydrostaticks_n i_o cause_v the_o pipe_n forementioned_a or_o such_o another_o to_o be_v so_o bend_v near_o the_o low_a end_n as_o that_o the_o orifice_n of_o it_o stand_v quite_o on_o one_o side_n and_o the_o part_n of_o the_o pipe_n make_v a_o angle_n as_o near_o to_o a_o right_a one_o as_o he_o that_o blow_v it_o can_v bring_v it_o to_o this_o low_a orifice_n be_v fit_v with_o a_o bladder_n and_o the_o pipe_n with_o its_o contain_v liquor_n be_v thrust_v under_o water_n after_o the_o former_a manner_n the_o lateral_a pressure_n of_o the_o water_n force_v the_o bladder_n into_o the_o short_a and_o horizontal_a leg_n and_o make_v it_o protuberate_v there_o as_o it_o have_v do_v when_o the_o pipe_n be_v straight_o last_o that_o the_o experiment_n may_v appear_v not_o to_o be_v confine_v to_o one_o liquor_n instead_o of_o water_n we_o put_v into_o the_o unbend_v pipe_n as_o much_o red_a wine_n whoâ—e_a colour_n will_v make_v it_o conspicuous_a as_o be_v requisite_a to_o keep_v the_o bladder_n somewhat_o swell_v outward_o when_o it_o be_v somewhat_o near_o the_o bottom_n of_o the_o water_n and_o than_o it_o be_v manifest_a that_o according_a as_o we_o have_v foresee_v the_o superficies_n of_o the_o red_a liquor_n in_o the_o pipe_n be_v a_o good_a deal_n high_o than_o that_o of_o the_o external_a water_n and_o if_o the_o depth_n of_o both_o liquor_n be_v proportionable_o lessen_v the_o difference_n of_o height_n betwixt_o the_o two_o surface_n will_v indeed_o as_o it_o ought_v to_o happen_v decrease_v but_o still_o the_o surface_n of_o the_o wine_n will_v be_v the_o high_a of_o the_o two_o because_o be_v light_a in_o specie_fw-la than_o the_o common_a water_n the_o aequilibrium_fw-la between_o the_o pressure_n of_o the_o two_o liquor_n upon_o the_o bladder_n will_v not_o be_v maintain_v unless_o a_o great_a height_n of_o wine_n compensated_a its_o defect_n of_o specific_a gravity_n and_o if_o the_o pipe_n be_v thrust_v deep_a into_o the_o water_n than_o the_o bladder_n will_v be_v make_v protuberant_a inward_o as_o when_o the_o pipe_n have_v water_n in_o it_o by_o which_o it_o appear_v that_o these_o phaenomena_n without_o recourse_n to_o attraction_n may_v be_v explicate_v bare_o by_o the_o law_n of_o the_o aequilibrium_fw-la of_o liquor_n finis_fw-la new_a experiment_n about_o the_o preservation_n of_o body_n in_o vacuo_fw-la boyliano_n by_o the_o honourable_a robert_n boyle_n fellow_n of_o the_o royal_a society_n london_n print_v by_o william_n godbid_v and_o be_v to_o be_v sell_v by_o moses_n pitt_n at_o the_o angel_n over_o against_o the_o little_a north_n door_n of_o st._n paul_n church_n 1674._o preface_n my_o willingness_n to_o make_v the_o bulk_n of_o the_o paper_n about_o the_o hide_a quality_n of_o the_o air_n less_o inconsiderable_a by_o thing_n that_o be_v of_o affinity_n to_o the_o subject_a induce_v i_o to_o tumble_v over_o some_o of_o my_o adversaria_fw-la i_o meet_v among_o they_o with_o divers_a loose_a note_n or_o short_a memorial_n of_o some_o experiment_n i_o make_v several_a year_n ago_o and_o some_o of_o a_o fresh_a date_n about_o the_o preservation_n of_o body_n by_o exclude_v the_o air_n wherefore_o i_o be_v easy_o persuade_v to_o subjoin_v these_o to_o the_o additional_a experiment_n last_v recite_v for_o it_o seem_v not_o yet_o clear_a by_o what_o manifest_a quality_n the_o exclusion_n of_o the_o air_n shall_v so_o much_o contribute_v to_o keep_v from_o putrefaction_n variety_n of_o body_n that_o be_v usual_o find_v very_o much_o dispose_v to_o it_o and_o therefore_o till_o the_o cause_n of_o this_o preservation_n be_v further_o pâ—â—â—â—â—ated_v it_o may_v not_o be_v altogether_o impertinent_a to_o mention_v some_o experiment_n relate_v to_o it_o and_o though_o these_o be_v only_o such_o as_o come_v now_o to_o hand_n and_o be_v most_o of_o they_o set_v down_o rather_o as_o note_n than_o relation_n yet_o be_v faithful_o register_v and_o most_o of_o they_o have_v be_v make_v in_o vacuo_fw-la boyliano_n as_o they_o call_v it_o they_o will_v problable_o be_v new_a and_o so_o perhaps_o not_o altogether_o useless_a to_o naturalist_n who_o may_v