the_o mercury_n rise_v in_o the_o small_a leg_n ab_fw-la and_o then_o upon_o admission_n of_o the_o air_n can_v observe_v no_o alteration_n this_o experiment_n be_v often_o repeat_v always_o with_o the_o same_o success_n last_o they_o that_o take_v the_o raise_n of_o fluid_n to_o a_o determinate_a height_n to_o be_v a_o undoubted_a effect_n of_o the_o air_n pressure_n be_v desirous_a to_o see_v if_o the_o air_n which_o press_v upon_o the_o stagnant_a level_n when_o force_v to_o pass_v through_o the_o hole_n of_o a_o very_a small_a cane_n and_o must_v necessary_o do_v so_o to_o exert_v any_o pressure_n come_v thereby_o to_o be_v so_o weaken_v and_o lessen_v that_o any_o observable_a alteration_n follow_v in_o the_o height_n of_o the_o fluid_a so_o press_v which_o they_o think_v will_v probable_o happen_v because_o if_o one_o momentum_fw-la be_v weaken_v the_o other_o must_v certain_o preponderate_v and_o so_o alter_v the_o first_o aequilibrium_fw-la to_o this_o end_n there_o be_v take_v the_o cane_n abcd_v who_o height_n ab_fw-la be_v 46_o inch_n and_o the_o return_v bc_n 11_o ½_o inches_n br._n draw_v to_o a_o great_a degree_n of_o smallness_n than_o be_v represent_v in_o the_o figure_n this_o be_v open_a at_o a_o and_o d_o be_v fill_v with_o mercury_n at_o the_o mouth_n a_o till_o it_o come_v to_o d_o the_o mouth_n of_o the_o return_n which_o we_o then_o seal_v at_o the_o flame_n of_o a_o candle_n and_o complete_v the_o fill_n of_o the_o cane_n to_o a_o and_o tie_v it_o over_o fast_o with_o a_o bladder_n then_o we_o break_v off_o the_o end_n d_o and_o the_o mercury_n begin_v to_o run_v out_o very_o slow_o contrary_a to_o what_o we_o have_v observe_v when_o the_o air_n pursue_v it_o at_o the_o other_o end_n whereas_o instead_o of_o air_n the_o cane_n have_v now_o a_o vacuity_n which_o increase_v gradual_o from_o a_o so_o that_o the_o mercury_n be_v no_o otherwise_o force_v out_o but_o by_o the_o weight_n of_o that_o which_o be_v above_o 28_o 6_o 10_o ¼_n reckon_v from_o c_o towards_o a_o and_o it_o immediate_o stop_v when_o it_o come_v to_o f_o the_o very_a same_o height_n above_o c_o as_o the_o mercury_n be_v off_o in_o another_o tube_n immerse_v in_o a_o large_a vessel_n at_o the_o same_o time_n after_o this_o hold_v the_o cane_n perpendicular_a to_o the_o horizon_n by_o lift_v it_o gentle_o up_o and_o down_o we_o cause_v a_o motion_n in_o the_o mercury_n so_o that_o by_o the_o vibration_n of_o it_o backward_o and_o forward_o in_o the_o two_o arm_n of_o the_o vessel_n there_o run_v out_o at_o each_o vibration_n a_o little_a mercury_n at_o the_o beak_n d_o so_o that_o when_o the_o cane_n and_o mercury_n be_v at_o rest_n there_o remain_v a_o small_a part_n of_o the_o little_a cane_n empty_a of_o mercury_n gcd_n so_o the_o air_n press_v upon_o g_o though_o strain_v through_o so_o narrow_a a_o passage_n as_o d_o yet_o have_v not_o lose_v so_o much_o of_o its_o force_n as_o to_o cause_v any_o sensible_a abatement_n of_o the_o height_n of_o the_o cilind_a f_o c._n from_o all_o these_o experiment_n and_o some_o other_o of_o a_o like_a nature_n which_o we_o have_v now_o no_o time_n to_o relate_v some_o thought_n they_o see_v good_a ground_n to_o affirm_v that_o that_o opinion_n of_o a_o more_o languid_a pressure_n make_v by_o the_o air_n through_o so_o narrow_a conveyance_n take_v absolute_o so_o be_v not_o sufficient_a to_o produce_v this_o and_o the_o like_a effect_n but_o they_o believe_v that_o there_o must_v be_v at_o least_o allow_v some_o other_o concurrent_a cause_n a_o experiment_n of_o water_n in_o vacuo_fw-la that_o noble_a observation_n of_o mr._n boil_v of_o the_o boil_a of_o warm_a water_n in_o vacuo_fw-la make_v we_o above_o measure_n curious_a not_o only_o to_o see_v so_o rare_a and_o surprise_v a_o effect_n but_o also_o give_v we_o a_o hint_n and_o desire_v to_o try_v the_o same_o experiment_n with_o simple_a water_n and_o also_o with_o water_n bring_v to_o as_o great_a a_o degree_n of_o cold_a as_o it_o be_v capable_a of_o without_o freeze_a there_o be_v put_v into_o the_o vessel_n represent_v by_o fig._n 5._o tab._n 10._o a_o quantity_n of_o natural_a water_n unaltered_a from_o its_o ordinary_a temperament_n in_o this_o after_o the_o vacuum_n be_v make_v there_o appear_v a_o shower_n of_o small_a drop_n which_o though_o they_o be_v in_o great_a plenty_n yet_o come_v very_o slow_a and_o the_o water_n lose_v nothing_o of_o its_o transparency_n their_o motion_n be_v upward_o till_o the_o shower_n gradual_o cease_v the_o water_n become_v sedate_v and_o quiet_a as_o at_o first_o the_o warm_a water_n as_o soon_o as_o ever_o the_o vacuum_n be_v make_v begin_v violent_o to_o boil_v up_o towards_o the_o top_n of_o the_o vessel_n with_o a_o noise_n not_o unlike_a that_o make_v by_o a_o cauldron_n boil_v very_o fast_o but_o upon_o open_v the_o ball_n and_o take_v out_o the_o include_v vessel_n we_o can_v not_o observe_v any_o heat_n acquire_v by_o this_o ebullition_n the_o chill_v water_n throw_v up_o four_o or_o five_o small_a bubble_n and_o then_o rest_v without_o any_o other_o sensible_a change_n or_o alteration_n note_v that_o upon_o the_o admission_n of_o the_o air_n the_o shower_n of_o small_a drop_n cease_v immediate_o in_o that_o water_n of_o a_o natural_a temperament_n as_o likewise_o the_o boil_a of_o the_o warm_a water_n a_o experiment_n of_o snow_n in_o vacuo_fw-la at_o first_o we_o put_v in_o a_o small_a piece_n of_o snow_n of_o which_o upon_o the_o fall_n of_o the_o mercury_n there_o scarce_o appear_v other_o than_o the_o melt_a water_n this_o so_o hasty_a dissolution_n thereof_o seem_v strange_a to_o we_o wherefore_o to_o make_v the_o experiment_n more_o clear_a we_o repeat_v it_o with_o a_o large_a piece_n make_v somewhat_o cilindrical_a as_o long_o and_o big_a as_o can_v be_v put_v into_o the_o ball_n which_o be_v fill_v with_o mercury_n we_o thrust_v the_o cilind_a of_o snow_n into_o it_o but_o slip_v out_o of_o his_o hand_n that_o immerse_v it_o and_o so_o swim_v upon_o the_o mercury_n we_o may_v perceive_v that_o in_o the_o very_a act_n of_o immersion_n the_o mercury_n have_v prey_v upon_o and_o eat_v off_o a_o good_a part_n thereof_o and_o the_o dissolve_a water_n swim_v upon_o the_o mercury_n so_o we_o conclude_v that_o it_o be_v the_o mercury_n which_o melt_v the_o first_o small_a piece_n of_o snow_n so_o sudden_o and_o not_o the_o vacuum_n as_o at_o the_o first_o view_n it_o seem_v to_o be_v wherefore_o put_v the_o snow_n in_o again_o close_v the_o vessel_n and_o make_v the_o vacuum_n the_o little_a that_o remain_v be_v as_o slow_a in_o dissolve_v as_o it_o use_v to_o be_v in_o the_o air_n this_o experiment_n be_v make_v in_o the_o summer_n so_o that_o the_o snow_n be_v not_o in_o flake_n solla_fw-it we_o call_v the_o snow_n at_o florence_n when_o it_o fall_v like_o down_o before_o it_o be_v freeze_v together_o but_o some_o of_o that_o take_v out_o of_o the_o conservatory_n where_o it_o be_v tread_v down_o and_o press_v together_o a_o experiment_n of_o the_o dissolution_n of_o pearl_n and_o coral_n in_o vacuo_fw-la this_o experiment_n we_o owe_v likewise_o to_o mr._n boil_v which_o be_v after_o this_o manner_n pearl_n and_o coral_n as_o be_v well_o know_v be_v dissolve_v in_o vinegar_n though_o this_o action_n proceed_v very_o slow_o in_o the_o open_a air_n and_o consist_v in_o the_o curious_a discharge_n of_o very_o small_a bubble_n which_o rise_v from_o body_n of_o the_o pearl_n and_o coral_n themselves_o yet_o they_o do_v not_o rise_v so_o thick_a as_o to_o hinder_v the_o transparency_n of_o the_o vinegar_n especial_o from_o the_o coral_n which_o if_o not_o fine_o powder_v be_v much_o slow_a in_o dissolve_v but_o pearl_n be_v soft_a afford_v a_o great_a plenty_n of_o bubble_n we_o desire_v to_o see_v each_o of_o they_o several_o in_o vacuo_fw-la and_o observe_v so_o great_a a_o quantity_n of_o bubble_n to_o arise_v from_o each_o that_o the_o vinegar_n be_v raise_v all_o in_o froth_n and_o run_v over_o the_o vessel_n which_o therefore_o show_v as_o if_o it_o have_v be_v full_a of_o milk_n or_o pure_a snow_n then_o we_o give_v admission_n to_o the_o air_n whereby_o the_o froth_n be_v immediate_o sink_v and_o the_o vinegar_n with_o its_o natural_a transparency_n begin_v to_o act_v as_o before_o we_o will_v not_o omit_v here_o a_o effect_n accidental_o observe_v in_o this_o dissolution_n which_o be_v this_o the_o pearl_n when_o they_o sink_v to_o the_o bottom_n gather_v into_o one_o or_o more_o little_a bubble_n of_o air_n which_o natural_o rise_v up_o carry_v the_o pearl_n with_o they_o but_o as_o soon_o as_o ever_o the_o bubble_n rise_v above_o the_o vinegar_n and_o by_o the_o chock_n of_o the_o air_n break_v their_o cover_v be_v curious_o scatter_v about_o
the_o seat_n of_o fire_n and_o that_o by_o no_o other_o than_o by_o the_o natural_a gravity_n of_o those_o humid_a part_n be_v by_o mean_n of_o the_o coalition_n with_o it_o attemper_v by_o the_o new_a acquire_v levity_n however_o this_o may_v be_v in_o confirmation_n of_o this_o opinion_n we_o will_v produce_v only_o two_o experiment_n who_o weight_n may_v perchance_o make_v up_o the_o deficiency_n of_o their_o number_n tab._n 18._o p._n 119._o the_o first_o experiment_n 1._o let_v there_o be_v a_o cilind_a of_o wood_n abc_n who_o base_a bc_n exact_o touch_v the_o horizontal_a plane_n de_fw-fr and_o that_o the_o ambient_fw-la air_n get_v between_o the_o two_o superficies_n may_v not_o hinder_v the_o trueness_n of_o their_o contact_n let_v the_o base_a of_o the_o cilind_a be_v line_v with_o a_o plate_n of_o metal_n plain_v and_o well_o polish_a and_o another_o like_a piece_n lead_v into_o the_o horizontal_a plane_n then_o make_v a_o ridge_n with_o wax_n or_o plaster_n round_o about_o the_o cilind_a pour_v mercury_n into_o the_o trench_n up_o to_o f_o that_o the_o contact_n may_v be_v every_o way_n cover_v and_o hinder_v from_o the_o ingress_n of_o the_o air_n then_o fasten_v the_o end_n of_o the_o cilind_a a_o to_o one_o of_o the_o equal_a arm_n of_o a_o beam_n gh_o who_o centre_n be_v i_o at_o the_o other_o end_n h_n hang_v the_o weight_n i_o equal_a to_o that_o of_o the_o cilind_a abc_n it_o be_v manifest_a to_o sense_n that_o to_o raise_v the_o cilind_a from_o the_o plane_n the_o weight_n l_o be_v insufficient_a but_o several_a weight_n must_v be_v add_v to_o the_o end_n h_n till_o at_o last_o suppose_v l_o and_o m_o raise_v it_o resist_v now_o with_o a_o double_a force_n that_o be_v with_o that_o of_o its_o own_o weight_n equal_a to_o l_o and_o with_o that_o of_o the_o contact_n or_o repugnance_n to_o vacuity_n or_o what_o else_o it_o may_v be_v term_v the_o superadded_a weight_n m_o must_v not_o only_o equal_a but_o exceed_v the_o power_n of_o the_o say_v superficial_a contact_n 2._o to_o measure_v this_o force_n which_o in_o our_o instrument_n be_v about_o 3_o l._n put_v the_o cilind_a into_o a_o cilindrical_a vessel_n of_o wood_n or_o potter_n clay_n glaze_v nop_n of_o a_o equal_a or_o great_a height_n therewith_o that_o the_o base_a of_o the_o cilind_a may_v touch_v exact_o the_o plane_n of_o the_o vessel_n bottom_n let_v that_o also_o be_v cover_v with_o a_o polish_a metal_n or_o ground_n glass_n then_o pour_v quicksilver_n into_o the_o vessel_n np_n to_o what_o height_n you_o please_v even_o to_o the_o top_n of_o the_o cilind_a which_o will_v never_o separate_v it_o from_o the_o bottom_n but_o if_o with_o the_o hand_n you_o move_v the_o base_a bc_n from_o the_o plane_n open_v it_o will_v with_o great_a force_n rise_v up_o and_o swim_v upon_o the_o quick_a silver_n seek_v then_o how_o great_a this_o raise_v power_n be_v suppose_v to_o proceed_v from_o lightness_n by_o we_o it_o be_v so_o find_v we_o load_v the_o top_n of_o the_o cilind_a a_o with_o so_o much_o weight_n q_n as_o will_v sink_v it_o to_o the_o bottom_n which_o weight_n in_o our_o experiment_n be_v about_o 5_o l._n we_o conclude_v the_o force_n inquire_v to_o be_v so_o much_o next_o we_o consider_v that_o the_o resistance_n of_o the_o contact_n of_o the_o superficies_n be_v no_o more_o than_o 3_o l._n as_o be_v say_v and_o the_o force_n of_o the_o suppose_a levity_n of_o the_o cilind_a be_v find_v to_o be_v 5_o l_o wherefore_o in_o this_o case_n that_o of_o the_o levity_n be_v more_o than_o that_o of_o the_o contact_n wherefore_o again_o consider_v the_o cilind_a of_o wood_n ab_fw-la close_v down_o with_o its_o base_a bc_n to_o the_o plane_n open_v there_o be_v then_o two_o contrary_a power_n act_v viz._n that_o of_o 5_o l._n from_o the_o levity_n to_o raise_v it_o and_o that_o of_o 3_o l._n from_o the_o contact_n which_o hold_v it_o down_o now_o the_o lesser_a force_n ought_v to_o yield_v to_o the_o great_a and_o so_o the_o cilind_a be_v raise_v but_o it_o be_v not_o so_o here_o for_o the_o contact_n be_v not_o loose_v wherefore_o it_o seem_v we_o must_v conclude_v something_o beside_o levity_n buoy_v it_o up_o the_o second_o experiment_n 3._o let_v there_o be_v a_o wooden_a vessel_n abcd_v in_o the_o thickness_n of_o the_o bottom_n whereof_o a_o concave_a hemisphere_n be_v turn_v efg_n exact_o fit_v a_o ball_n of_o ivory_n h_n adapt_v to_o its_o great_a circle_n eglantine_n then_o the_o whole_a vessel_n be_v fill_v with_o mercury_n so_o that_o the_o globe_n be_v quite_o cover_v therewith_o it_o be_v manifest_a that_o the_o weight_n of_o the_o mercury_n incumbent_a upon_o the_o bottom_n of_o the_o vessel_n and_o hinder_v from_o run_v between_o the_o low_a convex_v of_o the_o ball_n and_o concave_a of_o the_o vessel_n by_o the_o closeness_n of_o the_o contact_n at_o the_o circumference_n eglantine_n be_v not_o able_a by_o descend_v thither_o to_o raise_v the_o ball_n by_o pulsion_n but_o the_o natural_a levity_n of_o the_o ivory_n if_o there_o be_v any_o such_o thing_n may_v easy_o buoy_v it_o up_o in_o the_o heavy_a ambient_fw-la of_o the_o quicksilver_n but_o this_o do_v not_o follow_v the_o ball_n remain_v unmoved_a in_o its_o socket_n under_o any_o height_n of_o mercury_n nor_o can_v it_o be_v object_v that_o nature_n avoid_v a_o vacuum_n which_o must_v follow_v upon_o the_o first_o loosen_a of_o the_o ball_n from_o the_o concave_n of_o the_o vessel_n hinder_v the_o natural_a levity_n of_o the_o ball_n from_o its_o effect_n for_o though_o we_o make_v a_o hole_n through_o the_o bottom_n of_o the_o vessel_n fi_n whereby_o the_o air_n have_v admission_n to_o fill_v the_o space_n leave_v void_a upon_o sever_a the_o ball_n yet_o for_o all_o this_o it_o be_v not_o raise_v and_o because_o it_o may_v be_v say_v that_o the_o ball_n be_v touch_v by_o the_o air_n below_o be_v not_o light_a but_o heavy_a than_o it_o we_o again_o stop_v up_o the_o hole_n and_o enlarge_v the_o socket_n as_o it_o appear_v elg_n so_o that_o only_o the_o edge_n or_o upper_a circle_n of_o the_o hole_n eglantine_n remain_v equal_a to_o the_o great_a circle_n of_o the_o ball_n but_o the_o hemisphere_n efg_n be_v not_o now_o fit_v to_o the_o concave_a elg_n as_o be_v plain_a in_o the_o figure_n we_o then_o fill_v elg_n with_o mercury_n and_o forcible_o thrust_v down_o the_o ball_n till_o its_o great_a circle_n touch_v the_o edge_n of_o the_o concave_n now_o though_o it_o be_v but_o slight_o hold_v by_o the_o circle_n eglantine_n so_o that_o with_o a_o very_a little_a force_n it_o may_v be_v turn_v about_o yet_o we_o fill_v up_o the_o vessel_n with_o mercury_n and_o it_o be_v not_o raise_v nor_o move_v 4._o last_o that_o it_o may_v not_o be_v suspect_v that_o the_o mercury_n pour_v on_o by_o press_v upon_o the_o ball_n hold_v it_o down_o with_o its_o weight_n from_o swim_v we_o take_v instead_o of_o the_o ball_n h_o a_o conical_a glass_n vessel_n abcd_v and_o fit_v a_o lesser_a circle_n thereof_o to_o the_o edge_n of_o and_o pour_v mercury_n round_o about_o it_o it_o keep_v still_o unmoved_a and_o to_o be_v satisfy_v if_o the_o suppose_a tenacious_a union_n between_o the_o glass_n and_o the_o mercury_n together_o with_o nature_n fuga_fw-la vacui_fw-la be_v able_a to_o surpass_v the_o power_n of_o the_o glass_n levity_n we_o try_v the_o force_n of_o that_o contact_n by_o take_v away_o the_o mercury_n from_o about_o the_o glass_n and_o fasten_v of_o it_o to_o the_o one_o terminus_n of_o a_o equal_a balance_n gh_o hang_v a_o weight_n i_o at_o the_o other_o h_n till_o the_o glass_n be_v loosen_v from_o the_o socket_n of_o which_o weight_n be_v with_o we_o about_o a_o pound_n than_o fill_v the_o vessel_n again_o with_o mercury_n we_o set_v the_o glass_n to_o swim_v therein_o and_o load_v it_o as_o in_o the_o other_o experiment_n till_o it_o sink_v it_o to_o the_o bottom_n and_o keep_v it_o there_o this_o weight_n which_o with_o we_o be_v about_o 2_o ½_o l._n may_v be_v the_o true_a measure_n of_o the_o momentum_fw-la believe_v to_o proceed_v from_o the_o levity_n of_o the_o glass_n abcd_v which_o be_v more_o than_o that_o whereby_o it_o resist_v a_o vacuity_n which_o be_v but_o one_o pound_n then_o if_o the_o lightness_n be_v that_o which_o cause_v the_o glass_n to_o swim_v it_o will_v have_v produce_v its_o effect_n dissolve_v the_o contact_n since_o its_o force_n be_v much_o great_a than_o that_o of_o the_o contact_n resist_v it_o but_o it_o do_v not_o do_v it_o therefore_o it_o seem_v that_o the_o same_o be_v confirm_v by_o this_o second_o experiment_n which_o be_v conclude_v from_o the_o former_a viz._n that_o it_o be_v some_o other_o cause_n beside_o the_o levity_n that_o lift_v up_o
the_o admirable_a design_n and_o find_v out_o all_o the_o measure_n and_o proportion_n of_o so_o beautiful_a a_o order_n when_o he_o aim_v to_o penetrate_v too_o deep_a into_o the_o truth_n frame_v to_o himself_o a_o indefinite_a number_n of_o falsity_n which_o proceed_v from_o no_o other_o cause_n but_o his_o ambition_n to_o take_v those_o wing_n nature_n never_o design_v perchance_o fear_v to_o be_v some_o time_n or_o other_o discover_v by_o he_o unwilling_o in_o the_o preparation_n of_o her_o great_a work_n yet_o upon_o these_o he_o begin_v to_o raise_v himself_o and_o though_o charge_v with_o the_o weight_n of_o a_o material_a body_n stretch_v forth_o these_o pinion_n to_o soar_v high_a than_o the_o scale_n of_o sense_n lead_v and_o fix_v himself_o upon_o that_o light_n who_o ray_n too_o powerful_a for_o his_o eye_n dazzle_v and_o blind_v he_o thus_o we_o see_v from_o man_n rashness_n the_o first_o seed_n of_o false_a notion_n come_v from_o which_o yet_o it_o happen_v not_o that_o 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experiment_n to_o show_v more_o evident_o that_o where_o the_o pressure_n of_o the_o air_n be_v want_v the_o bear_n up_o of_o the_o fluid_n be_v lessen_v in_o a_o cane_n of_o any_o length_n and_o upon_o the_o return_n of_o the_o same_o pressure_n raise_v up_o again_o tab_n 5_o p_o 29_o note_v that_o kl_n be_v about_o the_o fourteen_o part_n of_o the_o whole_a height_n of_o the_o water_n ml_o for_o what_o cause_n may_v be_v tell_v present_o but_o when_o it_o do_v exceed_v it_o as_o it_o may_v sometime_o happen_v it_o be_v from_o two_o cause_n first_o either_o the_o water_n wherewith_o the_o vessel_n be_v fill_v be_v not_o pour_v in_o so_o hot_a that_o the_o vacuum_n leave_v by_o it_o in_o condense_v be_v capable_a of_o receive_v all_o the_o quick_a silver_n fall_v from_o the_o cane_n of_o for_o when_o the_o space_n ai_fw-fr leave_v by_o the_o condense_a water_n be_v fill_v by_o the_o subside_v mercury_n which_o fall_v into_o the_o vessel_n gb_n raise_v all_o the_o water_n there_o can_v 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vessel_n fg_v will_v be_v empty_a and_o likewise_o as_o in_o the_o former_a experiment_n part_v of_o the_o cane_n ch_z where_o the_o water_n will_v rest_v nor_o move_v but_o upon_o some_o alteration_n of_o the_o external_n heat_v and_o cold_a but_o upon_o prick_v the_o bladder_n the_o air_n forcible_o enter_v upon_o the_o level_n of_o the_o water_n in_o the_o vessel_n will_v refill_z the_o cane_n as_o at_o first_o it_o be_v think_v by_o some_o that_o the_o water_n in_o the_o cane_n do_v not_o fall_v at_o first_o when_o the_o vacuum_n be_v make_v to_o the_o same_o level_n with_o that_o in_o the_o vessel_n suppose_v the_o space_n agnostus_n capable_a of_o receive_v it_o it_o may_v be_v from_o a_o cause_n mention_v in_o a_o forego_n experiment_n i._n e._n from_o some_o air_n which_o raise_v itself_o from_o the_o water_n into_o the_o void_a space_n perhaps_o too_o narrow_a for_o its_o full_a expansion_n whence_o they_o imagine_v that_o if_o the_o experiment_n be_v make_v with_o wine_n oil_n spirit_n of_o wine_n and_o other_o liquor_n from_o a_o great_a or_o lesser_a vacuum_n remain_v in_o the_o cane_n it_o may_v be_v determine_v which_o of_o the_o fluid_n have_v most_o air_n disperse_v through_o its_o particle_n a_o experiment_n first_o make_v in_o france_n and_o after_o by_o our_o academy_n whence_o it_o be_v probable_a a_o more_o cogent_a argument_n for_o the_o pressure_n of_o the_o air_n may_v be_v draw_v m._n pecquet_n in_o his_o book_n of_o new_a anatomical_a experiment_n write_v that_o it_o have_v be_v observe_v by_o many_o that_o the_o height_n of_o the_o mercurial_a cilind_a in_o vacuo_fw-la vary_v according_a to_o the_o place_n where_o the_o experiment_n be_v make_v whence_o in_o high_a place_n it_o be_v less_o and_o in_o low_a place_n and_o deep_a pit_n great_a provide_v the_o height_n be_v pretty_a considerable_a as_o that_o of_o the_o high_a mountain_n of_o auvergne_n at_o the_o top_n whereof_o the_o mercury_n want_v much_o of_o the_o usual_a height_n 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wonderful_o intend_v the_o freeze_a and_o if_o beside_o the_o strong-water_n you_o add_v salt_n it_o will_v prove_v most_o powerful_a nay_o sugar_n produce_v such_o a_o effect_n but_o not_o much_o in_o comparison_n of_o common_a salt_n nitre_n and_o sal-armoniac_a which_o we_o find_v much_o more_o successful_a in_o the_o operation_n of_o freeze_a than_o all_o the_o rest_n the_o six_o experiment_n touch_v what_o metal_n preserve_v ice_n best_a put_v ice_n in_o vessel_n of_o several_a different_a metal_n to_o observe_v which_o keep_v it_o the_o long_a unthaw_v yet_o of_o this_o we_o can_v obtain_v nothing_o certain_a though_o we_o may_v say_v at_o large_a from_o a_o very_a great_a number_n of_o experiment_n which_o we_o make_v that_o it_o be_v preserve_v best_o of_o all_o in_o lead_n very_o well_o in_o tin_n argento_n but_o a_o short_a time_n in_o copper_n and_o iron_n less_o in_o gold_n and_o yet_o a_o lesser_a time_n in_o silver_n nevertheless_o at_o sometime_o this_o order_n be_v 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snow_n in_o the_o vessel_n begin_v to_o alter_v with_o the_o strong_a water_n or_o salt_n there_o be_v also_o a_o exhalation_n or_o cloudy_a moist_a vapour_n rise_v up_o as_o it_o seem_v from_o the_o bottom_n of_o the_o vessel_n whence_o proceed_v a_o very_a cold_a air_n which_o beside_o that_o it_o sensible_o affect_v the_o hand_n be_v likewise_o more_o discernible_a by_o the_o agitation_n which_o it_o cause_v in_o the_o flame_n of_o a_o candle_n bring_v near_o it_o this_o experiment_n we_o repeat_v by_o put_v ice_n sprinkle_v with_o strong_a water_n and_o salt_n in_o several_a vessel_n of_o different_a figure_n and_o metal_n acquarzente_fw-la to_o observe_v if_o either_o the_o one_o or_o the_o other_o afford_v any_o variety_n in_o the_o smoke_n and_o as_o to_o the_o material_n we_o can_v not_o perceive_v any_o diversity_n whether_o the_o cup_n be_v of_o glass_n earth_n wood_n metal_n or_o precious_a stone_n but_o as_o to_o the_o figure_n it_o seem_v to_o we_o that_o whereas_o in_o 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willing_a to_o try_v if_o a_o concave_a glass_n set_v before_o a_o mass_n of_o 500_o l._n of_o ice_n make_v any_o sensible_a repercussion_n of_o cold_a upon_o a_o very_a nice_a thermometer_n of_o 400_o deg_n place_v in_o its_o focus_n the_o truth_n be_v it_o immediate_o begin_v to_o subside_o but_o by_o reason_n of_o the_o nearness_n of_o the_o ice_n it_o be_v doubtful_a whether_o the_o direct_a or_o reflect_v ray_n of_o cold_a be_v more_o efficacious_a upon_o this_o account_n we_o think_v of_o cover_v the_o glass_n and_o whatever_o may_v be_v the_o cause_n the_o spirit_n of_o wine_n do_v indeed_o present_o begin_v to_o rise_v for_o all_o this_o we_o dare_v not_o be_v positive_a but_o there_o may_v be_v some_o other_o cause_n thereof_o beside_o the_o want_n of_o the_o reflection_n from_o the_o glass_n since_o we_o be_v deficient_a in_o make_v all_o the_o trial_n necessary_a to_o clear_v the_o experiment_n experiment_n touch_v a_o effect_n of_o heat_n and_o cold_a late_o observe_v as_o 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upon_o the_o first_o immersion_n into_o cold_a water_n or_o ice_n yet_o they_o not_o only_o subside_o again_o to_o the_o former_a height_n but_o continue_v to_o do_v so_o for_o many_o degree_n till_o at_o last_o sometime_o after_o a_o little_a rest_n sometime_o without_o any_o they_o all_o remount_v oil_n and_o spirit_n of_o wine_n except_v until_o the_o whole_a freeze_a be_v finish_v this_o effect_n be_v by_o some_o attribute_v to_o a_o cause_n much_o favour_v by_o several_a follow_a experiment_n their_o apprehension_n be_v that_o the_o appearance_n of_o this_o sudden_a motion_n in_o water_n and_o other_o fluid_n be_v not_o real_o from_o any_o intrinsic_n alteration_n of_o rarity_n or_o density_n at_o that_o moment_n wrought_v in_o their_o natural_a temperament_n by_o the_o power_n of_o any_o tab._n 15._o p._n 105._o contrary_a quality_n of_o the_o outward_o apply_v ambient_fw-la which_o some_o by_o a_o note_a word_n call_v antiperistasis_n but_o rather_o to_o speak_v first_o of_o the_o subside_v upon_o the_o immersion_n of_o vessel_n in_o hot_a water_n their_o thought_n be_v that_o it_o come_v from_o the_o fix_v of_o several_a volatile_a corpuscle_n of_o the_o fire_n evaporate_v from_o the_o hot_a water_n into_o the_o external_a pore_n of_o the_o glass_n which_o as_o so_o many_o wedge_n force_v and_o separate_v the_o part_n thereof_o must_v necessary_o distend_v and_o enlarge_v the_o internal_a capacity_n thereof_o till_o they_o find_v a_o way_n through_o the_o hide_a passage_n of_o the_o glass_n to_o the_o liquor_n therein_o contain_v that_o on_o the_o other_o side_n cold_a bind_v up_o and_o contract_v those_o pore_n of_o the_o glass_n make_v the_o vessel_n become_v too_o scanty_a for_o the_o bulk_n of_o water_n in_o it_o before_o that_o bulk_n of_o water_n yet_o unaffected_a by_o the_o cold_a contract_v likewise_o in_o fine_a that_o the_o
vessel_n be_v first_o sensible_a of_o cold_a or_o heat_n by_o shrink_v or_o enlarge_n itself_o also_o first_o be_v the_o true_a cause_n of_o that_o phenomenon_n of_o the_o rise_n or_o fall_v as_o it_o become_v more_o straight_o or_o large_a to_o the_o contain_v liquor_n yet_o not_o vitiate_a by_o the_o quality_n of_o the_o ambient_fw-la this_o opinion_n be_v render_v more_o probable_a to_o we_o by_o the_o follow_a experiment_n a_o experiment_n prove_v that_o in_o the_o instant_a that_o the_o external_n heat_v or_o cold_a dilate_v or_o contract_v the_o vessel_n yet_o than_o the_o natural_a temperament_n of_o the_o liquor_n therein_o contain_v be_v unaltered_a smalto_n we_o include_v in_o a_o globe_n of_o glass_n fill_v with_o water_n several_a small_a bubble_n of_o colour_a glass_n empty_a and_o seal_v hermetical_o these_o be_v all_o near_a the_o specific_a gravity_n of_o the_o water_n by_o mean_n of_o the_o air_n they_o have_v in_o they_o whence_o the_o floater_n upon_o the_o top_n 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dilatation_n in_o vessel_n contain_v a_o ounce_n and_o half_a at_o most_o amount_n but_o to_o a_o grain_n whence_o proportionable_o how_o small_a will_v that_o be_v in_o vessel_n of_o a_o few_o grain_n content_a such_o as_o our_o thermometer_n of_o 50_o deg_n which_o be_v the_o most_o convenient_a and_o exact_a and_o upon_o that_o account_n most_o make_v use_v of_o to_o discover_v the_o alteration_n of_o the_o air_n now_o to_o manifest_v by_o divers_a way_n even_o to_o sense_n the_o truth_n of_o this_o phenomenon_n we_o make_v the_o follow_a experiment_n which_o first_o found_v in_o the_o theory_n be_v confirm_v by_o the_o effect_n the_o first_o experiment_n show_v the_o alteration_n of_o the_o size_n of_o a_o brass-ring_n put_v in_o the_o fire_n and_o in_o ice_n its_o figure_n still_o remain_v unaltered_a there_o be_v order_v to_o be_v cast_v a_o ring_n of_o brass_n 3_o and_o by_o turn_v it_o be_v fit_v exact_o to_o a_o cilind_a of_o the_o same_o metal_n this_o be_v put_v in_o the_o fire_n for_o a_o short_a space_n and_o then_o be_v put_v upon_o the_o cilind_a while_o hot_a it_o be_v sensible_o loose_a be_v dilate_v by_o the_o heat_n into_o a_o ring_n of_o the_o same_o shape_n it_o be_v of_o before_o but_o its_o concavity_n be_v 9_o 100_o part_n large_a when_o it_o have_v remain_v some_o time_n upon_o the_o cilind_a and_o have_v communicate_v its_o heat_n thereto_o between_o the_o increase_n of_o that_o and_o the_o shrink_n of_o the_o ring_n by_o little_a and_o little_a as_o it_o cool_v they_o not_o only_o come_v to_o fit_v as_o at_o first_o but_o be_v so_o firm_o unite_v that_o before_o they_o be_v quite_o cold_a a_o considerable_a force_n be_v but_o requisite_a to_o separate_v they_o the_o contrary_a in_o all_o respect_v happen_v when_o we_o intense_o freeze_v the_o ring_n the_o second_o experiment_n whereby_o it_o appear_v that_o body_n be_v dilate_v by_o the_o imbibe_v of_o moisture_n as_o well_o as_o by_o the_o insinuation_n of_o heat_n 5._o we_o make_v a_o conical_a ring_n of_o box_n who_o concave_a superficies_n be_v curious_o turn_v and_o polish_a there_o be_v also_o make_v a_o stock_n or_o conical_a mandril_n of_o steel_n turn_v and_o well_o smooth_v and_o nice_o divide_v with_o many_o circle_n parallel_v to_o the_o base_a fit_v the_o ring_n upon_o this_o we_o mark_v which_o of_o those_o circle_n the_o bottom_n thereof_o just_a touch_v take_v it_o off_o we_o let_v it_o lie_v in_o water_n three_o whole_a day_n that_o it_o may_v have_v time_n to_o penetrate_v through_o the_o whole_a stubstance_n of_o the_o wood_n then_o we_o put_v it_o on_o again_o and_o observe_v that_o the_o concavity_n be_v stretch_v the_o bottom_n of_o the_o ring_n fall_v much_o low_a upon_o the_o stock_n than_o it_o do_v at_o first_o this_o ring_n be_v make_v two_o several_a way_n in_o one_o the_o ligneous_a fibres_n be_v perpendicular_a in_o the_o other_o parallel_n to_o the_o plane_n of_o the_o basis_n the_o first_o after_o soak_v in_o the_o water_n keep_v its_o 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three_o experiment_n which_o discover_v more_o evident_o the_o readiness_n of_o glass_n to_o contract_n and_o dilate_v itself_o upon_o heat_n and_o cold._n brac._n there_o be_v make_v a_o hollow_a ring_n of_o glass_n as_o in_o the_o figure_n about_o two_o foot_n in_o diameter_n with_o two_o funnel_n that_o when_o the_o liquor_n be_v pour_v in_o at_o one_o the_o air_n may_v have_v vent_n at_o the_o other_o then_o be_v make_v a_o cross_n of_o glass_n just_a to_o touch_v with_o its_o extremity_n the_o concave_a of_o our_o hollow_a ring_n ciambella_n and_o fill_v the_o vessel_n with_o hot_a water_n by_o the_o funnel_n as_o it_o proceed_v in_o dilate_v itself_o so_o visible_o either_o the_o one_o or_o the_o other_o of_o the_o glass_n rod_n lose_v their_o hold_n for_o they_o do_v not_o bear_v equal_o