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remain_v above_o twenty_o four_o hour_n in_o the_o receiver_n we_o afterward_o repeat_v the_o experiment_n to_o try_v what_o change_n the_o exsuction_n of_o the_o external_a air_n will_v produce_v in_o the_o water_n after_o the_o internal_a and_o latitant_fw-la air_n have_v as_o be_v above_o recite_v in_o great_a measure_n get_v away_o in_o bubble_n and_o whether_o or_o no_o the_o water_n will_v by_o stand_v re-admit_a any_o new_a particle_n of_o air_n in_o the_o room_n of_o those_o that_o have_v forsake_v it_o but_o though_o we_o exhaust_v the_o receiver_n very_o diligent_o yet_o we_o scarce_o see_v a_o bubble_n in_o either_o of_o the_o glass_n notwithstanding_o which_o we_o perceive_v the_o water_n to_o rise_v about_o the_o breadth_n of_o a_o barleycorn_n or_o more_o in_o the_o neck_n of_o that_o glass_n wherein_o the_o solid_a cylinder_n have_v be_v put_v the_o liquor_n in_o the_o other_o glass_n not_o sensible_o swell_v and_o last_o upon_o the_o let_n in_o of_o the_o air_n the_o water_n in_o the_o straighten_v neck_n soon_o subside_v to_o the_o mark_n above_o which_o it_o have_v swell_v which_o whether_o it_o ought_v to_o be_v ascribe_v to_o the_o same_o small_a expansion_n of_o the_o part_n of_o the_o water_n itself_o or_o to_o the_o rarifaction_n of_o some_o yet_o latitant_fw-la air_n break_a into_o such_o small_a particle_n as_o to_o escape_v our_o observation_n seem_v not_o easy_o determinable_a without_o such_o further_a trial_n as_o will_v perhaps_o prove_v tedious_a to_o be_v recite_v as_o well_o as_o to_o be_v make_v though_o i_o be_v content_a to_o set_v down_o those_o already_o mention_v that_o it_o may_v appear_v how_o requisite_a it_o be_v in_o nice_a experiment_n to_o consider_v variety_n of_o circumstance_n after_o have_v thus_o discover_v what_o operation_n the_o exsuction_n of_o the_o ambient_fw-la air_n have_v upon_o water_n
press_v on_o the_o bladder_n the_o internal_a air_n not_o find_v the_o wont_a resistance_n first_o swell_v and_o distend_v the_o bladder_n and_o then_o break_v it_o with_o so_o wide_a and_o crooked_a a_o rent_n as_o if_o it_o have_v be_v forcible_o tear_v asunder_o with_o hand_n after_o which_o a_o second_o bladder_n be_v convey_v in_o the_o experiment_n be_v repeat_v with_o like_a success_n and_o i_o suppose_v it_o will_v not_o be_v imagine_v that_o in_o this_o case_n the_o bladder_n be_v break_v by_o its_o own_o fibre_n rather_o than_o by_o the_o imprison_v air._n and_o of_o this_o experiment_n these_o two_o phaenomena_n may_v be_v take_v notice_n of_o the_o one_o that_o the_o bladder_n at_o its_o break_n give_v a_o great_a report_n almost_o like_o a_o craker_n and_o the_o other_o that_o the_o air_n contain_v in_o the_o bladder_n have_v the_o power_n to_o break_v it_o with_o the_o mention_a impetuosity_n long_o before_o the_o ambient_fw-la air_n be_v all_o or_o near_o all_o draw_v out_o of_o the_o receiver_n but_o to_o verify_v what_o we_o say_v in_o another_o discourse_n where_o we_o show_v that_o even_o true_a experiment_n may_v by_o reason_n of_o the_o easy_a mistake_n of_o some_o unheeded_a circumstance_n be_v unsuccessful_o try_v we_o will_v advertise_v on_o this_o occasion_n that_o we_o do_v oftentimes_o in_o vain_a try_v the_o break_n of_o bladder_n after_o the_o manner_n abovementioned_a of_o which_o the_o cause_n appear_v to_o be_v this_o that_o the_o bladder_n we_o can_v not_o break_v have_v be_v bring_v we_o ready_a blow_v from_o those_o that_o sell_v they_o be_v grow_v dry_a before_o they_o come_v to_o our_o hand_n whence_o it_o come_v to_o pass_v that_o if_o we_o afterward_o tie_v they_o very_o hard_o they_o be_v apt_a to_o fret_v and_o so_o become_v unserviceable_a and_o if_o we_o tie_v they_o but_o moderate_o hard_a their_o stiffness_n keep_v they_o from_o be_v close_v so_o exact_o but_o that_o when_o the_o include_v air_n have_v in_o the_o exhaust_a receiver_n distend_v they_o as_o much_o as_o easy_o it_o can_v it_o will_v in_o part_n get_v out_o between_o the_o little_a wrinkle_n of_o the_o sphincter_n of_o tâ—e_v neck_n whence_o also_o it_o usual_o happen_v that_o upon_o the_o let_n in_o the_o air_n from_o without_o the_o bladder_n appear_v more_o flaccid_a and_o empty_a then_o before_o they_o be_v put_v in_o whereas_o when_o the_o bladder_n be_v bring_v we_o moist_a from_o the_o butcher_n we_o can_v without_o injure_v they_o tie_v their_o neck_n so_o close_o that_o none_o of_o the_o air_n once_o blow_v in_o can_v get_v out_o of_o they_o but_o by_o violent_o break_v they_o it_o will_v not_o be_v amiss_o on_o this_o occasion_n to_o point_n at_o something_o which_o may_v deserve_v a_o more_o deliberate_a speculation_n than_o we_o can_v now_o afford_v it_o namely_o that_o the_o elastical_a power_n of_o the_o sâ—me_a quantity_n of_o air_n may_v be_v as_o well_o increase_v by_o the_o agitation_n of_o the_o aërial_a particle_n whether_o only_o move_v they_o more_o swift_o and_o scatter_v they_o or_o also_o extend_v or_o stretch_v they_o out_o i_o determine_v not_o within_o a_o every_o way_n enclose_v and_o yet_o yield_a body_n as_o display_v by_o the_o withdraw_n of_o the_o air_n that_o press_v it_o without_o for_o we_o find_v that_o a_o bladder_n but_o moderate_o fill_v with_o air_n and_o strong_o tie_v be_v a_o while_n hold_v near_o the_o fire_n not_o only_o grow_v exceed_v turgid_a and_o hard_a but_o afterward_o be_v approach_v near_o to_o the_o fire_n sudden_o break_v with_o so_o loud_a and_o vehement_a a_o noise_n as_o stony_v those_o that_o be_v by_o and_o make_v we_o for_o a_o while_n after_o almost_o deaf_a 6._o experiment_n 6._o have_v thus_o see_v that_o the_o air_n have_v a_o elastical_a power_n we_o be_v next_o desirous_a to_o know_v in_o some_o measure_n how_o far_o a_o parcel_n of_o air_n may_v by_o this_o its_o own_o spring_n be_v dilate_v and_o though_o we_o be_v not_o provide_v of_o instrument_n fit_a to_o measure_v the_o dilatation_n of_o the_o air_n any_o thing_n accurate_o yet_o because_o a_o imperfect_a measure_n of_o it_o be_v more_o desirable_a than_o none_o at_o all_o we_o devise_v the_o follow_a method_n as_o very_o easy_o practicable_a we_o take_v a_o limber_a lamb_n bladder_n which_o be_v thorough_o wet_v in_o fair_a water_n that_o the_o side_n of_o it_o be_v squeeze_v together_o there_o may_v be_v no_o air_n leave_v in_o its_o fold_n as_o indeed_o we_o can_v not_o afterward_o upon_o trial_n discern_v any_o the_o neck_n of_o this_o bladder_n be_v strong_o tie_v about_o that_o of_o a_o small_a glass_n capable_a of_o hold_v five_o full_a drachma_n of_o water_n the_o bladder_n be_v first_o so_o compress_v that_o all_o the_o include_v air_n be_v only_o in_o the_o glass_n without_o be_v press_v there_o then_o the_o pump_n be_v set_v a-work_o after_o a_o few_o exsuction_n the_o air_n in_o the_o little_a viol_n begin_v to_o dilate_v itself_o and_o produce_v a_o small_a tumour_n in_o the_o neck_n of_o the_o bladder_n and_o as_o the_o ambient_fw-la air_n be_v more_o and_o more_o draw_v away_o so_o the_o include_v air_n penetrate_v further_o and_o further_o into_o the_o bladder_n and_o by_o degree_n lift_v up_o the_o side_n and_o display_v its_o fold_n till_o at_o length_n it_o seem_v to_o have_v blow_v it_o up_o to_o its_o full_a extent_n whereupon_o the_o external_a air_n be_v permit_v to_o flow_v back_o into_o the_o reciver_n repulse_v the_o air_n that_o have_v fill_v the_o bladder_n into_o its_o former_a narrow_a receptacle_n and_o bring_v the_o bladder_n to_o be_v again_o flaccid_a and_o wrinkle_a as_o before_o then_o take_v out_o the_o bladder_n but_o without_o sever_n it_o from_o the_o glass_n we_o do_v by_o a_o hole_n make_v at_o the_o top_n of_o the_o bladder_n fill_v the_o vessel_n they_o both_o make_v up_o with_o water_n who_o weight_n be_v five_o ounce_n five_o drachma_n and_o a_o half_a five_o drachma_n whereof_o be_v abovementioned_a to_o be_v the_o content_n of_o the_o bottle_n so_o that_o in_o this_o experiment_n when_o the_o air_n have_v most_o extend_v the_o bladder_n it_o possess_v in_o all_o above_o nine_o time_n as_o much_o room_n as_o it_o do_v when_o it_o be_v put_v into_o the_o receiver_n and_o it_o will_v probable_o have_v much_o enlarge_v its_o bound_n but_o that_o the_o bladder_n by_o its_o weight_n and_o the_o stick_v together_o of_o its_o side_n do_v somewhat_o resist_v its_o expansion_n and_o which_o be_v more_o considerable_a the_o bladder_n appear_v tumid_a enough_o whilst_o yet_o a_o pretty_a deal_n of_o air_n be_v leave_v in_o the_o receiver_n who_o exsuction_n will_v according_a to_o our_o former_a observation_n probable_o have_v give_v way_n to_o a_o further_a expansion_n of_o the_o air_n especial_o suppose_v the_o dilatation_n not_o to_o be_v restrain_v by_o the_o bladder_n since_o we_o write_v the_o other_o day_n the_o former_a experiment_n we_o have_v meet_v with_o some_o glass_n not_o very_o unfit_a for_o our_o purpose_n by_o mean_n of_o which_o we_o be_v now_o able_a with_o a_o little_a more_o trouble_n to_o measure_v the_o expansion_n of_o the_o air_n a_o great_a deal_n more_o accurate_o than_o we_o can_v by_o the_o help_n of_o the_o abovementioned_a bladder_n which_o be_v much_o to_o narrow_a to_o allow_v the_o air_n its_o utmost_a distension_n we_o take_v then_o first_o a_o cylindrical_a pipe_n of_o glass_n who_o bore_n be_v about_o a_o quarter_n of_o a_o inch_n in_o diameter_n this_o pipe_n be_v so_o bend_v and_o double_v that_o notwithstanding_o its_o be_v about_o two_o foot_n in_o length_n it_o may_v have_v be_v shut_v up_o into_o a_o small_a receiver_n not_o a_o foot_n high_a but_o by_o misfortune_n it_o crack_v in_o the_o cool_a whereby_o we_o be_v reduce_v to_o make_v use_n of_o one_o part_v which_o be_v straight_o and_o entire_a but_o exceed_v not_o six_o or_o seven_o inch_n this_o little_a tube_n be_v open_a at_o one_o end_n and_o at_o the_o other_o where_o it_o be_v hermetical_o seal_v have_v a_o small_a glass_n bubble_n to_o receive_v the_o air_n who_o dilatation_n be_v to_o be_v measure_v along_o the_o side_n of_o this_o tube_n be_v past_v a_o straight_a narrow_a piece_n of_o parchment_n divide_v into_o twenty_o six_o equal_a part_n mark_v with_o black_a line_n and_o figure_n that_o by_o they_o may_v be_v measure_v both_o the_o include_v air_n and_o its_o dilatation_n afterward_o we_o fill_v the_o tube_n with_o water_n almost_o to_o the_o top_n and_o stop_v the_o open_a end_n with_o a_o finger_n and_o invert_v the_o tube_n the_o air_n be_v permit_v to_o ascend_v to_o the_o abovementioned_a glass_n bubble_n and_o by_o reason_n this_o ascent_n be_v very_o slow_a it_o give_v we_o the_o opportunity_n to_o mark_v how_o
much_o more_o or_o less_o than_o one_o of_o the_o twenty_o six_o division_n this_o air_n take_v up_o by_o this_o mean_n after_o a_o trial_n or_o two_o we_o be_v enable_v to_o convey_v to_o the_o top_n of_o the_o glass_n a_o bubble_n of_o air_n equal_a enough_o as_o to_o sight_n to_o one_o of_o those_o division_n then_o the_o open_a end_n of_o the_o tube_n be_v put_v into_o a_o small_a viol_n who_o bottom_n be_v cover_v with_o water_n about_o half_a a_o inch_n high_a we_o include_v both_o glass_n into_o a_o small_a and_o slender_a receiver_n and_o cause_v the_o pump_n to_o be_v set_v a-work_o the_o event_n be_v that_o at_o the_o first_o exsuction_n of_o the_o air_n there_o appear_v not_o any_o expansion_n of_o the_o bubble_n comparable_a to_o what_o appear_v at_o the_o second_o and_o that_o upon_o a_o very_a few_o exsuction_n the_o bubble_n reach_v as_o low_a as_o the_o surface_n of_o the_o subjacent_a water_n give_v we_o cause_n to_o think_v that_o if_o our_o pipe_n have_v not_o be_v break_v it_o will_v have_v expanded_a itself_o much_o further_o wherefore_o we_o take_v out_o the_o little_a tube_n and_o find_v that_o beside_o the_o twenty_o six_o division_n former_o mention_v the_o glass_n bubble_n and_o some_o part_n of_o the_o pipe_n to_o which_o the_o divide_a parchment_n do_v not_o reach_v amount_v to_o six_o division_n more_o whereby_o it_o appear_v that_o the_o air_n have_v take_v up_o one_o and_o thirty_o time_n as_o much_o room_n as_o before_o and_o yet_o seem_v capable_a of_o a_o much_o great_a expansion_n if_o the_o glass_n will_v have_v permit_v it_o wherefore_o after_o the_o former_a manner_n we_o let_v in_o another_o bubble_n that_o by_o our_o guess_n be_v but_o half_a as_o big_a as_o the_o former_a and_o find_v that_o upon_o the_o exsuction_n of_o the_o air_n from_o the_o receiver_n this_o little_a bubble_n do_v not_o only_o fill_v up_o the_o whole_a tube_n but_o in_o part_n break_v through_o the_o subjacent_a water_n in_o the_o viol_n and_o thereby_o 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the_o expansion_n of_o the_o air_n may_v not_o be_v resist_v by_o the_o neighbour_a body_n it_o will_v yet_o enlarge_v its_o bound_n and_o perhaps_o stretch_v itself_o to_o two_o hundred_o time_n its_o former_a bulk_n if_o not_o more_o however_o what_o we_o have_v now_o try_v will_n i_o hope_v suffice_v to_o hinder_v divers_a of_o the_o phaenomena_n of_o our_o engine_n from_o be_v disinherit_v since_o in_o that_o part_n of_o the_o atmosphere_n we_o live_v in_o that_o which_o we_o call_v the_o free_a air_n and_o presume_v to_o be_v so_o uncompress_v be_v crowd_v into_o so_o very_a small_a a_o part_n of_o that_o space_n which_o if_o it_o be_v not_o hinder_v
a_o barleycorn_n in_o the_o neck_n of_o the_o glass_n and_o so_o attain_v by_o degree_n to_o a_o considerable_a height_n above_o the_o mark_n former_o mention_v and_o at_o length_n to_o make_v the_o expansion_n of_o the_o water_n more_o evident_a the_o outward_a air_n be_v sudden_o let_v in_o and_o the_o water_n immediate_o subside_v and_o desert_v all_o the_o space_n it_o have_v new_o gain_v in_o the_o glass_n and_o on_o this_o occasion_n it_o will_v not_o perhaps_o be_v amiss_o to_o acquaint_v your_o lordship_n here_o though_o we_o have_v already_o mention_v it_o in_o another_o paper_n to_o another_o purpose_n with_o another_o expedient_a that_o we_o make_v use_v of_o two_o or_o three_o year_n ago_o to_o try_v whether_o or_o no_o water_n have_v a_o spring_n in_o it_o about_o that_o time_n then_o that_o great_a and_o learned_a promoter_n of_o experimental_a philosophy_n dr._n wilkins_n do_v i_o the_o honour_n to_o come_v himself_o and_o bring_v some_o of_o his_o inquisitive_a friend_n 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in_o it_o in_o order_n to_o the_o satisfy_n myself_o about_o the_o first_o of_o these_o i_o intend_v to_o let_v down_o into_o the_o receiver_n a_o vessel_n of_o water_n wherein_o shall_v be_v immerse_v a_o very_a small_a oil_a bladder_n almost_o devoid_a of_o air_n but_o strong_o tie_v up_o at_o the_o neck_n with_o a_o string_n and_o detain_v a_o little_a under_o water_n by_o such_o a_o weight_n fasten_v to_o that_o string_n as_o shall_v just_o be_v able_a to_o keep_v the_o bladder_n from_o swim_v and_o no_o more_o for_o i_o suppose_v that_o if_o when_o all_o thing_n be_v thus_o order_v the_o receiver_n be_v empty_v in_o case_n there_o be_v any_o such_o pressure_n of_o the_o atmosphere_n upon_o water_n as_o i_o be_v incline_v to_o believe_v the_o air_n within_o the_o bladder_n be_v upon_o the_o exsuction_n of_o the_o air_n within_o the_o receiver_n free_v from_o that_o pressure_n and_o be_v press_v only_o by_o the_o small_a weight_n of_o the_o incumbent_a water_n will_v considerable_o 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it_o contain_v amount_v to_o one_o and_o twenty_o ounce_n and_o a_o half_a and_o as_o much_o air_n as_o be_v requisite_a to_o fill_v it_o weigh_v eleven_o grain_n the_o proportion_n in_o gravity_n of_o air_n to_o water_n of_o the_o same_o bulk_n will_v be_v as_o one_o to_o 938._o and_o though_o we_o can_v not_o fill_v the_o aeolipile_n with_o water_n so_o exact_o as_o we_o will_v yet_o in_o regard_n we_o can_v not_o either_o as_o perfect_o as_o we_o will_v drive_v the_o air_n out_o of_o it_o by_o heat_n we_o think_v the_o proportion_n may_v well_o enough_o hold_v but_o those_o that_o be_v delight_v with_o round_a number_n as_o the_o phrase_n be_v will_v not_o be_v much_o mistake_v if_o they_o reckon_v water_n to_o be_v near_o a_o thousand_o time_n heavy_a than_o air._n and_o for_o further_a proof_n that_o we_o have_v make_v the_o proportion_n betwixt_o these_o two_o body_n rather_o great_a then_o lesser_a than_o indeed_o it_o be_v and_o also_o to_o confirm_v our_o former_a 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as_o lose_v its_o aequilibrium_fw-la by_o the_o hundred_o part_n of_o a_o grain_n but_o because_o there_o be_v wont_a to_o be_v commit_v a_o oversight_n in_o weigh_v quicksilver_n and_o water_n especial_o if_o the_o orifice_n of_o the_o vessel_n wherein_o they_o be_v put_v be_v any_o thing_n wide_a in_o regard_n that_o man_n heed_v not_o that_o the_o surface_n of_o water_n in_o vessel_n will_v be_v concave_a but_o that_o of_o quicksilver_n notable_o convex_a or_o protuberant_a to_o avoid_v this_o usual_a oversight_n i_o say_v we_o make_v use_v of_o a_o glass_n bubble_n blow_v very_o thin_a at_o the_o flame_n of_o a_o lamp_n that_o it_o may_v not_o be_v too_o heavy_a for_o the_o balance_n and_o terminate_n in_o a_o very_a slender_a neck_n wherein_o the_o concavity_n or_o convexity_n
themselves_o such_o than_o it_o be_v whilst_o the_o wont_a pressure_n of_o the_o air_n continue_v unremoved_a it_o may_v indeed_o be_v suspect_v that_o those_o vast_a &_o numerous_a bubble_n proceed_v not_o from_o the_o action_n of_o the_o menstruum_fw-la upon_o the_o coral_n but_o from_o the_o sudden_a emersion_n of_o those_o many_o little_a parcel_n of_o air_n that_o as_o we_o former_o observe_v be_v wont_a to_o be_v disperse_v in_o liquor_n without_o exclude_v spirit_n of_o vinegar_n but_o have_v have_v this_o suspicion_n before_o we_o try_v the_o experiment_n we_o convey_v our_o distil_a vinager_n alone_o into_o the_o receiver_n and_o keep_v it_o awhile_o there_o to_o free_v it_o from_o its_o bubble_n which_o be_v but_o very_o small_a before_o ever_o we_o put_v the_o coral_n into_o it_o it_o may_v be_v suspect_v likewise_o that_o the_o agitation_n of_o the_o liquor_n necessary_a follow_v upon_o the_o shake_n of_o the_o glass_n by_o pump_v may_v occasion_v the_o recite_v 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notice_n of_o in_o common_a water_n then_o almost_o fill_v with_o it_o a_o glass_n viol._n capable_a of_o contain_v near_o four_o ounce_n of_o that_o liquor_n we_o convey_v it_o while_o the_o water_n be_v yet_o hot_a into_o one_o of_o our_o small_a receiver_n big_a enough_o to_o hold_v about_o a_o pound_n of_o water_n and_o have_v lute_v on_o the_o cover_n we_o cause_v the_o air_n to_o be_v draw_v out_o upon_o the_o two_o first_o exsuction_n there_o scarce_o appear_v any_o change_n in_o the_o liquor_n nor_o be_v there_o any_o notable_a alteration_n make_v by_o the_o three_o but_o at_o the_o four_o and_o afterward_o the_o water_n appear_v to_o boil_v in_o the_o viol_n as_o if_o it_o have_v stand_v over_o a_o very_a quick_a fire_n for_o the_o bubble_n be_v much_o great_a than_o be_v usual_o find_v upon_o the_o ebullition_n of_o very_a much_o more_o water_n than_o be_v contain_v in_o our_o viol._n and_o this_o effervescence_n be_v so_o great_a in_o the_o upper_a part_n of_o the_o water_n that_o the_o liquor_n boil_v over_o the_o top_n of_o the_o neck_n a_o pretty_a deal_n of_o it_o run_v down_o into_o the_o receiver_n and_o sometime_o continue_v though_o more_o languid_o boil_v there_o prosecute_a this_o experiment_n we_o observe_v that_o sometime_o after_o the_o first_o ebullition_n we_o be_v reduce_v to_o make_v divers_a exsuction_n of_o the_o air_n before_o the_o liquor_n will_v be_v bring_v to_o boil_v again_o but_o at_o other_o time_n as_o often_o as_o the_o key_n be_v turn_v to_o let_v the_o air_n pass_v from_o the_o receiver_n into_o the_o pump_n the_o effervescence_n will_v begin_v afresh_o though_o the_o pump_n be_v ply_v for_o a_o pretty_a while_n together_o which_o seem_v to_o argue_v that_o the_o boil_a of_o the_o water_n proceed_v from_o hence_o that_o upon_o the_o withdraw_a the_o pressure_n of_o the_o incumbent_a air_n either_o the_o fiery_a corpuscle_n or_o rather_o the_o vapour_n agitate_a by_o the_o heat_n in_o the_o water_n which_o last_o what_o we_o 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in_o the_o viol_n can_v by_o no_o pump_v be_v bring_v to_o boil_v any_o more_o the_o selfsame_a water_n be_v in_o the_o very_a same_o viol_n warm_v again_o and_o reconvey_v into_o the_o pneumatical_a glass_n be_v quick_o bring_v to_o boil_v afresh_o and_o that_o vehement_o and_o long_o enough_o not_o to_o mention_v that_o a_o new_a parcel_n take_v out_o of_o the_o same_o parcel_n of_o the_o boil_a water_n with_o the_o former_a and_o put_v in_o cold_a can_v by_o no_o pump_v be_v bring_v to_o the_o least_o show_n of_o effervescence_n beside_o have_v try_v this_o experiment_n in_o hot_a salad_n oil_n be_v a_o much_o more_o tenacious_a liquor_n and_o require_v a_o strong_a heat_n to_o make_v it_o boil_v can_v not_o be_v bring_v to_o a_o effervescence_n in_o our_o reciver_n whereas_o the_o chemical_a oil_n of_o turpentine_n be_v thin_a and_o more_o volatile_a be_v present_o make_v to_o boil_v up_o till_o it_o reach_v four_o or_o five_o time_n its_o former_a height_n in_o the_o viol_n in_o who_o bottom_n it_o lay_v and_o continue_v boil_v till_o it_o be_v almost_o reduce_v to_o be_v but_o lukewarm_a wine_n also_o be_v a_o more_o thin_a and_o spirituous_a liquor_n than_o water_n be_v convey_v in_o hot_a instead_o of_o the_o oil_n do_v as_o i_o remember_v at_o the_o very_a first_o exsuction_n begin_v to_o boil_v so_o vehement_o that_o in_o a_o short_a time_n that_o the_o pump_n be_v keep_v move_v four_o part_n of_o five_o by_o our_o guess_n boil_v over_o out_o of_o the_o viol_n though_o it_o have_v a_o pretty_a long_a neck_n on_o which_o occasion_n we_o will_v add_v that_o even_o the_o water_n itself_o near_o one_o half_a will_v sometime_o boil_v over_o into_o the_o receiver_n before_o it_o become_v lukewarm_a and_o it_o be_v also_o remarkable_a that_o once_o when_o the_o air_n have_v be_v draw_v out_o the_o liquor_n do_v upon_o a_o single_a exsuction_n boil_v so_o long_o with_o prodigious_o vast_a bubble_n that_o the_o effervescence_n last_v almost_o as_o long_o as_o be_v requisite_a for_o the_o rehearse_n of_o a_o pater_fw-la noster_fw-la now_o the_o experiment_n have_v be_v try_v more_o than_o once_o and_o find_v to_o succeed_v as_o to_o the_o main_a seem_v much_o to_o countenance_v the_o conjecture_n we_o make_v at_o the_o begin_n of_o this_o letter_n where_o we_o tell_v your_o lordship_n that_o perhaps_o the_o pressure_n of_o the_o air_n may_v have_v a_o interest_n in_o more_o phaenomena_n then_o man_n have_v hitherto_o think_v for_o as_o we_o have_v not_o then_o make_v this_o experiment_n so_o now_o we_o have_v make_v it_o it_o seem_v to_o teach_v that_o the_o air_n by_o its_o strong_a or_o weak_a pressure_n may_v very_o much_o modify_v as_o the_o schoolman_n speak_v divers_a of_o the_o operation_n of_o that_o vehement_a and_o tumultuous_a agitation_n of_o the_o small_a part_n of_o body_n
somewhat_o thick_a within_o who_o cavity_n it_o be_v imprison_v whereas_o air_n pen_v up_o and_o agitate_a by_o heat_n be_v able_a to_o perform_v so_o much_o more_o considerable_a effect_n that_o not_o to_o mention_v those_o of_o rarefaction_n that_o be_v more_o obvious_a the_o learned_a jesuit_n cabaeus_n he_o that_o write_v of_o the_o loadstone_n relate_v aristot_n p_o nicol_n cab_n lib_n 4._o metâ—oâ—_n aristot_n that_o he_o see_v a_o marble_n pillar_n so_o vast_a that_o three_o man_n together_o with_o display_v arm_n can_v not_o embrace_v it_o and_o that_o 1000_o yoke_n of_o ox_n draw_v it_o several_a way_n with_o all_o their_o strength_n can_v not_o have_v tear_v it_o asunder_o quite_o break_v off_o in_o the_o midst_n by_o reason_n of_o some_o wood_n which_o happen_v to_o be_v burn_v just_a by_o the_o pillar_n the_o heat_n proceed_v from_o the_o neighbour_a fire_n so_o rarefy_v some_o air_n or_o spirituous_a matter_n which_o be_v shut_v up_o in_o the_o cavity_n of_o the_o marble_n that_o it_o break_v through_o the_o solid_a body_n of_o the_o stone_n to_o obtain_v room_n to_o expand_v itself_o i_o remember_v i_o have_v take_v notice_n that_o probable_o the_o reason_n why_o the_o include_v air_n do_v not_o break_v the_o hermetical_o seal_a bubble_n that_o remain_v entire_a in_o our_o empty_v receiver_n be_v that_o the_o air_n be_v somewhat_o rarefy_v by_o the_o flame_n employ_v to_o close_v the_o glass_n its_o spring_n upon_o the_o recess_n of_o the_o heat_n grow_v weak_a than_o before_o but_o though_o we_o reject_v not_o that_o guess_n yet_o it_o will_v not_o in_o the_o present_a case_n serve_v the_o turn_n because_o that_o much_o small_a glass_n bubble_n exact_o close_v will_n by_o the_o include_v air_n though_o agitate_a but_o by_o the_o heat_n of_o a_o very_a moderate_a fire_n be_v make_v to_o fly_v in_o piece_n whether_o we_o may_v be_v assist_v to_o salve_v this_o problem_n by_o consider_v that_o the_o heat_n do_v from_o within_o vehement_o agitate_v the_o 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the_o external_a air_n be_v suffer_v to_o rush_v in_o which_o it_o do_v with_o some_o noise_n and_o then_o the_o aeolipile_n and_o wax_n be_v again_o weigh_v amount_v to_o six_o ounce_n six_o drachma_n and_o 50._o grain_n so_o that_o the_o aeolipile_v free_v as_o far_o as_o our_o fire_n can_v free_v it_o from_o its_o air_n weigh_v less_o than_o itself_o when_v replenish_v with_o air_n full_o eleven_o grain_n that_o be_v the_o air_n containable_a within_o the_o cavity_n of_o the_o aeolipile_n amount_v to_o eleven_o grain_n and_o somewhat_o more_o i_o say_v somewhat_o more_o because_o of_o the_o particle_n of_o the_o air_n that_o be_v not_o drive_v by_o the_o fire_n out_o of_o the_o aeolipile_n and_o by_o the_o way_n if_o there_o be_v no_o mistake_n in_o the_o observation_n of_o the_o diligent_a mersennus_n it_o may_v seem_v strange_a that_o it_o shall_v so_o much_o differ_v from_o 2._o or_o 3._o of_o we_o in_o none_o of_o which_o we_o can_v rarify_v the_o air_n in_o our_o aeolipile_n 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