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plane_n so_o to_o cut_v the_o sea-water_n as_o to_o pass_v by_o the_o divers_a body_n then_o as_o that_o part_n of_o the_o plane_n on_o which_o his_o body_n lean_v will_v be_v press_v by_o it_o together_o with_o the_o water_n that_o be_v perpendicular_o incumbent_a on_o it_o so_o all_o the_o other_o part_n of_o the_o same_o plane_n will_v be_v press_v by_o equal_o tall_a pillar_n of_o water_n perpendicular_o incumbent_a on_o they_o and_o consequent_o if_o the_o man_n body_n be_v just_o equiponderant_a to_o a_o equal_a bulk_n of_o water_n it_o and_o the_o water_n that_o lean_v on_o it_o will_v be_v sustain_v by_o the_o pressure_n of_o the_o collateral_a water_n incumbent_a on_o the_o other_o part_n of_o the_o same_o plane_n as_o may_v be_v easy_o understand_v by_o what_o i_o have_v elsewhere_o say_v paradox_n say_v see_v appendix_n to_o
the_o hydrost_n paradox_n and_o therefore_o there_o be_v no_o reason_n why_o the_o divers_a body_n shall_v be_v more_o forcible_o depress_v than_o its_o depression_n be_v resist_v it_o be_v true_a that_o this_o body_n will_v sink_v but_o that_o be_v because_o it_o be_v not_o only_a as_o we_o late_o suppose_v it_o aequiponderant_a to_o a_o equal_a bulk_n of_o water_n but_o heavy_a than_o that_o but_o then_o since_o the_o water_n by_o its_o gravity_n and_o resistance_n take_v off_o as_o much_o of_o the_o weight_n of_o the_o divers_a body_n whilst_o that_o be_v immerse_v as_o a_o quantity_n of_o water_n equal_a to_o it_o will_v weigh_v in_o the_o air_n the_o subside_v of_o the_o humane_a body_n by_o its_o own_o weight_n ought_v to_o be_v but_o slow_a because_o that_o be_v not_o in_o specie_fw-la much_o heavy_a than_o water_n it_o can_v sink_v but_o by_o virtue_n of_o the_o surplusage_n of_o weight_n that_o it_o have_v above_o water_n and_o in_o effect_n i_o have_v be_v inform_v by_o 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descend_v to_o the_o great_a depth_n of_o the_o sea_n which_o if_o they_o do_v perhaps_o they_o will_v find_v a_o notable_a difference_n and_o in_o small_a or_o but_o moderate_a depth_n those_o that_o dive_v without_o engine_n usual_o make_v such_o haste_n or_o be_v so_o confound_v or_o have_v their_o mind_n so_o intent_n upon_o their_o work_n that_o they_o take_v not_o notice_n of_o such_o lesser_a alteration_n as_o else_o they_o may_v observe_v especial_o they_o be_v person_n void_a of_o curiosity_n and_o skill_n to_o make_v such_o observation_n which_o i_o the_o rather_o mention_v because_o have_v meet_v with_o a_o learned_a physician_n that_o live_v by_o the_o seaside_n in_o a_o hot_a climate_n delight_v himself_o much_o in_o dive_v and_o inquire_v of_o he_o whether_o he_o feel_v no_o compression_n when_o he_o pass_v out_o of_o the_o air_n into_o the_o water_n he_o answer_v i_o that_o when_o he_o dive_v nimble_o as_o other_o use_v to_o do_v he_o take_v not_o notice_n of_o it_o 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the_o structure_n of_o a_o humane_a body_n and_o the_o uniformity_n of_o the_o pressure_n make_v by_o fluid_n of_o the_o first_o of_o these_o i_o shall_v add_v but_o little_a to_o what_o have_v be_v already_o say_v where_o i_o speak_v of_o the_o resistance_n make_v by_o our_o body_n to_o the_o compression_n of_o the_o atmosphere_n only_o shall_v here_o take_v notice_n that_o whereas_o the_o membrane_n be_v very_o thin_a part_n and_o therefore_o seem_v unfit_a to_o make_v any_o great_a resistance_n we_o have_v try_v that_o if_o a_o piece_n of_o fine_a bladder_n be_v fasten_v to_o the_o orifice_n of_o a_o brass-pipe_n of_o about_o a_o inch_n in_o diameter_n we_o can_v not_o by_o draw_v the_o air_n from_o beneath_o it_o make_v the_o weight_n of_o the_o atmosphere_n break_v the_o bladder_n though_o the_o weight_n be_v perhaps_o equivalent_a to_o a_o erect_v cylinder_n of_o water_n of_o the_o wideness_n of_o the_o orifice_n and_o about_o 30._o foot_n high_a and_o weâ—e_v indeed_o such_o 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be_v make_v exact_o congruous_a to_o the_o bottom_n of_o the_o vessel_n and_o consequent_o the_o water_n may_v get_v in_o between_o they_o for_o which_o cause_n it_o be_v necessary_a to_o keep_v the_o wooden_a plate_n forcible_o down_o with_o a_o stick_n which_o else_o be_v needless_a and_o consequent_o this_o interpose_a water_n will_v communicate_v with_o the_o lateral_o superior_a water_n in_o the_o vessel_n which_o superior_a water_n may_v according_a to_o the_o law_n hydrostatical_a by_o the_o intervention_n of_o the_o interpose_a exercise_v its_o pressure_n upward_o against_o the_o low_a surface_n of_o the_o wooden_a plate_n three_o the_o doctor_n scheme_n allow_v and_o assist_v we_o to_o conceive_v which_o we_o may_v do_v however_o a_o imaginary_a plane_n of_o water_n to_o be_v parallel_n to_o the_o bottom_n of_o the_o vessel_n and_o to_o pass_v along_o the_o bottom_n of_o the_o board_n so_o that_o of_o the_o water_n that_o lie_v between_o this_o plane_n and_o the_o bottom_n 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mention_v difference_n of_o pressure_n and_o it_o be_v with_o a_o express_a or_o suppose_a exception_n of_o such_o a_o difference_n which_o in_o many_o other_o case_n may_v be_v safe_o neglect_v that_o which_o i_o desire_v you_o to_o take_v notice_n of_o in_o most_o place_n of_o this_o discourse_n i_o speak_v of_o the_o pressure_n of_o ambient_fw-la fluid_v on_o immerse_v solid_n as_o uniform_a or_o every_o way_n equal_a it_o be_v true_a that_o according_a to_o the_o doctor_n supputation_n if_o the_o solid_a cylinder_n consist_v of_o the_o wooden_a plate_n and_o all_o the_o water_n direct_o incumbent_a on_o it_o be_v put_v into_o a_o ordinary_a balance_n it_o will_v there_o many_o time_n outweigh_v the_o hollow_a cylinder_n of_o water_n alone_o that_o lean_v upon_o the_o uncover_a part_n of_o the_o imaginary_a plane_n and_o that_o be_v it_o that_o seem_v to_o have_v deceive_v the_o learned_a doctor_n but_o there_o be_v divers_a hydrostatical_a case_n wherein_o the_o phaenomenon_n 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the_o pipe_n yet_o if_o this_o last_o name_v water_n be_v for_o instance_n two_o foot_n high_a and_o that_o in_o the_o vessel_n but_o one_o the_o water_n in_o the_o pipe_n will_v ready_o subside_o till_o it_o come_v almost_o to_o a_o level_n with_o the_o external_a water_n though_o it_o can_v do_v so_o without_o raise_v the_o whole_a mass_n of_o water_n that_o stagnate_v in_o the_o vessel_n and_o now_o i_o shall_v subjoin_v a_o experiment_n which_o though_o at_o first_o it_o may_v seem_v slight_a and_o be_v make_v in_o lesser_a glass_n &_o quantity_n than_o i_o will_v have_v employ_v if_o i_o can_v have_v procure_v better_a accommodation_n have_v the_o advantage_n of_o require_v no_o curious_a instrument_n and_o yet_o i_o hope_v will_v serve_v for_o a_o ocular_a proof_n of_o the_o fallaciousness_n of_o that_o reason_v the_o doctor_n be_v so_o strange_o confident_a of_o we_o take_v a_o open_a mouth_a glass_n such_o as_o some_o call_v jar_n and_o lady_n often_o use_v to_o keep_v sweet_a meat_n in_o which_o be_v three_o inch_n and_o a_o half_a or_o better_a in_o diameter_n and_o somewhat_o less_o in_o depth_n and_o have_v the_o figure_n of_o its_o cavity_n cylindrical_a enough_o into_o this_o have_v put_v some_o water_n to_o cover_v the_o protuberance_n wont_a to_o be_v at_o the_o bottom_n of_o such_o glass_n we_o take_v a_o convenient_a quantity_n of_o bees-wax_n and_o have_v just_o melt_v it_o we_o pour_v it_o cautious_o into_o the_o glass_n warm_v beforehand_o to_o prevent_v its_o crack_n till_o it_o reach_v to_o a_o convenient_a height_n this_o vessel_n and_o the_o contain_v liquor_n we_o set_v aside_o to_o cool_v in_o expectation_n that_o when_o the_o heat_n that_o have_v dilate_v the_o wax_n be_v go_v it_o will_v shrink_v from_o the_o glass_n and_o consequent_o leave_v a_o little_a interval_n every_o where_n between_o the_o concave_a superficies_n of_o the_o vessel_n and_o convex_v of_o the_o harden_v wax_n which_z according_o come_v to_o pass_v and_o save_v i_o 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appenso_fw-la pondere_fw-la sustentatur_fw-la what_o considerable_a interest_n the_o suppose_a but_o unprove_v retraction_n of_o the_o valve_n or_o the_o air_n itself_o can_v have_v in_o this_o phaenomenon_n i_o confess_v i_o do_v not_o discern_v not_o be_v able_a to_o see_v but_o that_o the_o experiment_n will_v succeed_v when_o try_v in_o vacuo_fw-la although_o all_o the_o atmosphetical_a air_n be_v annihilate_v but_o if_o i_o mistake_v the_o doctor_n meaning_n i_o be_o to_o be_v excuse_v since_o i_o do_v it_o not_o willing_o and_o his_o own_o obscurity_n have_v be_v accessary_a to_o it_o nor_o be_o i_o very_o apprehensive_a of_o be_v unable_a to_o defend_v my_o account_n of_o a_o experiment_n which_o as_o you_o know_v have_v have_v the_o good_a fortune_n to_o recommend_v the_o doctrine_n for_o the_o proof_n whereof_o i_o devise_v it_o to_o many_o learned_a and_o curious_a person_n several_a of_o which_o be_v sufficient_o indispose_v to_o admit_v it_o and_o to_o avoid_v all_o 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ambient_fw-la fluid_fw-la than_o the_o positive_a levity_n of_o a_o body_n light_a in_o specie_fw-la than_o it_o that_o make_v the_o immersed_a body_n ascend_v to_o the_o surface_n of_o the_o liquor_n i_o devise_v this_o experiment_n we_o take_v a_o bladder_n out_o of_o which_o a_o great_a part_n of_o the_o include_v air_n have_v be_v express_v and_o tie_v the_o neck_n of_o it_o very_o close_a that_o none_o of_o the_o remain_a air_n may_v get_v out_o we_o fasten_v to_o it_o a_o considerable_a weight_n of_o some_o very_a ponderous_a body_n as_o lead_v or_o iron_n by_o the_o help_n of_o this_o we_o sink_v the_o bladder_n to_o the_o bottom_n of_o a_o wide_a mouth_a glass_n full_a of_o water_n that_o the_o surface_n of_o the_o liquor_n may_v be_v a_o good_a deal_n high_o than_o the_o upper_a part_n of_o the_o bladder_n this_o wide_a mouth_a glass_n we_o include_v in_o a_o great_a receiver_n who_o orifice_n must_v be_v very_o large_a to_o be_v able_a to_o admit_v such_o a_o vessel_n which_o i_o cause_v to_o be_v careful_o cement_v on_o to_o the_o engine_n the_o main_a scope_n of_o this_o experiment_n be_v to_o show_v that_o though_o the_o air_n include_v in_o the_o bladder_n be_v very_o far_o from_o be_v able_a by_o its_o absolute_a levity_n to_o lift_v up_o so_o great_a a_o weight_n as_o the_o bladder_n be_v clog_v with_o yet_o the_o same_o air_n continual_o include_v in_o the_o bladder_n will_v by_o its_o mere_a expansion_n without_o any_o new_a external_a heat_n acquire_v a_o power_n of_o ascend_v in_o spite_n of_o that_o weight_n which_o ascension_n therefore_o must_v be_v attribute_v to_o the_o water_n which_o according_a to_o the_o law_n hydrostatical_a ought_v caeterisparibus_fw-la to_o resist_v or_o buoy_v up_o more_o potent_o those_o immersed_a body_n that_o be_v light_a in_o specie_fw-la than_o it_o possess_v the_o great_a place_n in_o it_o and_o hinder_v the_o more_o water_n from_o acquire_v its_o due_a situation_n as_o we_o see_v that_o among_o hollow_a sphere_n of_o glass_n and_o metal_n equal_o thick_a and_o well_o stop_v there_o be_v a_o much_o heavy_a weight_n requisite_a to_o sink_v a_o large_a one_o than_o a_o small_a one_o for_o the_o prosecution_n of_o this_o trial_n we_o begin_v to_o pump_v the_o air_n out_o of_o the_o great_a receiver_n and_o its_o pressure_n upon_o the_o surface_n of_o the_o water_n be_v thereby_o more_o and_o more_o lessen_v according_a to_o what_o we_o elsewhere_o more_o full_o declare_v the_o spring_n of_o the_o include_v air_n begin_v by_o degree_n to_o distend_a the_o side_n of_o the_o bladder_n till_o at_o length_n that_o vessel_n of_o air_n swell_v every_o way_n take_v up_o so_o much_o more_o room_n in_o the_o water_n than_o it_o do_v before_o that_o the_o water_n be_v able_a to_o lift_v the_o bladder_n and_o the_o annex_v weight_n to_o the_o top_n and_o detain_v it_o there_o till_o we_o think_v fit_a to_o let_v in_o again_o some_o of_o the_o exclude_v air_n which_o force_v that_o in_o the_o bladder_n to_o shrink_v in_o its_o dimension_n the_o weight_n be_v present_o able_a to_o sink_v it_o to_o the_o bottom_n and_o here_o it_o may_v be_v note_v that_o if_o instead_o of_o hang_v so_o great_a a_o weight_n at_o the_o neck_n of_o the_o bladder_n we_o fasten_v but_o a_o moderate_o heavy_a piece_n of_o lead_n such_o as_o will_v only_o serve_v to_o sink_v the_o bladder_n and_o keep_v it_o at_o the_o bottom_n of_o the_o water_n so_o that_o the_o aggregate_v of_o the_o bladder_n air_n and_o metal_n be_v but_o a_o little_o heavy_a than_o a_o bulk_n of_o water_n equal_a to_o they_o then_o upon_o the_o first_o suck_v or_o operation_n of_o the_o pump_n which_o can_v withdraw_v but_o a_o small_a part_n of_o the_o air_n in_o the_o receiver_n the_o air_n in_o the_o bladder_n sudden_o expand_v itself_o will_v forthwith_o be_v impetuous_o extrude_v by_o the_o water_n though_o after_o some_o reciprocation_n it_o will_v float_v in_o its_o due_a position_n till_o upon_o the_o return_n of_o a_o little_a outward_a air_n sometime_o as_o little_a as_o we_o can_v convenient_o let_v in_o it_o will_v immediate_o subside_o but_o this_o be_v not_o so_o necessary_a to_o be_v insist_v on_o as_o it_o be_v to_o take_v notice_n that_o i_o foresee_v it_o may_v be_v object_v that_o the_o ascension_n of_o the_o weight_n be_v not_o effect_v by_o the_o pressure_n of_o the_o water_n but_o by_o this_o that_o rarity_n and_o levity_n be_v quality_n exceed_o of_o kin_n the_o great_a rarefaction_n of_o the_o air_n may_v proportionable_o increase_v the_o levity_n of_o it_o and_o consequent_o enable_v it_o to_o perform_v much_o great_a thing_n than_o it_o can_v do_v before_o i_o will_v not_o here_o dispute_v whether_o general_o speak_v a_o body_n rarify_v without_o heat_n will_v in_o vacuo_fw-la or_o in_o a_o fluid_n not_o heavy_a in_o specie_fw-la than_o the_o body_n when_o rarefy_v mere_o by_o such_o a_o great_a distance_n of_o its_o part_n as_o may_v suffice_v to_o entitle_v it_o to_o rarefaction_n become_v real_o heavy_a or_o light_a than_o before_o i_o will_v not_o i_o say_v discuss_v this_o question_n here_o where_o it_o may_v serve_v my_o turn_n to_o satisfy_v the_o recite_v objection_n by_o the_o follow_a experiment_n exper._n iii_o about_o the_o neck_n of_o a_o convenient_o shape_a viol_n capable_a to_o hold_v some_o few_o ounce_n of_o water_n i_o cause_v to_o be_v careful_o tie_v the_o neck_n of_o a_o small_a bladder_n whence_o the_o air_n have_v be_v diligent_o express_v so_o that_o the_o bladder_n be_v very_o limber_a of_o itself_o and_o probable_o make_v more_o so_o as_o well_o as_o more_o impervious_a to_o air_n and_o water_n by_o the_o fine_a oil_n we_o have_v cause_v it_o to_o be_v rub_v with_o lay_v upon_o the_o orifice_n
of_o the_o viol_n like_o a_o skin_n clap_v together_o with_o many_o fold_n and_o wrinkle_n this_o do_v we_o let_v down_o the_o viol_n into_o a_o convenient_o shape_a vessel_n full_a of_o water_n and_o the_o viol_n be_v poise_v beforehand_o for_o that_o purpose_n sink_v perpendicular_o in_o the_o liquor_n till_o the_o neck_n of_o the_o glass_n be_v partly_o above_o and_o partly_o beneath_o the_o surface_n of_o the_o water_n then_o cover_v the_o external_a glass_n with_o a_o large_a receiver_n we_o cause_v the_o air_n to_o be_v pump_v out_o and_o as_o the_o pressure_n of_o that_o be_v gradual_o withdraw_v the_o air_n in_o the_o float_a viol_n do_v little_a by_o little_a expand_v itself_o into_o the_o bladder_n and_o unfold_v the_o winkle_n of_o it_o till_o at_o length_n it_o become_v full_o blow_v without_o alter_v the_o erect_a posture_n of_o the_o glass_n it_o lean_v upon_o but_o this_o great_a expansion_n be_v make_v above_o the_o water_n and_o consequent_o in_o a_o medium_n not_o heavy_a than_o the_o include_v air_n give_v that_o high_o rarefy_v air_n no_o such_o increase_n of_o levity_n as_o enable_v we_o to_o perceive_v that_o it_o make_v so_o much_o as_o the_o neck_n of_o the_o glass_n arise_v high_o in_o the_o water_n than_o it_o do_v before_o nor_o do_v we_o take_v notice_n that_o the_o return_n of_o the_o air_n into_o the_o receiver_n by_o reduce_v the_o air_n in_o the_o bladder_n to_o its_o former_a unrarify_v estate_n make_v the_o glass_n sink_v deep_a than_o before_o but_o when_o the_o experiment_n be_v try_v with_o the_o same_o glass_n and_o bladder_n at_o the_o bottom_n of_o the_o water_n then_o upon_o the_o pump_v out_o the_o air_n the_o bladder_n be_v dilate_v under_o water_n be_v after_o a_o while_n carry_v up_o to_o the_o top_n and_o take_v up_o with_o it_o about_o eight_o or_o ten_o ounce_n that_o have_v be_v to_o clog_v it_o fasten_v to_o the_o bottom_n of_o the_o viol._n new_a experiment_n about_o the_o pressure_n of_o the_o air_n be_v spring_n on_o body_n under_o water_n new_a experiment_n about_o the_o pressure_n of_o the_o air_n be_v spring_n on_o body_n under_o water_n i_o do_v not_o think_v it_o be_v difficult_a for_o a_o intelligent_a peruser_n of_o our_o physicomechanical_a experiment_n to_o find_v there_o divers_a phaenomena_n whence_o it_o may_v be_v deduce_v that_o body_n under_o water_n though_o keep_v by_o that_o liquor_n from_o the_o immediate_a contact_n of_o the_o air_n may_v yet_o be_v expose_v to_o its_o pressure_n whether_o the_o air_n act_n as_o have_v a_o weight_n or_o as_o a_o spring_n but_o because_o not_o only_o the_o vulgar_a but_o philosopher_n have_v be_v so_o long_o and_o general_o possess_v with_o a_o opinion_n that_o a_o fluid_a so_o little_a heavy_a as_o the_o air_n can_v by_o its_o weight_n act_n upon_o a_o liquor_n that_o be_v like_o water_n bulk_n for_o bulk_n a_o thousand_o time_n heavy_a than_o it_o and_o because_o also_o it_o seem_v yet_o more_o strange_a that_o a_o little_a air_n perhaps_o not_o amount_v to_o a_o scruple_n or_o drachm_n in_o weight_n shall_v in_o its_o ordinary_a state_n of_o laxity_n act_v considerable_o upon_o body_n which_o be_v cover_v with_o water_n seem_v by_o the_o interposition_n of_o that_o liquor_n to_o be_v fence_v from_o the_o incumbent_a air_n it_o may_v be_v worth_a while_n to_o add_v three_o or_o four_o hydrostatical_a experiment_n to_o confirm_v a_o truth_n that_o very_o few_o be_v yet_o acquaint_v with_o and_o add_v to_o the_o proof_n already_o give_v of_o the_o power_n of_o the_o spring_n of_o the_o air_n some_o of_o the_o operation_n we_o have_v discover_v it_o to_o have_v upon_o body_n place_v under_o water_n there_o be_v two_o sort_n of_o trial_n that_o i_o shall_v employ_v to_o show_v that_o a_o small_a quantity_n of_o enclose_a air_n may_v by_o its_o pressure_n which_o in_o our_o case_n must_v depend_v upon_o its_o spring_n have_v a_o considerable_a operation_n upon_o body_n under_o water_n notwithstanding_o the_o interposition_n of_o that_o liquor_n for_o this_o pressure_n we_o speak_v of_o may_v be_v manifest_v in_o the_o first_o place_n by_o what_o it_o direct_o and_o positive_o operate_v upon_o body_n cover_v with_o water_n and_o in_o the_o next_o place_n by_o the_o thing_n that_o regular_o ensue_v upon_o the_o removal_n of_o the_o enclose_v air_n or_o the_o weaken_n of_o its_o spring_n exper._n i._n to_o begin_v with_o the_o former_a way_n of_o show_v the_o pressure_n of_o the_o air_n i_o think_v it_o sufficient_a in_o regard_n of_o the_o trial_n to_o be_v refer_v to_o the_o second_o way_n to_o make_v the_o follow_a experiment_n we_o take_v a_o square_a glass-viol_n guess_v to_o be_v capable_a of_o hold_v between_o half_a a_o pint_n and_o a_o pint_n of_o water_n the_o neck_n of_o this_o we_o lute_v on_o careful_o and_o strong_o for_o else_o it_o will_v have_v be_v buoy_v up_o over_o the_o orifice_n of_o the_o small_a pipe_n at_o which_o the_o air_n pass_v in_o our_o engine_n out_o of_o the_o receiver_n into_o the_o pump_n then_o whelm_v over_o this_o glass_n a_o great_a receiver_n we_o lute_v it_o strong_o to_o the_o engine_n that_o it_o may_v as_o well_o keep_v in_o the_o water_n as_o keep_v out_o the_o air_n and_o at_o the_o top_n pour_v in_o as_o much_o water_n as_o suffice_v to_o environ_v the_o internal_a receiver_n if_o i_o may_v so_o call_v it_o and_o cover_v it_o to_o a_o pretty_a height_n this_o do_v we_o exact_o close_v with_o a_o turn_a key_n the_o holâ—_n in_o the_o great_a receiver_n at_o which_o the_o water_n have_v be_v pour_v in_o that_o no_o air_n may_v get_v in_o or_o out_o that_o way_n and_o last_o we_o begin_v to_o pump_v out_o the_o air_n contain_v in_o the_o internal_a receiver_n to_o the_o end_n that_o that_o air_n which_o by_o the_o abovementioned_a pipe_n have_v communication_n with_o the_o external_n air_n may_v no_o long_o by_o its_o pressure_n assist_v the_o glass_n to_o resist_v the_o pressure_n which_o the_o incumbent_n and_o enclose_v air_n by_o virtue_n of_o its_o spring_n constant_o exercise_n upon_o the_o subjacent_a water_n and_o by_o its_o intervention_n upon_o the_o side_n and_o bottom_n of_o the_o internal_a receiver_n and_o as_o we_o expect_v not_o that_o this_o glass_n by_o its_o own_o single_a force_n shall_v resist_v the_o pressure_n of_o the_o air_n enclose_v in_o the_o upper_a part_n of_o the_o great_a receiver_n notwithstanding_o the_o interposition_n of_o the_o water_n so_o the_o event_n full_o justify_v our_o conjecture_n for_o at_o the_o first_o exuction_n which_o can_v not_o be_v suppose_v to_o have_v well_o empty_v the_o internal_a glass_n this_o vessel_n be_v by_o the_o pressure_n of_o the_o superior_a air_n upon_o the_o circumstant_fw-la water_n break_v into_o i_o know_v not_o how_o many_o piece_n and_o the_o same_o experiment_n though_o with_o a_o little_o slow_a success_n be_v repeat_v with_o a_o strong_a internal_a glass_n exper._n ii_o i_o proceed_v now_o to_o the_o second_o way_n of_o manifest_v the_o pressure_n of_o enclose_v air_n upon_o body_n under_o water_n which_o be_v by_o show_v the_o phaenomena_n exhibit_v by_o those_o body_n upon_o the_o removal_n or_o lessen_v of_o that_o pressure_n have_v squeeze_v out_o of_o a_o moderate_o size_a bladder_n the_o great_a part_n of_o its_o air_n we_o tie_v the_o neck_n of_o it_o very_o close_a and_o then_o fasten_v to_o it_o a_o competent_a weight_n we_o place_v it_o at_o the_o bottom_n of_o the_o tall_a and_o large_a glass_n we_o can_v cover_v with_o our_o great_a receiver_n that_o so_o though_o the_o incumbent_a air_n be_v pump_v out_o none_o of_o the_o water_n may_v be_v pump_v out_o with_o it_o but_o still_o retain_v the_o same_o height_n above_o the_o bladder_n have_v then_o pour_v upon_o the_o bladder_n as_o much_o water_n as_o will_v swim_v a_o great_a way_n above_o the_o upper_a part_n of_o it_o we_o cover_v this_o glass_n of_o water_n with_o a_o great_a receiver_n which_o be_v careful_o cement_v on_o to_o the_o engine_n the_o pump_n be_v set_v a-work_o and_o as_o the_o air_n which_o by_o its_o spring_n press_v upon_o the_o surface_n of_o the_o include_v water_n be_v by_o degree_n pump_v out_o so_o the_o air_n that_o be_v imprison_v in_o the_o bladder_n do_v gradual_o expand_v itself_o at_o the_o bottom_n of_o the_o water_n as_o if_o no_o such_o liquor_n have_v interpose_v between_o they_o otherwise_o than_o by_o its_o weight_n upon_o who_o account_n it_o must_v be_v allow_v to_o give_v some_o little_a impediment_n to_o the_o expansion_n of_o the_o bladder_n in_o proportion_n to_o the_o height_n it_o have_v above_o it_o the_o event_n of_o our_o experiment_n be_v such_o as_o be_v expect_v namely_o that_o the_o immersed_a bladder_n be_v at_o length_n full_o blow_v by_o the_o
dilatation_n of_o the_o air_n enclose_v in_o it_o and_o by_o its_o intumescence_n make_v a_o considerable_a part_n of_o the_o water_n run_v over_o by_o the_o side_n of_o the_o glass_n that_o before_o contain_v it_o all_o and_o when_o access_n be_v give_v again_o to_o the_o external_a air_n the_o internal_a be_v compress_v the_o bladder_n be_v present_o reduce_v to_o its_o wrinkle_a state_n exper._n iii_o we_o take_v a_o small_a but_o fine_a bladder_n who_o neck_n be_v strong_o tie_v up_o when_o it_o be_v by_o guess_n about_o half_a full_a of_o air_n this_o we_o put_v into_o a_o short_a brass_n cylinder_n the_o low_a of_o who_o base_n be_v close_v with_o a_o brass-plate_n and_o the_o other_o leave_v open_a this_o open_a orifice_n we_o afterward_o stop_v but_o not_o exact_o with_o a_o cylindrical_a plugg_n that_o be_v somewhat_o less_o wide_a than_o it_o and_o be_v by_o a_o rim_n at_o the_o top_n hinder_v from_o reach_v too_o deep_a into_o the_o cavity_n of_o the_o cylinder_n that_o it_o may_v not_o do_v mischief_n to_o the_o bladder_n that_o lie_v there_o beneath_o it_o upon_o this_o plugg_n we_o place_v a_o almost_o conical_o shape_v weight_n of_o lead_n and_o this_o pile_n of_o several_a thing_n be_v so_o place_v upon_o our_o engine_n that_o we_o can_v cover_v it_o with_o a_o great_a receiver_n we_o careful_o cement_v on_o this_o vessel_n and_o at_o the_o top_n of_o it_o pour_v in_o so_o much_o water_n as_o will_v serve_v to_o fill_v the_o vacant_a part_n of_o the_o brass_n cylinder_n and_o the_o cavity_n of_o the_o engine_n to_o such_o a_o height_n that_o it_o cover_v all_o the_o leaden_a weight_n which_o be_v several_a inch_n high_a except_o a_o rim_n which_o be_v fasten_v to_o the_o top_n of_o it_o for_o the_o convenienter_fw-la remove_v of_o it_o all_o this_o be_v do_v the_o pump_n be_v set_v a-work_o and_o long_o before_o we_o have_v exhaust_v the_o air_n of_o the_o receiver_n that_o which_o be_v enclose_v in_o the_o lank_a bladder_n have_v by_o degree_n display_v so_o vigorous_a a_o spring_n that_o it_o have_v heave_v up_o the_o weight_n that_o lie_v upon_o it_o to_o a_o notable_a height_n and_o keep_v it_o there_o till_o the_o air_n be_v let_v in_o from_o without_o to_o assist_v its_o be_v depress_v by_o the_o leaden_a weight_n which_o amount_v to_o no_o less_o than_o about_o 28._o pound_n exper._n iu._n there_o remain_v yet_o one_o trial_n to_o be_v make_v which_o in_o case_n it_o shall_v succeed_v seem_v likely_a to_o appear_v as_o great_a a_o evidence_n of_o the_o force_n of_o the_o air_n be_v spring_n upon_o body_n under_o water_n as_o can_v be_v reasonable_o desire_v of_o we_o it_o have_v be_v look_v upon_o by_o many_o virtuoso_n as_o the_o considerabl_a instance_n of_o the_o force_n of_o the_o air_n be_v spring_n even_o when_o no_o water_n intervene_v in_o the_o trial_n to_o satisfy_v therefore_o our_o curiosity_n we_o take_v a_o copper_n vessel_n of_o a_o cylindrical_a shape_n and_o a_o considerable_a height_n into_o this_o be_v first_o almost_o fill_v with_o water_n we_o put_v a_o square_a glass-vial_n capable_a by_o guess_n to_o hold_v nine_o or_o ten_o ounce_n of_o water_n and_o exact_o stop_v with_o a_o cork_n and_o a_o close_a cement_n this_o vial_n by_o a_o competent_a weight_n be_v detain_v at_o the_o bottom_n of_o the_o water_n from_o who_o upper_a surface_n it_o be_v considerable_o distant_a then_o the_o copper_n vessel_n be_v place_v upon_o the_o engine_n and_o include_v in_o a_o great_a receiver_n well_o cement_v on_o the_o air_n be_v by_o degree_n pump_v out_o but_o before_o it_o be_v quite_o exhaust_v the_o glass_n at_o the_o bottom_n of_o the_o water_n be_v by_o the_o spring_n of_o the_o air_n include_v in_o it_o burst_v into_o many_o piece_n not_o without_o great_a noise_n and_o a_o kind_n of_o smoke_n or_o mist_n that_o appear_v above_o the_o surface_n of_o the_o water_n another_o glass_n of_o the_o same_o sort_n have_v be_v break_v after_o the_o same_o manner_n in_o another_o vessel_n 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