body_n or_o of_o some_o intervening_a body_n which_o by_o its_o cohesion_n with_o it_o aught_o in_o our_o present_a case_n to_o be_v consider_v as_o part_v of_o it_o and_o thus_o attraction_n seem_v to_o be_v but_o a_o species_n of_o pulsion_n and_o usual_o belong_v to_o that_o kind_a of_o it_o which_o for_o distinction_n sake_n be_v call_v trusion_n by_o which_o we_o understand_v that_o kind_n of_o pulsion_n wherein_o the_o movent_fw-la go_v along_o with_o the_o move_a body_n without_o quit_v it_o whilst_o the_o progress_n last_v as_o it_o happen_v when_o a_o gardener_n drive_v his_o wheel-barrow_n before_o he_o without_o let_v go_v his_o hold_n of_o it_o but_o i_o must_v not_o here_o dissemble_v a_o difficulty_n that_o i_o foresee_v may_v be_v specious_o urge_v against_o this_o account_n of_o attraction_n for_o it_o may_v be_v say_v that_o there_o be_v attraction_n where_o it_o can_v be_v pretend_v that_o any_o part_n of_o the_o attrahent_fw-la come_v behind_o the_o attract_v body_n as_o in_o magnetical_a and_o electrical_a attraction_n and_o in_o that_o which_o be_v make_v of_o water_n when_o it_o be_v draw_v up_o into_o spring_n and_o pump_n i_o need_v not_o tell_v you_o that_o you_o know_v so_o well_o as_o that_o partly_o the_o cartesian_o and_o partly_o other_o modern_a philosopher_n have_v recourse_n on_o this_o occasion_n either_o to_o screw_v particle_n and_o other_o magnetical_a emission_n to_o explicate_v phaenomena_n of_o this_o kind_n and_o according_a to_o such_o hypothesis_n one_o may_v say_v that_o many_o of_o these_o magnetical_a and_o electrical_a effluvia_fw-la come_v behind_o some_o part_n of_o the_o attract_a body_n or_o at_o least_o of_o the_o little_a solid_a particle_n that_o be_v as_o it_o be_v the_o wall_n of_o their_o pore_n or_o procure_v some_o discussion_n of_o the_o air_n that_o may_v make_v it_o thrust_v the_o movable_a towards_o the_o loadstone_n or_o amber_n etc._n etc._n but_o if_o there_o be_v none_o of_o these_o nor_o any_o other_o subtle_a agent_n that_o cause_v this_o motion_n by_o a_o real_a though_o unperceived_a pulsion_n i_o shall_v make_v a_o distinction_n betwixt_o other_o attraction_n and_o these_o which_o i_o shall_v then_o style_v attraction_n by_o invisibles_n but_o whether_o there_o be_v real_o any_o such_o in_o nature_n and_o why_o i_o scruple_n to_o admit_v thing_n so_o hard_o to_o be_v conceive_v may_v be_v elsewhere_o consider_v and_o you_o will_v i_o presume_v the_o free_o allow_v i_o this_o liberty_n if_o since_o in_o this_o place_n it_o be_v proper_a to_o do_v it_o i_o show_v you_o that_o in_o the_o last_o of_o the_o instance_n i_o former_o object_v that_o of_o the_o draw_v up_o of_o water_n into_o the_o barrel_n of_o a_o syringe_n there_o be_v no_o true_a attraction_n of_o the_o liquor_n make_v by_o the_o external_a air._n i_o say_v then_o that_o by_o the_o ascend_a rammer_n as_o a_o part_n of_o which_o i_o here_o consider_v the_o obtuse_a end_n plug_n or_o sucker_n there_o be_v no_o attraction_n make_v of_o the_o contiguous_a and_o subjacent_a water_n but_o only_o there_o be_v room_n make_v for_o it_o to_o rise_v into_o without_o be_v expose_v to_o the_o pressure_n of_o the_o supeiour_n air._n for_o if_o we_o suppose_v the_o whole_a rammer_n to_o be_v by_o divine_a omnipotence_n annihilate_v and_o consequent_o uncapable_a of_o exercise_v any_o attraction_n yet_o provide_v the_o superior_a air_n be_v keep_v off_o from_o the_o water_n by_o any_o other_o way_n as_o well_o as_o it_o be_v by_o the_o rammer_n the_o liquor_n will_v as_o well_o ascend_v into_o the_o cavity_n of_o the_o barrel_n since_o as_o i_o have_v elsewhere_o abundant_o prove_v the_o surface_n of_o the_o terraqueous_a globe_n be_v continual_o press_v on_o by_o the_o incumbent_a air_n or_o atmosphere_n the_o water_n must_v be_v by_o that_o pressure_n impel_v into_o any_o cavity_n here_o below_o where_o there_o be_v no_o air_n to_o resist_v it_o as_o by_o our_o supposition_n there_o be_v not_o in_o the_o barrel_n of_o our_o syringe_n when_o the_o rammer_n or_o whatever_o else_o be_v in_o it_o have_v be_v annihilate_v which_o reason_v may_v be_v sufficient_o confirm_v by_o a_o experiment_n whereby_o i_o have_v more_o than_o once_o show_v some_o curious_a person_n that_o if_o the_o external_a air_n and_o consequent_o its_o pressure_n be_v withdraw_v from_o about_o the_o syringe_n one_o may_v pull_v up_o the_o sucker_n as_o much_o as_o he_o please_v without_o draw_v up_o after_o it_o the_o subjacent_a water_n in_o short_a let_v we_o suppose_v that_o a_o man_n stand_v in_o a_o inner_a room_n do_v by_o his_o utmost_a resistance_n keep_v shut_v a_o door_n that_o be_v neither_o lock_v nor_o latch_a against_o another_o who_o with_o equal_a force_n endeavour_n to_o thrust_v it_o open_a in_o this_o case_n as_o if_o one_o shall_v forcible_o pull_v away_o the_o first_o man_n it_o can_v not_o be_v say_v that_o this_o man_n by_o his_o recess_n from_o the_o door_n he_o endeavour_v to_o press_v outward_o do_v true_o and_o proper_o draw_v in_o his_o antagonist_n though_o upon_o that_o recess_n the_o come_n in_o of_o his_o antagonist_n will_v present_o ensue_v so_o it_o can_v proper_o be_v say_v that_o by_o the_o ascent_n of_o the_o rammer_n which_o displace_v the_o superior_a air_n either_o the_o rammer_n itself_o or_o the_o expel_v air_n do_v proper_o attract_v the_o subjacent_a water_n though_o the_o ingress_n of_o that_o liquor_n into_o the_o barrel_n do_v thereupon_o necessary_o ensue_v and_o that_o as_o the_o comparison_n suppose_v there_o be_v a_o pressure_n of_o the_o superior_a air_n against_o the_o upper_a part_n of_o the_o sucker_n you_o may_v easy_o perceive_v if_o have_v well_o stop_v the_o low_a orifice_n of_o the_o syringe_n with_o your_o finger_n you_o forcible_o draw_v up_o the_o sucker_n to_o the_o top_n of_o the_o barrel_n for_o if_o then_o you_o let_v go_v the_o rammer_n you_o will_v find_v it_o impel_v downward_o by_o the_o incumbent_a air_n with_o a_o notable_a force_n chap._n ii_o have_v thus_o premise_v something_o in_o general_n about_o the_o nature_n of_o attraction_n as_o far_o as_o it_o be_v necessary_a for_o my_o present_a design_n it_o will_v be_v now_o seasonable_a to_o proceed_v to_o the_o consideration_n of_o that_o kind_n of_o attraction_n that_o be_v employ_v to_o raise_v liquor_n and_o be_v by_o a_o distinct_a name_n call_v suction_n about_o the_o cause_n of_o this_o there_o be_v great_a contention_n between_o the_o new_a philosopher_n as_o they_o be_v style_v and_o the_o peripatetic_n for_o the_o follower_n of_o aristotle_n and_o many_o learned_a man_n that_o in_o other_o thing_n dissent_v from_o he_o ascribe_v the_o ascension_n of_o liquor_n upon_o suction_n to_o nature_n abhorrence_n of_o a_o vacuum_n for_o say_v they_o when_o a_o man_n dip_v one_o end_n of_o a_o straw_n or_o reed_n into_o stagnant_a water_n and_o suck_v at_o the_o other_o end_n the_o air_n contain_v in_o the_o cavity_n of_o the_o reed_n pass_v into_o that_o of_o his_o lung_n and_o consequent_o the_o reed_n will_v be_v leave_v empty_a if_o no_o other_o body_n succeed_v in_o the_o place_n it_o desert_n but_o there_o be_v only_o that_o they_o take_v notice_n of_o two_o body_n that_o can_v succeed_v the_o air_n and_o the_o grosser_n liquor_n the_o water_n and_o the_o air_n can_v do_v it_o because_o of_o the_o interposition_n of_o the_o water_n that_o deny_v it_o access_n to_o the_o immersed_a orifice_n of_o the_o reed_n and_o therefore_o it_o must_v be_v the_o water_n itself_o which_o according_o do_v ascend_v to_o prevent_v a_o vacuum_n detest_a by_o nature_n but_o many_o of_o the_o modern_a philosopher_n and_o general_o all_o the_o corpuscularian_o look_v upon_o this_o fuga_fw-la vacui_fw-la as_o but_o a_o imaginary_a cause_n of_o suction_n though_o they_o do_v it_o upon_o very_o differ_v ground_n for_o the_o atomist_n that_o willing_o admit_v of_o vacuity_n proper_o so_o call_v both_o within_o and_o without_o our_o world_n can_v think_v that_o nature_n hate_v or_o fear_v a_o vacuum_n and_o decline_v her_o usual_a course_n to_o prevent_v it_o and_o the_o cartesian_o though_o they_o do_v as_o well_o as_o the_o peripatetic_n deny_v that_o there_o be_v a_o vacuum_n yet_o since_o they_o affirm_v not_o only_o that_o there_o be_v none_o in_o rerum_fw-la natura_fw-la but_o that_o there_o can_v be_v none_o because_o what_o other_o call_v a_o empty_a space_n have_v three_o dimension_n have_v all_o that_o they_o think_v belong_v to_o the_o essence_n of_o a_o body_n they_o will_v not_o grant_v nature_n to_o be_v so_o indiscreet_a as_o to_o strain_v herself_o to_o prevent_v the_o make_n of_o a_o thing_n that_o be_v impossible_a to_o be_v make_v the_o peripatetic_a opinion_n about_o the_o cause_n of_o suction_n though_o common_o defend_v by_o the_o school_n as_o well_o modern_a as_o ancient_n
the_o air_n which_o by_o its_o spring_n will_v hinder_v the_o ascension_n of_o the_o mercury_n as_o be_v easy_a to_o be_v try_v the_o instrument_n have_v be_v thus_o fit_v i_o cause_v one_o of_o the_o bystander_n to_o suck_v at_o the_o short_a leg_n whereupon_o as_o i_o expect_v there_o present_o ensue_v a_o ascension_n of_o four_o or_o five_o inch_n of_o mercury_n in_o that_o leg_n and_o a_o proportionable_a subsidence_n of_o the_o mercury_n in_o the_o long_o and_o yet_o in_o this_o case_n the_o raise_n of_o the_o mercury_n can_v be_v pretend_v to_o proceed_v from_o the_o pressure_n of_o the_o air._n for_o the_o weight_n of_o the_o atmosphere_n be_v fence_v off_o by_o that_o which_o close_v the_o upper_a end_n of_o the_o long_a tube_n and_o the_o spring_n of_o the_o air_n have_v here_o nothing_o to_o do_v since_o as_o we_o have_v late_o show_v the_o space_n desert_v by_o the_o mercury_n be_v not_o possess_v by_o the_o include_v air_n and_o the_o pulsion_n or_o condensation_n of_o the_o air_n suppose_v by_o divers_a modern_a philosopher_n to_o be_v make_v by_o the_o dilatation_n of_o the_o sucker_n chest_n and_o to_o press_v upon_o the_o surface_n of_o the_o liquor_n that_o be_v to_o be_v suck_v up_o this_o i_o say_v can_v here_o be_v pretend_v in_o regard_n the_o surface_n of_o the_o liquor_n in_o the_o long_a leg_n be_v every_o way_n fence_v from_o the_o pressure_n of_o the_o ambient_fw-la air._n so_o that_o it_o remain_v that_o the_o cause_n which_o raise_v the_o quicksilver_n in_o the_o short_a leg_n upon_o the_o new_o recite_v suction_n be_v the_o weight_n of_o the_o collateral_o superior_a quicksilver_n in_o the_o long_a leg_n which_o be_v at_o the_o begin_n of_o the_o suction_n equivalent_a to_o the_o weight_n of_o the_o atmosphere_n there_o be_v a_o plain_a reason_n why_o the_o stagnant_a mercury_n in_o the_o short_a leg_n shall_v be_v raise_v some_o inch_n by_o suction_n as_o mercury_n stagnant_a in_o a_o open_a vessel_n will_v be_v raise_v by_o the_o weight_n of_o the_o atmosphere_n when_o the_o suction_n be_v make_v in_o the_o open_a air._n for_o in_o both_o case_n there_o be_v a_o pipe_n that_o reach_v to_o the_o stagnant_a mercury_n and_o a_o competent_a weight_n to_o impel_v it_o into_o that_o pipe_n when_o the_o air_n in_o the_o cavity_n of_o the_o pipe_n have_v its_o spring_n weaken_a by_o the_o dilatation_n that_o accompany_v suction_n the_o second_o point_n former_o propose_v which_o be_v that_o the_o weight_n of_o the_o air_n be_v sufficient_a to_o raise_v liquor_n in_o suction_n may_v not_o be_v ill_o prove_v by_o argument_n legitimate_o draw_v from_o the_o torricellian_a experiment_n itself_o and_o much_o more_o clear_o by_o the_o first_o and_o fifteen_o of_o our_o continue_a physicomechanical_a experiment_n and_o therefore_o i_o shall_v only_o here_o take_v notice_n of_o a_o phaenomenon_n that_o may_v be_v exhibit_v by_o the_o travel_a baroscope_n which_o though_o it_o be_v much_o inferior_a to_o the_o experiment_n new_o refer_v to_o may_v be_v of_o some_o use_n on_o the_o present_a occasion_n have_v then_o provide_v a_o instrument_n like_o the_o travel_a baroscope_n mention_v under_o the_o former_a head_n but_o who_o leg_n be_v not_o so_o unequal_o long_a and_o have_v in_o it_o make_v the_o torricellian_a experiment_n after_o the_o manner_n late_o describe_v we_o order_v the_o matter_n so_o that_o there_o remain_v in_o the_o short_a leg_n the_o length_n of_o divers_a inch_n unfilled_a with_o stagnant_a mercury_n then_o i_o cause_v one_o verse_v in_o what_o he_o be_v to_o do_v so_o to_o raise_v the_o quicksilver_n by_o suction_n to_o the_o open_a orifice_n of_o the_o short_a leg_n that_o the_o orifice_n be_v seasonable_o and_o dexterous_o close_v the_o mercury_n continue_v to_o fill_v that_o leg_n as_o long_o as_o we_o think_v fit_a and_o then_o have_v put_v a_o mark_n to_o the_o surface_n of_o the_o mercury_n in_o the_o long_a leg_n we_o unstop_v the_o orifice_n of_o the_o short_a whereupon_o the_o mercury_n that_o before_o fill_v it_o be_v depress_v till_o the_o same_o liquor_n in_o the_o long_a leg_n be_v raise_v five_o inch_n or_o more_o above_o the_o mark_n and_o continue_v at_o that_o height_n i_o say_v that_o the_o mercury_n that_o have_v be_v raise_v by_o suction_n be_v depress_v rather_o than_o that_o it_o subside_v because_o its_o own_o weight_n can_v not_o here_o make_v it_o fall_v since_o a_o mercurial_a cylinder_n of_o five_o inch_n be_v far_o from_o be_v able_a to_o raise_v so_o tall_a a_o cylinder_n of_o mercury_n as_o make_v a_o counterpoise_n in_o the_o long_a leg_n and_o therefore_o the_o depression_n we_o speak_v of_o be_v to_o be_v refer_v to_o the_o gravitation_n of_o the_o atmospherical_a air_n upon_o the_o surface_n of_o the_o mercury_n in_o the_o short_a leg_n and_o i_o see_v no_o cause_n to_o doubt_v but_o that_o if_o we_o can_v have_v procure_v a_o instrument_n into_o who_o short_a leg_n a_o mercurial_a cylinder_n of_o many_o inch_n high_o can_v have_v be_v suck_v up_o it_o will_v by_o this_o contrivance_n have_v appear_v that_o the_o pressure_n of_o the_o atmosphere_n will_v easy_o impel_v up_o a_o far_o tall_a cylinder_n of_o mercury_n than_o it_o do_v in_o our_o recite_v experiment_n that_o this_o be_v no_o groundless_a conjecture_n may_v appear_v probable_a by_o the_o experiment_n you_o will_v present_o meet_v with_o for_o if_o the_o gravity_n of_o a_o incumbent_a pillar_n of_o the_o atmosphere_n be_v able_a to_o compress_v a_o parcel_n of_o include_v air_n as_o much_o as_o a_o mercurial_a cylinder_n equivalent_a in_o weight_n to_o between_o thirty_o and_o five_o and_o thirty_o foot_n of_o water_n be_v able_a to_o condense_a it_o it_o can_v well_o be_v deny_v that_o the_o same_o atmospherical_a cylinder_n may_v be_v able_a by_o its_o weight_n to_o raise_v and_o counterbalance_v eight_o or_o nine_o and_o twenty_o inch_n of_o quicksilver_n or_o a_o equivalent_a pillar_n of_o water_n in_o tube_n where_o the_o resistance_n of_o these_o two_o liquor_n to_o be_v raise_v and_o sustain_v by_o the_o air_n depend_v only_o upon_o their_o own_o unassisted_a gravity_n to_o confirm_v our_o doctrine_n of_o the_o gravitation_n of_o the_o atmosphere_n upon_o the_o surface_n of_o the_o liquor_n expose_v to_o it_o i_o will_v subjoin_v a_o experiment_n that_o i_o devise_v to_o show_v that_o the_o incumbent_a air_n in_o its_o natural_a or_o usual_a state_n will_v compress_v other_o air_n not_o rarify_v but_o in_o the_o like_o natural_a state_n as_o much_o as_o a_o cylinder_n of_o eight_o or_o nine_o and_o twenty_o inch_n of_o mercury_n will_v condense_a or_o compress_v it_o in_o order_n to_o the_o make_n of_o this_o i_o must_v put_v you_o in_o mind_n of_o what_o i_o have_v show_v elsewhere_o at_o large_a 5._o and_o shall_v further_o confirm_v by_o one_o of_o the_o experiment_n that_o follow_v the_o next_o namely_o that_o about_o twenty_o nine_o or_o thirty_o inch_n of_o quicksilver_n will_v compress_v air_n that_o be_v in_o its_o natural_a or_o usual_a state_n as_o to_o rarity_n and_o density_n have_v be_v shut_v up_o in_o the_o short_a leg_n of_o our_o travel_a or_o syphon-like_a baroscope_n into_o half_a the_o room_n that_o include_v air_n possess_v before_o this_o premised_a i_o pass_v on_o to_o my_o experiment_n which_o be_v this_o we_o provide_v a_o travel_a baroscope_n wherein_o the_o mercury_n in_o the_o long_a leg_n be_v keep_v suspend_v by_o the_o counterpoise_n of_o the_o air_n that_o gravitate_v on_o the_o surface_n of_o the_o mercury_n in_o the_o short_a leg_n which_o we_o have_v so_o order_v that_o it_o reach_v not_o by_o about_o two_o inch_n to_o the_o top_n of_o the_o short_a leg_n then_o make_v a_o mark_n at_o the_o place_n where_o the_o stagnant_a mercury_n rest_v it_o be_v manifest_a according_a to_o our_o hypothesis_n that_o the_o air_n in_o the_o upper_a part_n of_o the_o short_a leg_n be_v in_o its_o natural_a state_n or_o of_o the_o same_o degree_n of_o density_n with_o the_o outward_a air_n with_o which_o it_o free_o communicate_v at_o the_o open_a orifice_n of_o the_o short_a leg_n so_o that_o this_o stagnant_a air_n be_v equal_o press_v upon_o by_o the_o weight_n of_o the_o collateral_o superior_a cylinder_n of_o mercury_n in_o the_o long_a leg_n and_o the_o equivalent_a weight_n of_o a_o direct_o incumbent_a pillar_n of_o the_o atmosphere_n thing_n be_v in_o this_o posture_n the_o upper_a part_n of_o the_o short_a leg_n which_o have_v be_v before_o purposely_o draw_v out_o to_o a_o almost_o capillary_a smallness_n be_v hermetical_o seal_v which_o though_o the_o instrument_n be_v keep_v erect_v be_v so_o nimble_o do_v by_o reason_n of_o the_o slenderness_n of_o the_o pipe_n that_o the_o include_v air_n do_v not_o appear_v to_o be_v sensible_o heat_v though_o for_o great_a caution_n
suppose_v in_o nature_n such_o a_o abhorrence_n of_o a_o vacuum_n as_o neither_o have_v be_v well_o prove_v nor_o do_v well_o agree_v with_o the_o late_o discover_v phaenomenon_n of_o suction_n for_o according_a to_o their_o hypothesis_n water_n and_o other_o liquor_n shall_v ascend_v upon_o suction_n to_o any_o height_n to_o prevent_v a_o vacuum_n which_o yet_o be_v not_o agreeable_a to_o experience_n for_o i_o have_v careful_o try_v that_o by_o pump_v with_o a_o pump_n far_o more_o staunch_a than_o those_o that_o be_v usual_o make_v and_o indeed_o as_o well_o close_v as_o we_o can_v possible_o bring_v it_o to_o be_v we_o can_v not_o by_o all_o our_o endeavour_n raise_v water_n by_o suction_n to_o above_o exp._n 36½_n foot_n the_o torricellian_a exp_n t_o show_v that_o the_o weight_n of_o the_o air_n be_v able_a to_o sustain_v and_o some_o of_o our_o experim_n ts_o show_n it_o be_v able_a to_o raise_v a_o mercurial_a cylinder_n equal_a in_o weight_n to_o as_o high_a a_o cylinder_n of_o water_n as_o we_o be_v able_a to_o raise_v by_o pump_v for_o mercury_n be_v near_o 14_o time_n as_o heavy_a as_o water_n of_o the_o same_o bulk_n if_o the_o weight_n of_o the_o air_n be_v equivalent_a to_o that_o of_o a_o mercurial_a cylinder_n of_o 29_o or_o 30_o inch_n it_o must_v be_v able_a to_o counterpoise_v a_o cylinder_n of_o water_n near_o fourteen_o time_n as_o long_o that_o be_v from_o thirty_o four_o to_o near_o thirty_o six_o foot_n and_o very_o disagreeable_a to_o the_o common_a hypothesis_n but_o consonant_a to_o we_o be_v the_o experiment_n that_o i_o have_v more_o than_o once_o try_v and_o i_o think_v elsewhere_o deliver_v namely_o that_o if_o you_o take_v a_o glass_n pipe_n of_o about_o three_o foot_n long_o and_o dip_v one_o end_n of_o it_o in_o water_n suck_v at_o the_o other_o the_o water_n will_v be_v sudden_o make_v to_o flow_v brisk_o into_o your_o mouth_n but_o if_o instead_o of_o water_n you_o dip_v the_o low_a end_n into_o quicksilver_n though_o you_o suck_v as_o strong_o as_o ever_o you_o can_v provide_v that_o in_o this_o case_n as_o in_o the_o former_a you_o hold_v the_o pipe_n upright_o you_o will_v never_o be_v able_a to_o suck_v up_o the_o quicksilver_n near_o so_o high_a as_o your_o mouth_n so_o that_o if_o the_o water_n ascend_v upon_o suction_n to_o the_o top_n of_o the_o same_o pipe_n because_o else_o there_o will_v have_v be_v a_o vacuum_n leave_v in_o the_o cavity_n of_o it_o why_o shall_v not_o we_o conclude_v that_o when_o we_o have_v suck_v up_o the_o quicksilver_n as_o strong_o as_o we_o can_v as_o much_o of_o the_o upper_a part_n of_o the_o tube_n as_o be_v desert_v by_o the_o air_n and_o yet_o not_o fill_v by_o the_o mercury_n admit_v in_o part_n at_o least_o a_o vacuum_n as_o to_o air_n of_o which_o consequent_o nature_n can_v reasonable_o be_v suppose_v to_o have_v so_o great_a and_o unlimited_a a_o abhorrency_n as_o the_o peripatetic_n and_o their_o adherent_n presume_v yet_o i_o will_v not_o determine_v whether_o there_o be_v any_o more_o than_o many_o little_a vacuity_n or_o space_n devoid_a of_o air_n in_o the_o cavity_n so_o call_v of_o the_o pipe_n unfilled_a by_o the_o mercury_n so_o that_o the_o whole_a cavity_n be_v not_o one_o entire_a empty_a space_n it_o be_v sufficient_a for_o my_o purpose_n that_o my_o experiment_n afford_v a_o good_a argument_n ad_fw-la hominem_fw-la against_o the_o peripatetic_n and_o warrant_v we_o to_o seek_v for_o some_o other_o cause_n than_o the_o fuga_fw-la vacui_fw-la why_o a_o much_o strong_a suction_n than_o that_o which_o make_v water_n ascend_v with_o ease_n into_o the_o sucker_n mouth_n will_v not_o also_o raise_v quicksilver_n to_o the_o same_o height_n or_o near_o it_o those_o modern_a philosopher_n that_o admit_v not_o the_o fuga_fw-la vocui_fw-la to_o be_v the_o cause_n of_o the_o raise_n of_o liquor_n in_o suction_n do_v general_o enough_o agree_v in_o refer_v it_o to_o the_o action_n of_o the_o sucker_n thorax_n for_o when_o a_o man_n endeavour_n to_o suck_v up_o a_o liquor_n he_o do_v by_o mean_n of_o the_o muscle_n enlarge_v the_o cavity_n of_o his_o chest_n which_o he_o can_v do_v but_o at_o the_o same_o time_n he_o must_v thrust_v away_o those_o part_n of_o the_o ambient_fw-la air_n that_o be_v contiguous_a to_o his_o chest_n and_o the_o displace_v air_n do_v according_a to_o some_o learned_a man_n therein_o if_o i_o mistake_v not_o followers_z of_o gassendus_fw-la compress_v the_o contiguous_a air_n and_o that_o the_o next_o to_o it_o and_o so_o outward_o till_o the_o pressure_n successive_o pass_v from_o one_o part_n of_o the_o air_n to_o the_o other_o arrive_v at_o the_o surface_n of_o the_o liquor_n and_o all_o other_o place_n be_v as_o to_o sense_n full_a the_o impel_v air_n can_v find_v place_n but_o by_o thrust_v the_o water_n into_o the_o room_n make_v for_o it_o in_o the_o pipe_n by_o the_o recess_n of_o the_o air_n that_o pass_v into_o the_o sucker_n lung_n and_o they_o differ_v not_o much_o from_o this_o explication_n that_o without_o take_v in_o the_o compression_n of_o the_o ambient_fw-la air_n make_v by_o the_o thorax_n refer_v the_o phaenomenon_n to_o the_o propagate_v motion_n or_o impulse_n that_o be_v impress_v on_o the_o air_n displace_v by_o the_o thorax_n in_o its_o dilatation_n and_o yet_o unable_a to_o move_v in_o a_o world_n perfect_o fill_v as_o they_o suppose_v we_o to_o be_v unless_o the_o liquor_n be_v impel_v into_o as_o much_o of_o the_o cavity_n of_o the_o pipe_n as_o fast_o as_o it_o be_v desert_v by_o the_o air_n that_o be_v say_v to_o be_v suck_v up_o but_o though_o i_o ready_o confess_v this_o explication_n to_o be_v ingenious_a and_o such_o as_o i_o wonder_v not_o they_o shall_v acquiess_v in_o who_o be_v acquaint_v but_o with_o the_o long_o know_v and_o obvious_a phaenomena_n of_o suction_n and_o though_o i_o be_o not_o sure_a but_o that_o in_o the_o most_o familiar_a case_n the_o cause_n assign_v by_o they_o may_v contribute_v to_o the_o effect_n yet_o preserve_v for_o cartesius_n and_o gassendus_fw-la the_o respect_n i_o willing_o pay_v such_o great_a philosopher_n i_o must_v take_v the_o liberty_n to_o tell_v you_o that_o i_o can_v acquiess_v in_o their_o theory_n for_o i_o think_v that_o the_o cause_n of_o suction_n they_o assign_v be_v in_o many_o case_n not_o necessary_a in_o other_o not_o sufficient_a and_o first_o as_o to_o the_o condensation_n of_o the_o air_n by_o the_o dilatation_n of_o the_o sucker_n chest_n when_o i_o consider_v the_o extent_n of_o the_o ambient_fw-la air_n and_o how_o small_a a_o compression_n no_o great_a a_o expansion_n than_o that_o of_o the_o thorax_n be_v like_a to_o make_v i_o can_v scarce_o think_v so_o slight_a a_o condensation_n of_o the_o free_a air_n can_v have_v so_o considerable_a a_o operation_n on_o the_o surface_n of_o the_o liquor_n to_o be_v raise_v as_o the_o hypothesis_n i_o examine_v require_v and_o that_o this_o impulse_n of_o the_o air_n by_o a_o sucker_n dilate_a thorax_n though_o it_o be_v wont_a to_o accompany_v the_o ascension_n of_o the_o water_n procure_v by_o suction_n yet_o be_v not_o of_o absolute_a necessity_n to_o it_o will_n i_o presume_v be_v easy_o grant_v if_o it_o can_v be_v make_v out_o that_o even_o a_o propagate_v pulsion_n abstract_v from_o any_o condensation_n of_o air_n be_v not_o so_o necessary_o the_o cause_n of_o it_o but_o that_o the_o effect_n may_v be_v produce_v without_o it_o for_o suppose_v that_o by_o divine_a omnipotence_n so_o much_o air_n as_o be_v displace_v by_o the_o thorax_n be_v annihilate_v yet_o i_o see_v not_o why_o the_o ascension_n of_o the_o liquor_n shall_v not_o ensue_v for_o when_o a_o man_n begin_v to_o suck_v there_o be_v a_o aequilibrium_fw-la or_o rather_o aequipollency_n between_o the_o pressure_n which_o the_o air_n contain_v in_o the_o pipe_n which_o be_v shut_v up_o with_o the_o pressure_n of_o the_o atmosphere_n upon_o it_o have_v by_o virtue_n of_o its_o spring_n upon_o that_o part_n of_o the_o surface_n of_o the_o water_n that_o be_v environ_v by_o the_o side_n of_o the_o pipe_n and_o the_o pressure_n which_o the_o atmospherical_a air_n have_v by_o virtue_n of_o its_o weight_n upon_o all_o the_o rest_n of_o the_o surface_n of_o the_o stagnant_a water_n so_o that_o when_o by_o the_o dilatation_n of_o the_o sucker_n thorax_n the_o air_n within_o the_o cavity_n of_o the_o pipe_n come_v to_o be_v rarify_v and_o consequent_o loose_v of_o its_o spring_n the_o weight_n of_o the_o external_a air_n continue_v in_o the_o mean_a time_n the_o same_o it_o must_v necessary_o happen_v that_o the_o spring_n of_o the_o internal_a air_n will_v be_v too_o weak_a to_o compress_v any_o long_o the_o gravitation_n of_o the_o external_a and_o consequent_o that_o part_n of_o the_o surface_n of_o the_o