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proposition_n that_o the_o proper_a action_n of_o the_o heart_n be_v the_o constriction_n of_o its_o ventricles_n and_o the_o consequent_a compression_n and_o expression_n of_o the_o blood_n contain_v in_o they_o not_o by_o a_o contorsion_n of_o its_o spiral_n fibres_n but_o by_o a_o inflation_n and_o corrugation_n of_o they_o here_o some_o perhaps_o may_v be_v willing_a to_o propose_v to_o i_o this_o question_n if_o it_o be_v true_a that_o in_o the_o systole_n or_o act_n of_o pulsation_n neither_o the_o exterior_a superfice_n of_o the_o heart_n be_v augment_v nor_o the_o cone_n of_o it_o draw_v up_o towards_o the_o basis_n both_o which_o we_o have_v assert_v how_o then_o come_v it_o that_o in_o every_o systole_n the_o cone_n of_o the_o heart_n knock_v against_o the_o left_a side_n of_o the_o breast_n which_o may_v be_v thus_o answer_v because_o the_o heart_n be_v hang_v in_o the_o middle_n of_o the_o breast_n by_o strong_a ligament_n and_o yet_o in_o every_o systole_n be_v bring_v to_o touch_v and_o strike_v the_o inside_n of_o the_o breast_n therefore_o it_o be_v necessary_a that_o this_o be_v do_v either_o by_o a_o dilatation_n of_o the_o heart_n or_o by_o local_a motion_n and_o translation_n of_o it_o or_o by_o erection_n of_o the_o whole_a or_o by_o flexion_n and_o incurvation_n of_o the_o cone_n thereof_o and_o as_o our_o observation_n and_o experience_n reject_v the_o three_o former_a cause_n of_o this_o phaenomenon_n so_o it_o oblige_v we_o to_o embrace_v and_o acquiesce_v in_o the_o last_o wherefore_o it_o remain_v only_o that_o we_o investigate_v the_o mechanic_n reason_n of_o this_o effect_n which_o seem_v to_o depend_v first_o upon_o the_o disposition_n of_o the_o fibre_n of_o the_o heart_n for_o we_o see_v that_o a_o crooked_a gut_n tie_v about_o with_o a_o thread_n and_o not_o whole_o fill_v with_o water_n be_v by_o the_o weight_n of_o the_o water_n extend_v direct_o or_o in_o a_o strait_a line_n but_o if_o the_o water_n be_v impel_v towards_o either_o end_n by_o compression_n than_o the_o gut_n become_v crooked_a again_o as_o the_o nature_n of_o it_o exact_v and_o the_o other_o pendulous_a extremity_n will_v be_v erect_v and_o strike_v against_o your_o hand_n hold_v a_o little_a over_o it_o this_o plain_o follow_v from_o the_o curve_v figure_n of_o the_o membrane_n of_o the_o gut_n which_o be_v long_o in_o the_o convex_a part_n and_o short_a in_o the_o concave_n so_o in_o the_o left_a part_n of_o the_o ventricle_n of_o the_o heart_n the_o left_a wall_n be_v short_a less_o fleshy_a and_o less_o crooked_a than_o the_o two_o wall_n that_o make_v the_o right_a ventricle_n wherefore_o in_o the_o systole_n of_o the_o heart_n the_o cone_n of_o it_o ought_v to_o be_v erect_v towards_o the_o left_a side_n of_o the_o breast_n and_o to_o strike_v against_o it_o more_o or_o less_o strong_o according_a to_o the_o degree_n of_o violence_n with_o which_o it_o be_v erect_v this_o may_v be_v somewhat_o help_v also_o partly_o by_o the_o erection_n of_o the_o heart_n lie_v oblique_o partly_o by_o the_o situation_n and_o disposition_n of_o the_o fibre_n which_o be_v wind_v about_o oblique_o and_o spiral_o from_o the_o right_a side_n of_o the_o basis_n of_o the_o heart_n towards_o the_o left_a side_n of_o the_o cone_n whence_o in_o the_o act_n of_o pulsation_n when_o the_o fibre_n be_v shorten_v the_o cone_n may_v be_v a_o little_a distort_a and_o erect_v by_o the_o fasciculus_fw-la or_o combination_n of_o fibres_n forward_o towards_o the_o left_a side_n and_o so_o the_o percussion_n may_v be_v make_v seneca_n as_o you_o may_v remember_v in_o epist_n 57_o most_o elegant_o describe_v first_o the_o inevitable_a horror_n that_o invade_v he_o while_o he_o be_v pass_v through_o the_o dust_n and_o darkness_n a_o darkness_n so_o thick_a as_o even_o to_o be_v see_v of_o the_o crypta_fw-la neapolitana_n now_o name_v the_o grot_n of_o pausilype_n in_o the_o way_n between_o naples_n and_o putzole_n and_o then_o the_o cheerfulness_n he_o call_v it_o alacritatem_fw-la incogitatam_fw-la &_o injussam_fw-la that_o return_v to_o his_o mind_n upon_o the_o first_o sight_n of_o the_o restore_a light_n the_o same_o surprise_a alacrity_n methinks_v i_o now_o feel_v within_o myself_o after_o my_o passage_n through_o the_o no_o less_o darkness_n in_o which_o nature_n have_v through_o a_o long_a series_n of_o age_n involve_v her_o great_a secret_n of_o the_o motion_n of_o the_o heart_n make_v more_o obscure_a by_o the_o dust_n of_o man_n various_a opinion_n and_o my_o arrive_v at_o the_o light_n of_o knowledge_n both_o what_o be_v the_o proper_a action_n of_o the_o heart_n and_o by_o what_o mechanic_n necessity_n that_o action_n be_v perform_v in_o the_o ardour_n of_o this_o alacrity_n i_o proceed_v to_o the_o use_n and_o action_n of_o the_o ear_n of_o the_o heart_n and_o of_o its_o valve_n the_o end_n of_o the_o vena_fw-la cava_fw-la which_o be_v conjoin_v to_o the_o heart_n be_v as_o have_v be_v say_v before_o in_o great_a animal_n musculose_o round_o about_o that_o the_o trunk_n of_o it_o may_v be_v constringe_v as_o sphincter_n be_v close_v by_o virtue_n of_o their_o circular_a fibre_n but_o the_o end_n of_o the_o vena_fw-la pulmonaris_n want_v the_o like_a fulciment_n and_o therefore_o can_v constringe_v itself_o then_o both_o these_o vein_n end_v into_o the_o musculose_a ear_n which_o be_v hollow_a like_o little_a bag_n affix_v to_o the_o side_n of_o the_o heart_n and_o who_o structure_n much_o resemble_v that_o by_o which_o the_o left_a ventricle_n of_o the_o heart_n be_v contex_v in_o the_o hollow_a part_n of_o it_o for_o the_o ear_n also_o consist_v of_o fleshy_a fibres_n intersect_v each_o other_o like_o a_o st._n andrews_n cross_n which_o within_o be_v bind_v together_o into_o many_o little_a cylindrical_a column_n and_o trench_n connect_v the_o side_n of_o the_o bag_n to_o these_o ear_n succeed_v three_o membrane_n in_o the_o right_a ventricle_n and_o two_o in_o the_o left_a which_o be_v of_o a_o very_a strong_a contexture_n of_o a_o triangular_a figure_n the_o base_n of_o which_o be_v close_o affix_v to_o the_o whole_a circuit_n of_o the_o tendon_n of_o the_o orifice_n of_o the_o heart_n then_o the_o areae_fw-la or_o middle_a space_n of_o these_o little_a membrane_n be_v branch_v within_o the_o ventricles_n of_o the_o heart_n into_o many_o little_a tendinose_n string_n or_o cord_n which_o be_v fasten_v to_o the_o top_n of_o the_o papillae_fw-la or_o teat_n that_o stand_v point_v upward_o place_v on_o the_o opposite_a side_n now_o this_o admirable_a structure_n be_v know_v let_v we_o inquire_v the_o design_n or_o use_v of_o it_o first_o the_o extreme_a part_n of_o the_o vena_fw-la cava_fw-la seem_v not_o to_o be_v make_v musculose_o for_o strength_n lest_o it_o shall_v be_v break_v by_o the_o current_n of_o the_o blood_n rush_v in_o but_o rather_o by_o its_o constriction_n to_o protrude_v the_o blood_n into_o the_o oblique_a sinus_n of_o the_o right_a ear_n and_o to_o render_v the_o same_o turgid_a which_o action_n be_v help_v by_o the_o peristaltic_a constriction_n of_o the_o whole_a trunk_n of_o the_o vena_fw-la cava_fw-la and_o by_o the_o compression_n of_o the_o muscle_n and_o viscera_n of_o the_o whole_a body_n as_o be_v yesterday_o demonstrate_v when_o we_o consider_v the_o motion_n of_o the_o blood_n hence_o it_o come_v that_o the_o blood_n impel_v through_o the_o open_a aperture_n of_o the_o ear_n fill_v the_o cavity_n of_o it_o and_o then_o run_v into_o the_o right_a ventricle_n and_o by_o the_o like_a necessity_n the_o blood_n flow_v out_o of_o the_o vena_fw-la pulmonaris_fw-la into_o the_o left_a ear_n and_o thence_o into_o the_o left_a ventricle_n of_o the_o heart_n no_o soon_o be_v the_o ear_n fill_v and_o distend_v with_o blood_n but_o they_o both_o at_o the_o same_o time_n constringe_v themselves_o by_o a_o contractive_a and_o compressive_a action_n common_a to_o all_o muscle_n resemble_v that_o of_o a_o press_n in_o this_o order_n that_o first_o by_o shut_v their_o aperture_n they_o hinder_v the_o regress_n of_o the_o blood_n into_o the_o same_o vein_n out_o of_o which_o it_o come_v in_o then_o by_o the_o great_a force_n of_o compression_n they_o squeeze_v it_o into_o the_o ventricles_n of_o the_o heart_n until_o they_o be_v fill_v and_o make_v turgid_a to_o this_o action_n of_o the_o ear_n immediate_o succeed_v the_o compression_n of_o the_o press_n of_o the_o heart_n itself_o by_o which_o the_o blood_n itself_o by_o reason_n of_o its_o abundance_n inflate_v and_o distend_v the_o triangular_a and_o mitral_a valve_n exact_o shut_v the_o orifice_n or_o mouth_n of_o the_o vein_n and_o so_o prevent_v its_o own_o recoil_n into_o they_o whence_o it_o be_v of_o absolute_a necessity_n that_o the_o same_o blood_n be_v express_v into_o the_o pulmonary_a artery_n or_o vena_fw-la arterialis_fw-la and_o into_o the_o aorta_fw-la these_o be_v the_o
action_n and_o use_v of_o the_o ear_n and_o valve_n of_o the_o heart_n first_o discover_v by_o our_o immortal_a dr._n harvey_n and_o since_o confirm_v by_o various_a experiment_n of_o other_o excellent_a anatomist_n be_v then_o certain_a of_o the_o phaenomena_n it_o remain_v only_o that_o we_o endeavour_v to_o explore_v the_o mechanic_n cause_v of_o they_o in_o the_o first_o place_n because_o the_o ear_n of_o the_o heart_n be_v muscle_n round_o hollow_a and_o compose_v of_o fleshy_a fibre_n wound_v about_o spiral_o and_o intersect_v each_o the_o other_o decussatim_fw-la and_o because_o they_o end_v into_o little_a column_n and_o trench_n in_o the_o same_o manner_n as_o the_o left_a ventricle_n be_v frame_v therefore_o must_v they_o operate_v by_o the_o same_o mechanic_n necessity_n and_o artifice_n by_o which_o the_o heart_n operate_v viz._n by_o the_o force_n of_o a_o press_n and_o by_o wedge_n insinuate_v into_o the_o pore_n of_o their_o fibre_n they_o must_v be_v swell_v and_o so_o constringed_a and_o consequent_o express_v the_o blood_n contain_v in_o they_o second_o that_o the_o constriction_n of_o these_o ear_n aught_o to_o precede_v the_o contraction_n of_o the_o ventricles_n of_o the_o heart_n though_o both_o motion_n seem_v to_o be_v perform_v at_o one_o time_n may_v be_v thus_o demonstrate_v for_o if_o this_o be_v not_o true_a then_o either_o the_o ear_n and_o ventricles_n of_o the_o heart_n be_v constringe_v in_o one_o and_o the_o same_o moment_n of_o time_n or_o the_o heart_n be_v first_o constringe_v and_o then_o the_o ear_n if_o the_o first_o because_o the_o triangular_a valve_n have_v no_o use_n before_o the_o heart_n be_v constringe_v nor_o after_o the_o constriction_n of_o it_o be_v complete_a because_o the_o shut_n of_o the_o valve_n will_v be_v in_o vain_a when_o the_o blood_n can_v flow_v back_o and_o slow_a back_n it_o can_v before_o the_o heart_n be_v constringe_v because_o then_o the_o blood_n be_v not_o yet_o in_o the_o ventricles_n and_o so_o can_v be_v impel_v by_o the_o systole_n of_o the_o heart_n and_o after_o the_o constriction_n of_o the_o heart_n the_o expulsate_a blood_n can_v much_o less_o flow_v back_o therefore_o it_o be_v necessary_a that_o at_o what_o time_n the_o ventricles_n be_v constringe_v at_o the_o same_o time_n the_o venose_n orifice_n ought_v to_o be_v exact_o shut_v by_o the_o triangular_a valve_n that_o the_o blood_n may_v be_v impel_v not_o backward_o but_o forward_o into_o the_o artery_n but_o if_o at_o that_o same_o time_n the_o ear_n be_v constringe_v they_o will_v inevitable_o vomit_v out_o the_o blood_n contain_v in_o they_o into_o the_o ventricles_n and_o so_o open_a the_o clausure_n make_v by_o the_o triangular_a valve_n because_o they_o be_v so_o dispose_v as_o to_o be_v open_v and_o dilate_a by_o the_o very_a come_n of_o the_o blood_n wherefore_o at_o the_o same_o time_n the_o blood_n will_v be_v impel_v by_o the_o ear_n into_o the_o heart_n and_o repel_v by_o the_o heart_n and_o so_o these_o two_o contrary_a motion_n will_v mutual_o destroy_v each_o the_o other_o and_o both_o be_v in_o vain_a beside_o when_o two_o outlet_n be_v at_o the_o same_o time_n open_a in_o one_o ventricle_n of_o the_o heart_n the_o whole_a compressive_a force_n of_o the_o heart_n be_v divide_v into_o two_o equal_a part_n which_o impel_v the_o two_o half_n of_o the_o blood_n one_o backward_o the_o other_o forward_o into_o the_o artery_n and_o therefore_o nature_n will_v foolish_o by_o a_o double_a endeavour_n attain_v but_o half_o her_o end_n we_o may_v add_v that_o the_o triangular_a valve_n will_v be_v whole_o useless_a since_o they_o will_v then_o urgente_a necessitate_v be_v open_a when_o they_o ought_v to_o be_v shut_v wherefore_o it_o seem_v impossible_a that_o the_o ear_n of_o the_o heart_n and_o its_o ventricles_n shall_v be_v constringe_v at_o the_o same_o time_n but_o if_o we_o suppose_v the_o natural_a order_n to_o be_v invert_v i._n e._n that_o first_o the_o ventricles_n of_o the_o heart_n be_v constringe_v and_o then_o the_o ear_n compress_v this_o will_v be_v much_o more_o absurd_a for_o half_a of_o the_o blood_n contain_v in_o the_o ventricle_n will_v flow_v back_o into_o the_o ear_n on_o both_o side_n open_a and_o thence_o into_o the_o vein_n it_o must_v therefore_o be_v confess_v that_o the_o constriction_n of_o the_o ear_n ought_v to_o precede_v and_o then_o immediate_o ought_v the_o constriction_n of_o the_o ventricle_n to_o succeed_v and_o then_o all_o the_o operation_n proceed_v regular_o and_o compendious_o for_o the_o ear_n be_v compress_v first_o the_o regress_n of_o the_o blood_n into_o the_o vein_n be_v hinder_v next_o the_o blood_n be_v express_v out_o of_o the_o ear_n into_o the_o cavity_n of_o the_o heart_n three_o the_o orifice_n of_o the_o heart_n be_v shut_v by_o the_o constringed_a ear_n four_o the_o ventricle_n of_o the_o heart_n be_v fill_v with_o blood_n and_o distend_v the_o membrane_n of_o the_o triangular_a valve_n be_v expanded_a these_o action_n be_v in_o this_o order_n of_o succession_n do_v then_o in_o the_o five_o place_n follow_v the_o swell_a of_o the_o heart_n by_o which_o all_o the_o blood_n in_o the_o ventricles_n which_o can_v by_o reason_n of_o the_o double_a clausure_n slow_a back_n be_v force_v to_o run_v forth_o by_o the_o open_a door_n of_o the_o artery_n three_o it_o be_v observable_a that_o the_o action_n of_o the_o right_a ear_n differ_v from_o that_o of_o the_o left_a because_o the_o blood_n ought_v to_o flow_v out_o of_o the_o arteria_fw-la venosa_fw-la or_o as_o some_o call_v it_o the_o vena_fw-la pulmonaria_fw-la which_o be_v very_o ample_a into_o the_o left_a ventricle_n of_o the_o heart_n with_o a_o swift_a current_n by_o reason_n of_o its_o gravity_n and_o of_o the_o compression_n of_o the_o lung_n for_o this_o reason_n a_o little_a ear_n be_v sufficient_a to_o transmit_v the_o blood_n so_o swift_o run_v into_o the_o left_a ventricle_n and_o with_o the_o help_n of_o the_o mitral_a valve_n also_o exact_o to_o shut_v the_o aperture_n of_o the_o heart_n on_o the_o contrary_a in_o the_o right_a ear_n the_o slowness_n of_o the_o blood_n influx_n ought_v to_o be_v compensated_a by_o the_o amplitude_n of_o the_o canale_n and_o moreover_o because_o the_o right_a ear_n ought_v not_o only_o to_o close_v the_o orifice_n of_o the_o heart_n but_o also_o to_o impel_v rapid_o the_o slow_a pace_a blood_n into_o the_o right_a ventricle_n therefore_o nature_n have_v make_v the_o muscle_n and_o cavity_n of_o the_o right_a ear_n strong_a and_o large_a than_o that_o of_o the_o left_a four_o we_o may_v far_o gratify_v our_o curiosity_n by_o consider_v the_o manner_n how_o the_o triangular_a valve_n exact_o shut_v the_o orifice_n of_o the_o heart_n which_o seem_v to_o be_v this_o because_o these_o membranose_a valve_n have_v their_o base_n fasten_v to_o one_o part_n of_o the_o circular_a tendon_n of_o the_o orifice_n of_o the_o heart_n as_o flag_n be_v fasten_v to_o their_o staff_n and_o their_o other_o side_n be_v by_o many_o tendinose_a filament_n or_o string_n fasten_v to_o the_o fleshy_a teat_n in_o the_o opposite_a part_n of_o the_o cavity_n of_o the_o ventricle_n as_o web_n of_o linen_n expose_v to_o the_o sun_n be_v keep_v upon_o the_o stretch_n by_o many_o small_a cord_n tie_v on_o each_o side_n hence_o it_o come_v that_o by_o the_o stream_n of_o blood_n rush_v in_o the_o cavity_n of_o the_o ventricles_n be_v dilate_v and_o so_o these_o membranose_a valve_n which_o before_o be_v lax_n and_o flag_v be_v draw_v and_o expanded_a transvers_o so_o as_o to_o spread_v themselves_o through_o the_o whole_a space_n of_o the_o orifice_n necessary_a it_o be_v therefore_o that_o the_o point_n and_o side_n of_o these_o triangular_a valve_n thus_o draw_v by_o the_o little_a cord_n decussated_a shall_v be_v conjoin_v and_o be_v conjoin_v make_v one_o conical_a superfice_n great_a than_o the_o plane_n of_o the_o orifice_n or_o of_o the_o circle_n of_o the_o basis_n of_o the_o same_o cone_n after_o this_o follow_v the_o systole_n of_o the_o heart_n when_o the_o inside_n of_o the_o wall_n of_o the_o ventricles_n be_v unite_v and_o therefore_o those_o little_a cord_n of_o the_o valve_n be_v at_o the_o same_o time_n relax_v and_o unite_v also_o and_o so_o the_o face_n of_o the_o triangular_a valve_n themselves_o must_v be_v unite_v and_o acquire_v a_o sinuose_fw-la or_o embow_v figure_n their_o superfice_n not_o diminish_v because_o their_o membrane_n be_v not_o contract_v whence_o it_o come_v that_o the_o blood_n fill_v the_o ventricle_n do_v by_o repel_v the_o membrane_n and_o inflate_v they_o bow_v they_o as_o the_o sail_n of_o ship_n swell_v by_o the_o wind_n be_v bow_v into_o a_o hollowness_n again_o since_o those_o membrane_n thus_o embow_v be_v transfer_v towards_o the_o tendinose_a orifice_n of_o the_o heart_n the_o round_a area_n of_o
act_v continual_o but_o interrupt_o or_o per_fw-la vice_n short_a and_o almost_o isochronic_a or_o equal_a quiet_n interpose_v so_o that_o the_o blood_n express_v by_o the_o heart_n do_v not_o flow_v thence_o in_o a_o continue_a course_n as_o river_n and_o fountain_n do_v that_o be_v without_o intermission_n carry_v on_o by_o the_o weight_n of_o their_o water_n but_o gush_v forth_o and_o stop_v alternate_o though_o this_o vicissitude_n be_v exact_o regular_a and_o proceed_v in_o a_o constant_a order_n now_o these_o thing_n consider_v it_o may_v seem_v consentaneous_a to_o conclude_v that_o the_o motion_n of_o the_o blood_n can_v be_v continuus_fw-la since_o two_o pause_n or_o quiet_n be_v interpose_v betwixt_o every_o two_o pulsation_n or_o systole_n of_o the_o heart_n during_o each_o of_o which_o the_o motion_n cease_v but_o on_o the_o contrary_a aught_o to_o be_v esteem_v and_o call_v a_o interrupt_a and_o mix_v motion_n and_o yet_o notwithstanding_o the_o verisimilitude_n of_o this_o conclusion_n i_o doubt_v not_o to_o lay_v down_o and_o expose_v to_o your_o examination_n this_o first_o proposition_n that_o the_o blood_n be_v carry_v in_o a_o round_a through_o the_o body_n of_o a_o animal_n in_o a_o true_o continue_v and_o never_o interrupt_v motion_n this_o perhaps_o may_v sound_v like_o a_o paradox_n but_o that_o shall_v not_o a-whit_n discourage_v i_o from_o assert_v it_o while_o i_o remember_v that_o remarkable_a sentence_n of_o minutius_n felix_n in_o octavio_n inest_fw-la &_o in_fw-la incredibili_fw-la verum_fw-la &_o in_o verisimili_fw-la mendacium_fw-la though_o it_o be_v true_a and_o evident_a that_o the_o heart_n do_v not_o in_o the_o time_n of_o its_o pause_n express_v any_o blood_n into_o the_o artery_n yet_o it_o be_v not_o true_a that_o the_o blood_n contain_v in_o the_o artery_n in_o the_o viscera_n in_o the_o habit_n of_o the_o body_n and_o in_o the_o vein_n do_v at_o the_o same_o time_n stagnate_n and_o stop_v its_o course_n but_o on_o the_o contrary_n be_v always_o carry_v on_o in_o its_o journey_n though_o with_o unequal_a velocity_n first_o the_o verity_n of_o this_o appear_v in_o the_o artery_n for_o the_o afflux_n of_o blood_n from_o the_o heart_n be_v whole_o intercept_v either_o by_o a_o ligature_n apply_v to_o the_o aorta_fw-mi at_o its_o original_n or_o by_o cut_v out_o the_o heart_n itself_o as_o be_v common_o do_v in_o frog_n and_o viper_n we_o see_v that_o nevertheless_o the_o blood_n wherewith_o the_o artery_n be_v fill_v be_v by_o degree_n squeeze_v out_o so_o that_o they_o be_v soon_o after_o leave_v altogether_o empty_a and_o doubtless_o this_o exinanition_n of_o the_o artery_n happen_v because_o they_o by_o their_o own_o spontaneous_a motion_n constringe_v themselves_o and_o contract_v their_o circular_a fibre_n express_v the_o blood_n into_o the_o habit_n of_o the_o part_n and_o be_v at_o the_o same_o time_n compress_v also_o by_o the_o contraction_n and_o tension_n or_o the_o peristaltic_a motion_n of_o all_o the_o muscle_n of_o the_o body_n from_o the_o observation_n of_o this_o vulgar_a phaenomenon_n viz._n the_o emptiness_n of_o the_o artery_n in_o dead_a body_n the_o ancient_n perhaps_o take_v occasion_n to_o believe_v and_o teach_v that_o not_o blood_n but_o only_o vital_a spirit_n be_v contain_v in_o the_o artery_n second_o this_o appear_v also_o in_o the_o vein_n for_o that_o the_o blood_n do_v continual_o flow_v on_o in_o they_o likewise_o not_o only_a when_o it_o be_v urge_v forward_o by_o the_o arterial_a blood_n pursue_v it_o but_o even_o in_o the_o time_n of_o the_o heart_n pause_n be_v evince_v from_o this_o that_o then_o the_o blood_n run_v on_o through_o the_o trunk_n of_o the_o vena_fw-la cava_fw-la to_o replenish_v the_o right_a ventricle_n of_o the_o heart_n but_o why_o do_v i_o misspend_v time_n in_o allege_v reason_n to_o prove_v a_o truth_n that_o be_v manifest_a to_o sense_n in_o phlebotomy_n no_o soon_o be_v a_o vein_n open_v than_o the_o blood_n flow_v forth_o with_o a_o swift_a stream_n and_o while_o the_o wound_n be_v open_a continues_z to_o flow_v without_o pause_n or_o interruption_n which_o be_v a_o demonstration_n of_o the_o thing_n propose_v viz._n of_o the_o continual_a motion_n of_o the_o blood_n in_o the_o vein_n be_v thus_o assure_v of_o the_o effect_n let_v we_o proceed_v to_o investigate_v the_o cause_n which_o be_v not_o equal_o evident_a nor_o can_v we_o hope_v certain_o to_o solve_v this_o problem_n without_o inquire_v the_o mechanical_a reason_n of_o the_o continual_a motion_n of_o the_o blood_n through_o the_o vein_n this_o therefore_o i_o will_v now_o attempt_v to_o do_v that_o nature_n have_v institute_v no_o immediate_a communication_n betwixt_o the_o capillary_a artery_n and_o the_o capillary_a vein_n per_fw-la anastomôsin_fw-la be_v manifest_a to_o sense_n and_o now_o acknowledge_v by_o all_o learned_a anatomist_n and_o therefore_o it_o can_v stand_v with_o reason_n to_o imagine_v that_o the_o blood_n in_o its_o circular_a course_n be_v emit_v immediate_o out_o of_o the_o artery_n into_o the_o vein_n these_o vessel_n be_v separate_a and_o though_o we_o opine_n that_o there_o be_v some_o secret_a communication_n betwixt_o the_o extreme_a orifice_n of_o the_o artery_n and_o those_o of_o the_o capillary_a vein_n by_o the_o intermediate_v spongy_a substance_n of_o the_o flesh_n viscera_n and_o glandule_n or_o by_o the_o cribrose_n substance_n of_o the_o bone_n as_o by_o the_o pore_n of_o a_o pumice_n stone_n yet_o we_o be_v still_o to_o seek_v by_o what_o motive_n force_v the_o blood_n may_v be_v carry_v on_o from_o those_o intermediate_v porosity_n and_o insinuate_v into_o the_o vein_n first_o because_o it_o be_v consentaneous_a that_o the_o impulsive_a force_n whereby_o the_o systole_n of_o the_o heart_n squirt_n the_o blood_n into_o the_o artery_n be_v by_o degree_n weaken_v and_o at_o length_n languid_a in_o those_o straits_n of_o the_o extreme_a vessel_n and_o of_o the_o intermediate_v porosity_n second_o because_o the_o orifice_n of_o the_o capillary_a vein_n can_v continue_v always_o open_a and_o dilate_v their_o consistence_n be_v not_o hard_a and_o bony_a but_o membranose_n soft_a and_o slippery_a so_o that_o they_o be_v apt_a to_o be_v close_v by_o connive_v and_o consequent_o to_o hinder_v the_o ingress_n of_o the_o blood_n new_o arrive_v three_o because_o here_o we_o can_v have_v no_o recourse_n to_o the_o compression_n of_o the_o viscera_n and_o the_o muscle_n whereby_o the_o blood_n shall_v be_v squeeze_v into_o the_o orifice_n of_o the_o capillary_a vein_n for_o we_o see_v that_o the_o blood_n be_v suck_v up_o by_o the_o capillary_a vein_n not_o only_a when_o the_o muscle_n be_v invigorate_v and_o upon_o the_o stretch_n but_o also_o when_o they_o be_v quiet_a and_o relax_v and_o do_v not_o exercise_v their_o compressive_a power_n as_o be_v most_o evident_a in_o sleep_n when_o the_o circulation_n proceed_v without_o intermission_n this_o be_v confirm_v from_o hence_o that_o in_o the_o brain_n in_o the_o medullary_a substance_n of_o the_o bone_n where_o no_o compression_n can_v be_v admit_v the_o capillary_a vein_n receive_v the_o blood_n as_o free_o as_o in_o the_o soft_a flesh_n itself_o see_v then_o that_o the_o effect_n can_v be_v deny_v viz._n that_o all_o the_o blood_n effuse_v out_o of_o the_o artery_n be_v after_o absorb_v and_o carry_v off_o by_o the_o vein_n to_o be_v bring_v back_o again_o into_o the_o heart_n and_o see_v also_o that_o this_o be_v not_o effect_v by_o way_n of_o attraction_n there_o be_v no_o such_o thing_n as_o attraction_n in_o nature_n as_o i_o have_v more_o than_o once_o elsewhere_o prove_v we_o be_v compel_v to_o assert_v that_o the_o blood_n be_v imbibe_v by_o the_o capillary_a vein_n for_o the_o same_o reason_n and_o by_o the_o same_o mechanic_n action_n by_o which_o syphon_n sponge_n filtre_n chord_n and_o all_o porose_a body_n be_v penetrate_v by_o water_n with_o which_o they_o be_v moisten_v which_o power_n be_v no_o other_o than_o the_o gravity_n of_o the_o fluid_n itself_o which_o be_v augment_v by_o the_o impetus_fw-la of_o its_o proper_a motion_n and_o by_o the_o impulse_n communicate_v to_o it_o from_o external_a force_n so_o the_o motive_n force_n of_o gravity_n which_o the_o blood_n can_v want_v no_o more_o than_o water_n can_v when_o it_o find_v the_o small_a channel_n of_o the_o capillary_a vein_n open_a for_o they_o can_v never_o be_v so_o close_o constringe_v by_o the_o flag_a and_o connivency_n of_o their_o thin_a membrane_n as_o to_o leave_v no_o entrance_n for_o a_o fluid_a as_o appear_v in_o the_o pore_n of_o rope_n how_o hard_o soever_o twist_v must_v of_o necessity_n overcome_v the_o weak_a resistance_n of_o the_o straits_n in_o all_o filtre_n and_o porose_a body_n and_o consequent_o the_o blood_n may_v be_v insinuate_v into_o the_o capillary_a vein_n by_o a_o mechanic_n action_n like_o that_o of_o filtration_n if_o this_o proposition_n
say_v that_o fibres_n when_o they_o act_v can_v possible_o exercise_v their_o force_n by_o their_o contraction_n and_o by_o draw_v their_o extreme_a term_n towards_o the_o middle_n because_o by_o a_o corrugation_n or_o shrink_v up_o into_o wrinkle_n of_o their_o length_n they_o must_v rather_o be_v relax_v therefore_o as_o a_o weight_n hang_v on_o to_o a_o lax_n cord_n can_v be_v raise_v thereby_o while_o the_o cord_n continue_v lax_n so_o by_o fibres_fw-fr lax_n and_o corrugate_v can_v the_o opposite_a wall_n of_o the_o ventricles_n of_o the_o heart_n be_v violent_o draw_v together_o and_o conjoin_v second_o but_o if_o we_o suppose_v that_o the_o fibrose_a spire_n of_o the_o heart_n be_v not_o wound_v about_o tortuosè_fw-la with_o turn_n and_o wind_n quite_o home_o to_o the_o ventricles_n but_o extend_v in_o a_o direct_a course_n into_o the_o ventricles_n and_o there_o bind_v together_o into_o those_o fasciculi_fw-la or_o sheaf_v which_o compose_v many_o little_a cylinder_n or_o cord_n then_o indeed_o a_o man_n may_v think_v that_o by_o simple_a contraction_n of_o the_o fibre_n those_o little_a cylinder_n may_v be_v total_o shorten_v and_o so_o the_o opposite_a wall_n of_o the_o heart_n be_v bring_v to_o meet_v together_o but_o this_o be_v evident_o impossible_a because_o in_o such_o a_o position_n there_o must_v necessary_o be_v admit_v a_o corrugation_n of_o the_o whole_a concave_a superficies_n of_o the_o heart_n intercept_v betwixt_o the_o base_n of_o those_o little_a column_n or_o cord_n and_o therefore_o innumerable_a fibres_n there_o contex_v must_v be_v crowd_v up_o together_o and_o in_o like_a manner_n corrugate_v i._n e._n relax_v and_o by_o consequence_n can_v not_o act_v by_o their_o tense_n contraction_n which_o be_v repugnant_a to_o the_o supposition_n beside_o in_o the_o right_a ventricle_n of_o the_o heart_n be_v find_v but_o very_o few_o of_o those_o little_a cylinder_n or_o column_n and_o therefore_o this_o subterfuge_n can_v have_v no_o place_n there_o yet_o far_o a_o total_a decurtation_n of_o those_o same_o column_n or_o cord_n can_v not_o be_v make_v unless_o the_o length_n of_o the_o spire_n end_v in_o the_o column_n themselves_o run_v out_o betwixt_o other_o fibre_n as_o into_o sheath_n or_o about_o pulley_n neither_o of_o which_o contrivance_n be_v to_o be_v find_v in_o the_o heart_n for_o the_o fibre_n of_o the_o heart_n be_v with_o decussated_a direction_n contex_v and_o so_o close_o and_o firm_o bind_v among_o themselves_o that_o they_o can_v by_o various_a and_o contrary_a motion_n start_v out_o of_o their_o place_n and_o run_v out_o among_o other_o fibre_n embrace_v they_o in_o fine_a that_o the_o tension_n of_o the_o heart_n can_v be_v solve_v by_o a_o simple_a contraction_n of_o its_o fibre_n as_o heretofore_o have_v be_v common_o imagine_v may_v be_v sufficient_o evince_v even_o from_o this_o that_o the_o bulk_n of_o the_o muscle_n of_o the_o limb_n which_o when_o they_o act_v be_v true_o contract_v be_v sensible_o diminish_v rather_o than_o augment_v but_o the_o bulk_n of_o the_o heart_n while_o it_o act_n be_v augment_v since_o the_o cavity_n or_o ventricles_n of_o it_o be_v fill_v up_o by_o the_o fleshy_a substance_n the_o outward_a figure_n of_o the_o whole_a heart_n be_v at_o the_o same_o time_n unchanged_a and_o undiminish_a wherefore_o the_o proper_a action_n of_o the_o heart_n be_v not_o perform_v by_o contraction_n of_o its_o fibre_n quod_fw-la erat_fw-la probandum_fw-la hence_o arise_v this_o corollary_n that_o the_o cavity_n of_o the_o heart_n be_v constringe_v not_o because_o the_o length_n of_o the_o ventricles_n be_v shorten_v but_o because_o their_o side-wall_n be_v bring_v near_o each_o to_o the_o other_o so_o as_o almost_o to_o touch_v this_o appear_v from_o the_o very_a position_n and_o configuration_n of_o the_o ventricles_n of_o the_o heart_n and_o from_o its_o operation_n for_o the_o left_a ventricle_n dissect_v from_o the_o bottom_n to_o the_o top_n be_v you_o see_v extend_v through_o the_o whole_a length_n of_o the_o heart_n from_o the_o basis_n down_o to_o the_o cone_n which_o end_v into_o a_o sharp_a point_a and_o slender_a wall_n and_o since_o the_o external_a figure_n of_o the_o heart_n while_o it_o beat_v be_v not_o shorten_v therefore_o neither_o be_v the_o length_n of_o this_o cavity_n diminish_v that_o be_v to_o say_v the_o basis_n of_o the_o cavity_n be_v not_o bring_v near_o to_o the_o cone_n of_o it_o beside_o the_o base_a and_o cone_n of_o the_o heart_n can_v at_o all_o be_v inflate_v and_o incrassated_a because_o the_o base_a want_n fibres_n and_o be_v entire_o destitute_a of_o flesh_n as_o be_v whole_o occupy_v by_o the_o four_o ample_a orifice_n of_o the_o vein_n and_o artery_n and_o the_o wall_n of_o the_o cone_n be_v very_o thin_a and_o slender_a therefore_o the_o cavity_n can_v be_v fill_v by_o inflation_n of_o the_o fibre_n of_o the_o basis_n and_o cone_n of_o the_o heart_n it_o remain_v then_o of_o absolute_a necessity_n that_o the_o cavity_n be_v fill_v by_o inflation_n of_o the_o side-wall_n of_o the_o heart_n which_o be_v very_o thick_a full_a of_o fibres_n and_o therefore_o easy_o capable_a of_o inflation_n last_o as_o be_v say_v before_o if_o a_o man_n put_v his_o finger_n into_o a_o hole_n make_v by_o incision_n in_o either_o of_o the_o ventricles_n of_o the_o heart_n of_o any_o animal_n yet_o live_v he_o shall_v perceive_v a_o strong_a constriction_n of_o the_o side-wall_n but_o none_o of_o the_o basis_n and_o cone_n tend_v to_o their_o approximation_n one_o towards_o the_o other_o by_o this_o consectary_n thus_o verify_v we_o be_v lead_v to_o understand_v the_o mechanic_n reason_n of_o this_o operation_n that_o by_o mechanic_n necessity_n the_o cavity_n of_o the_o heart_n can_v be_v shorten_v may_v be_v far_o prove_v thus_o because_o a_o contraction_n of_o the_o heart_n can_v be_v make_v but_o by_o a_o contraction_n of_o its_o fibre_n therefore_o those_o part_n of_o it_o that_o want_n fibres_n will_v not_o be_v capable_a of_o contraction_n but_o of_o that_o immense_a multitude_n of_o fibres_n descend_v from_o the_o basis_n of_o the_o heart_n not_o so_o much_o as_o the_o thousand_o part_n attain_v to_o the_o cone_n because_o if_o they_o shall_v be_v there_o connect_v they_o will_v be_v accumulate_v stratum_fw-la super_fw-la strato_fw-la make_v the_o acuminate_v and_o thin_a wall_n of_o huge_a depth_n or_o thickness_n whereas_o now_o that_o wall_n be_v very_o slender_a in_o such_o a_o situation_n and_o all_o the_o rest_n of_o the_o fibre_n that_o be_v spiral_n be_v weave_v together_o and_o reflect_v into_o the_o heart_n with_o a_o transversal_a circuit_n before_o they_o reach_v to_o the_o cone_n ergo_fw-la they_o will_v not_o be_v able_a to_o draw_v up_o the_o cone_n of_o the_o heart_n towards_o the_o basis_n and_o by_o consequence_n the_o length_n of_o the_o cavity_n of_o the_o heart_n will_v not_o be_v shorten_v but_o the_o cause_n by_o which_o the_o side-wall_n of_o the_o ventricles_n be_v bring_v to_o meet_v be_v this_o because_o almost_o all_o the_o innumerable_a fibres_fw-fr of_o the_o heart_n be_v wound_v oblique_o and_o transvers_o about_o the_o side_n of_o it_o and_o of_o they_o be_v compose_v very_o many_o layer_n one_o above_o another_o like_o membrane_n but_o when_o the_o fibre_n of_o any_o layer_n be_v inflate_v or_o huff_v up_o they_o touch_v each_o the_o other_o lateral_o and_o lie_v in_o one_o superfice_n will_v of_o necessity_n crowd_n and_o press_v each_o the_o other_o lateral_o and_o so_o thrust_v each_o the_o other_o out_o of_o their_o place_n and_o urge_v they_o far_o viz._n sideways_o towards_o the_o basis_n and_o towards_o the_o cone_n wherefore_o the_o interval_n betwixt_o the_o basis_n and_o the_o cone_n ought_v to_o be_v rather_o augment_v but_o because_o the_o other_o external_a fibres_n oblique_o encompass_v and_o close_o gird_v the_o transverse_n and_o intersect_v they_o decussatim_fw-la hinder_v their_o elongation_n and_o protuberance_n it_o come_v to_o pass_v that_o of_o necessity_n the_o inflation_n of_o the_o fibre_n ought_v to_o cause_v they_o to_o swell_v inward_o towards_o the_o cavity_n and_o so_o the_o inside_n of_o the_o wall_n be_v puff_v up_o must_v be_v bring_v near_o together_o moreover_o the_o septum_fw-la cordis_fw-la or_o partition-wall_n of_o the_o ventricles_n consist_v for_o the_o most_o part_n of_o transverse_n fibres_n will_v not_o be_v shorten_v by_o their_o inflation_n but_o the_o thickness_n of_o it_o be_v much_o augment_v and_o the_o outward_a wall_n ought_v likewise_o to_o be_v inflate_v inward_o towards_o the_o internal_a cavity_n therefore_o the_o inside_n of_o the_o opposite_a wall_n ought_v to_o meet_v the_o basis_n remain_v always_o at_o the_o same_o distance_n from_o the_o cone_n quod_fw-la erat_fw-la ostendendum_fw-la hence_o we_o may_v deduce_v this_o genuine_a consectary_n that_o the_o meeting_n of_o the_o opposite_a inside_n of_o the_o wall_n
be_v true_a the_o great_a difficulty_n occur_v in_o the_o whole_a mystery_n of_o the_o circulation_n of_o the_o blood_n be_v now_o at_o length_n solve_v the_o blood_n have_v in_o this_o manner_n pass_v the_o aforesaid_a straits_n and_o enter_v into_o the_o canales_n of_o the_o small_a vein_n by_o the_o same_o motive_n force_n whereby_o it_o be_v insinuate_v for_o such_o a_o ingress_n be_v not_o possible_a without_o motion_n may_v be_v advance_v a_o little_a far_o in_o its_o way_n by_o its_o proper_a force_n and_o by_o external_a force_n and_o also_o by_o the_o impulse_n of_o the_o new_a blood_n follow_v behind_o as_o we_o see_v water_n suck_v up_o by_o a_o filtre_n to_o be_v carry_v on_o to_o the_o end_n of_o the_o list_n afterwards_o because_o many_o small_a vein_n meet_v together_o make_v one_o wide_a ductus_fw-la or_o pipe_n and_o because_o in_o this_o large_a pipe_n the_o former_a impulsive_a force_n of_o necessity_n grow_v more_o and_o more_o languid_a and_o faint_a by_o degree_n and_o by_o consequence_n the_o motion_n of_o the_o blood_n be_v retard_v therefore_o it_o stand_v in_o need_n of_o some_o auxiliary_a force_n to_o be_v carry_v on_o the_o rest_n of_o its_o journey_n these_o be_v first_o the_o force_n by_o which_o the_o circular_a fibre_n of_o the_o vein_n that_o natural_o have_v a_o peristaltic_a virtue_n contract_v themselves_o always_o after_o they_o have_v be_v stretch_v as_o all_o nervose_n and_o other_o tensile_n body_n be_v observe_v to_o do_v second_o the_o compression_n of_o the_o vein_n by_o the_o weight_n of_o the_o circumambient_a air_n or_o atmosphere_n and_o the_o elastic_a virtue_n of_o the_o air_n inspire_v three_o the_o tonic_n motion_n of_o the_o muscle_n when_o they_o act_v together_o with_o the_o various_a motion_n of_o the_o viscera_n and_o of_o humour_n discurrent_fw-la through_o the_o body_n all_o which_o more_o or_o less_o compress_v the_o vein_n now_o that_o the_o manner_n how_o this_o compression_n promote_v the_o continual_a decurse_n of_o the_o blood_n in_o the_o vein_n may_v be_v the_o more_o full_o and_o clear_o understand_v i_o will_v take_v liberty_n to_o lay_v down_o this_o second_o proposition_n that_o by_o the_o artifice_n of_o the_o valve_n the_o compression_n of_o the_o vein_n protrude_v the_o blood_n towards_o the_o heart_n with_o a_o motion_n double_o swift_a not_o indeed_o in_o a_o continual_a flux_n but_o with_o little_a pause_n interpose_v and_o with_o unequal_a velocity_n we_o here_o behold_v in_o the_o crural_a vein_n slit_v open_a from_o end_n to_o end_n i._n certain_a valve_n place_v at_o unequal_a distance_n in_o the_o inside_n of_o the_o vein_n which_o for_o demonstration_n sake_n be_v accurate_o represent_v in_o this_o figure_n expose_v to_o sight_n ii_o these_o valve_n you_o see_v be_v nothing_o but_o half_a pocket_n of_o a_o membranose_a substance_n or_o little_a bladder_n affix_v to_o the_o side_n or_o wall_n of_o the_o vein_n and_o resemble_v by_o aonmp_n and_o bonqr_n they_o be_v find_v sometime_o single_a sometime_o in_o pair_n place_v one_o opposite_a to_o the_o other_o and_o lateral_o touch_v each_o other_o as_o at_z no_z the_o convex_a top_n of_o which_o pair_n respect_v the_o capillary_a beginning_n of_o the_o vein_n beyond_o hl_n but_o the_o orifice_n of_o their_o cavity_n po_n ro_n open_a towards_o the_o heart_n have_v respect_n to_o the_o part_n ik_fw-mi now_o i_o be_o to_o demonstrate_v that_o from_o this_o structure_n and_o situation_n of_o the_o valve_n it_o be_v necessary_a that_o the_o blood_n be_v protrude_v towards_o the_o heart_n imagine_v then_o that_o the_o same_o portion_n of_o the_o vein_n hmql_n be_v replete_a with_o blood_n and_o because_o by_o the_o circular_a fibres_fw-fr of_o the_o vein_n itself_o and_o by_o the_o ambient_fw-la muscle_n and_o perhaps_o also_o by_o the_o gravity_n of_o the_o atmosphere_n one_o part_n of_o the_o vein_n be_v constringe_v after_o another_o all_o along_o it_o must_v be_v that_o the_o lateral_a wall_n st_n come_v near_o to_o each_o other_o towards_o five_o and_o then_o the_o vein_n so_o gird_v will_v lose_v its_o cylindrical_a form_n and_o be_v turn_v into_o two_o little_a funnel_n hul_n muq_n which_o be_v less_o capacious_a than_o the_o former_a cylinder_n and_o therefore_o the_o blood_n which_o be_v contain_v in_o the_o space_n vh_n and_o vlt_n will_v be_v expel_v out_o of_o the_o orifice_n hl_n but_o the_o remain_a quantity_n of_o blood_n contain_v in_o the_o space_n vsm_n and_o vqt_n will_v be_v squeeze_v without_o the_o orifice_n mq_n towards_o ik_fw-mi it_o appear_v then_o that_o from_o the_o abovementioned_a compression_n of_o the_o side_n or_o wall_n of_o the_o vein_n the_o blood_n be_v express_v in_o equal_a quantity_n to_o the_o opposite_a part_n and_o this_o will_v certain_o happen_v if_o the_o valve_n be_v remove_v but_o because_o to_o the_o wall_n of_o the_o vein_n within_o mp_n qr_n be_v fasten_v two_o valve_n it_o be_v necessary_a that_o the_o blood_n impulse_v by_o a_o compression_n make_v in_o st_n be_v force_v through_o the_o narrow_a chink_n no_o because_o the_o yield_a fluid_n contain_v in_o the_o cavity_n of_o the_o valve_n and_o urge_v by_o the_o advenient_a blood_n be_v constringe_v and_o thrust_v out_o of_o they_o and_o then_o instant_o the_o side_n of_o the_o valve_n that_o before_o touch_v each_o other_o no_z recede_v one_o from_o another_o leave_v a_o open_a way_n by_o which_o the_o flux_n of_o blood_n come_v on_o from_o mstq_n may_v be_v insinuate_v and_o pass_v forward_o beyond_o ab_fw-la again_o after_o the_o blood_n have_v pass_v the_o confine_n of_o the_o valve_n po_n ro_n there_o necessary_o follow_v a_o restriction_n of_o the_o little_a chink_n no_o for_o the_o blood_n itself_o must_v by_o reason_n of_o its_o heavy_a bulk_n and_o fluidity_n fill_v the_o little_a bag_n of_o the_o valve_n and_o so_o their_o soft_a and_o pliable_a side_n be_v dilate_v till_o they_o mutual_o touch_v ought_v close_o to_o shut_v the_o rimula_fw-la no_z moreover_o because_o the_o vein_n be_v not_o constringe_v in_o all_o its_o part_n at_o the_o same_o time_n but_o part_n after_o part_n successive_o therefore_o after_o the_o blood_n be_v transfer_v beyond_o the_o valve_n within_o the_o little_a funnel_n abcd_v there_o follow_v a_o constriction_n of_o the_o wall_n ad_fw-la bc_n in_o the_o same_o time_n in_o which_o st_n be_v not_o constringed_a and_o because_o by_o reason_n of_o the_o close_a shut_n of_o the_o rimula_fw-la no_o half_o the_o blood_n that_o be_v contain_v in_o the_o space_n eag_fw-mi fbg_n can_v flow_v back_o towards_o ab_fw-la find_v the_o obstacle_n aob_v fill_v with_o blood_n and_o retain_v by_o the_o valve_n it_o be_v compel_v with_o a_o reflex_n motion_n like_o that_o of_o a_o tennis-ball_n rebound_v from_o the_o wall_n to_o flow_v towards_o dc_o and_o since_o by_o the_o same_o compression_n the_o blood_n that_o be_v contain_v in_o the_o space_n edge_v fcg_n be_v protrude_v beyond_o dc_o therefore_o a_o double_a quantity_n of_o blood_n be_v in_o the_o same_o time_n in_o which_o the_o compression_n be_v make_v expel_v through_o that_o same_o aperture_n dc_o but_o when_o a_o double_a quantity_n of_o a_o fluid_a be_v in_o the_o same_o time_n emit_v at_o the_o same_o orifice_n it_o must_v run_v out_o with_o a_o double_a velocity_n thus_o be_v our_o proposition_n verify_v and_o as_o to_o single_a valve_n from_o what_o have_v be_v say_v of_o the_o use_n of_o double_a it_o may_v easy_o and_o genuine_o be_v infer_v that_o they_o also_o help_v to_o promote_v the_o course_n of_o the_o blood_n though_o but_o half_a so_o much_o as_o the_o double_a wherefore_o nature_n wisdom_n be_v admirable_a in_o place_v single_a valve_n both_o at_o less_o distance_n one_o above_o another_o and_o for_o the_o most_o part_n where_o the_o cavity_n of_o the_o vein_n be_v a_o little_o narrow_a or_o where_o a_o less_o vein_n lateral_o exonerate_v itself_o into_o a_o great_a in_o both_o which_o case_n the_o necessity_n of_o this_o demonstrate_v acceleration_n of_o the_o motion_n of_o the_o blood_n seem_v to_o be_v less_o in_o the_o trunk_n of_o the_o vena_fw-la cava_fw-la no_o valves_n be_v find_v as_o well_o because_o of_o its_o ample_a cavity_n as_o because_o of_o its_o contiguity_n to_o the_o trunk_n of_o the_o great_a artery_n by_o who_o pulsation_n it_o can_v but_o be_v somewhat_o compress_v and_o consequent_o the_o blood_n flow_v through_o it_o proportionate_o promote_v in_o the_o jugular_a vein_n also_o none_o have_v yet_o be_v observe_v probable_o because_o in_o they_o the_o blood_n descend_v swift_o enough_o from_o its_o own_o weight_n and_o fluidity_n in_o small_a vein_n they_o be_v not_o place_v unless_o in_o the_o coronary_a vein_n of_o the_o heart_n just_a at_o the_o place_n where_o they_o empty_v themselves_o into_o the_o right_a ventricle_n of_o the_o heart_n and_o of_o these_o
nay_o that_o he_o understand_v no_o more_o the_o mechanic_n reason_n of_o their_o conformation_n than_o if_o he_o have_v never_o hear_v of_o or_o see_v they_o nor_o in_o truth_n do_v father_n paul_n who_o yet_o i_o never_o can_v mention_v without_o secret_a veneration_n if_o the_o afore-recited_n account_n and_o what_o follow_v immediate_o after_o give_v by_o his_o most_o intimate_a friend_n during_o his_o life_n and_o after_o his_o historian_n fulgentio_n be_v true_a and_o full_a for_o in_o fulgentio_n narration_n of_o the_o manner_n how_o the_o father_n come_v first_o to_o find_v out_o the_o valve_n there_o be_v this_o passage_n and_o upon_o his_o own_o natural_a judgement_n he_o set_v himself_o to_o cut_v with_o more_o exquisite_a observation_n whereupon_o he_o find_v out_o those_o valvulae_fw-la and_o the_o right_a use_n of_o they_o which_o do_v not_o only_o stop_v and_o hinder_v the_o blood_n from_o dilate_v itself_o by_o its_o weight_n into_o the_o vein_n as_o we_o observe_v in_o some_o crooked_a and_o swell_v knot_n but_o also_o that_o blood_n run_v up_o and_o down_o with_o so_o much_o liberty_n and_o in_o so_o great_a quantity_n it_o may_v easy_o suffocate_v the_o natural_a heat_n of_o those_o part_n which_o ought_v to_o receive_v their_o nourishment_n from_o it_o whence_o it_o be_v plain_o apparent_a that_o the_o father_n also_o attribute_v a_o double_a use_n to_o the_o valve_n one_o the_o very_a same_o with_o the_o former_a dream_v of_o by_o aquapendens_fw-la who_o probable_o borrow_v it_o of_o the_o father_n viz._n to_o prevent_v the_o dilatation_n of_o the_o blood_n into_o varices_fw-la by_o stop_v its_o impetuous_a motion_n up_o and_o down_o in_o the_o vein_n the_o other_o quite_o contrary_a to_o aquapendens_n second_o use_n viz._n to_o prevent_v a_o surfeit_n of_o the_o part_n upon_o too_o much_o blood_n and_o a_o extinction_n or_o suffocation_n of_o their_o natural_a heat_n by_o that_o excess_n whereas_o aquapendens_fw-la fear_v they_o will_v be_v famish_a if_o the_o valve_n do_v not_o detain_v their_o food_n as_o tantalus_n be_v feign_v to_o be_v now_o if_o these_o be_v true_o the_o father_n sentiment_n concern_v the_o valve_n certain_o he_o have_v no_o right_a conception_n of_o nature_n design_n in_o make_v they_o as_o may_v be_v collect_v from_o the_o precedent_a demonstration_n of_o their_o true_a use_n to_o come_v then_o to_o a_o conclusion_n and_o draw_v all_o the_o line_n of_o this_o scrutiny_n to_o a_o point_n since_o it_o be_v evident_a that_o neither_o father_n paul_n himself_o nor_o his_o disciple_n aquapendens_fw-la have_v a_o right_a notion_n of_o the_o proper_a use_n of_o the_o valve_n and_o that_o both_o believe_v the_o blood_n to_o flow_v out_o of_o the_o great_a vein_n into_o the_o less_o which_o the_o fabric_n and_o situation_n of_o the_o valve_n plain_o contradict_v it_o necessary_o follow_v that_o neither_o of_o they_o can_v be_v author_n of_o that_o much_o more_o noble_a and_o more_o difficult_a invention_n of_o the_o circulation_n or_o the_o blood_n which_o it_o be_v moral_o impossible_a for_o any_o man_n to_o deduce_v from_o their_o absurd_a opinion_n concern_v the_o use_n of_o the_o valve_n and_o the_o glory_n of_o which_o be_v whole_o due_a to_o that_o incomparable_a man_n dr._n harvy_n who_o by_o admirable_a sagacity_n of_o spirit_n by_o numerose_n experiment_n and_o observation_n anatomical_a and_o by_o assiduous_a meditation_n perhaps_o also_o by_o the_o secret_a manuduction_n of_o fate_n that_o have_v reserve_v the_o secret_a for_o his_o knowledge_n attain_v at_o length_n to_o the_o invidiose_fw-la felicity_n of_o find_v it_o out_o and_o reveal_v it_o to_o the_o world_n i_o wonder_v therefore_o that_o some_o man_n of_o not_o obscure_a name_n in_o the_o catalogue_n of_o anatomist_n have_v show_v themselves_o so_o ungrateful_a and_o envious_a towards_o this_o immortal_a man_n as_o to_o ascribe_v this_o divine_a invention_n to_o padre_n paolo_n i_o mean_v sanguinis_fw-la joh._n walaeus_n and_o tho._n bartholinus_n the_o former_a of_o who_o doubt_v not_o to_o write_v thus_o vir_fw-la incomparabilis_fw-la paulus_n servita_n venetus_n valvularum_fw-la in_o venis_fw-la fabricam_fw-la observavit_fw-la accuratiùs_fw-la quam_fw-la magnus_fw-la anatomicus_n fabricius_n ab_fw-la aquapendente_fw-la postea_fw-la edidit_fw-la &_o ex_fw-la ea_fw-la valvularum_fw-la constitutione_n aliisque_fw-la experimentis_fw-la hunc_fw-la sanguinis_fw-la motum_fw-la puta_fw-la circularem_fw-la deduxit_fw-la egregioque_fw-la scripto_fw-la asseruit_fw-la quod_fw-la etiamnum_fw-la intelligo_fw-la apud_fw-la venetos_n asservari_fw-la ab_fw-la hoc_fw-la servita_n edoctus_fw-la vir_fw-la doctissimus_fw-la gulielmus_fw-la harveius_fw-la sanguinis_fw-la hunc_fw-la motum_fw-la accuratiùs_fw-la indagavit_fw-la inventis_fw-la auxit_fw-la probavit_fw-la firmiùs_fw-la &_o svo_fw-la divulgavit_fw-la nomine_fw-la the_o other_o have_v the_o confidence_n to_o affirm_v 26._o that_o veslingius_n have_v communicate_v to_o he_o as_o a_o secret_a never_o to_o be_v reveal_v forsooth_o to_o any_o three_o person_n that_o the_o circulation_n of_o the_o blood_n be_v the_o invention_n of_o father_n paul_n the_o servite_fw-la who_o have_v write_v a_o book_n of_o it_o which_o be_v in_o the_o custody_n of_o fulgentio_n at_o venice_n to_o refute_v this_o palpable_a fiction_n to_o what_o i_o have_v already_o say_v of_o father_n paul_n ignorance_n of_o the_o right_a use_n of_o the_o valve_n i_o need_v add_v only_o this_o that_o if_o fulgentio_n have_v have_v in_o his_o hand_n any_o such_o manuscript_n of_o the_o father_n as_o these_o detractor_n have_v imagine_v it_o be_v wonderful_a strange_a he_o shall_v never_o so_o much_o as_o mention_v either_o that_o or_o the_o circulation_n in_o his_o whole_a history_n of_o the_o father_n life_n when_o of_o all_o the_o subtle_a speculation_n and_o discovery_n of_o natural_a secret_n by_o he_o attribute_v to_o the_o father_n nothing_o will_v have_v so_o much_o conduce_v to_o the_o propagation_n of_o his_o glory_n as_o that_o here_o therefore_o i_o put_v a_o end_n to_o this_o long_a digression_n to_o which_o the_o necessary_a contemplation_n of_o the_o valve_n give_v a_o invite_a occasion_n and_o which_o be_v intend_v only_o to_o do_v right_a to_o the_o venerable_a memory_n of_o dr._n harvy_n all_o lover_n of_o truth_n as_o well_o as_o all_o member_n of_o this_o noble_a society_n will_v i_o presume_v easy_o pardon_v ¶_o ⸫_o have_v inquire_v into_o the_o velocity_n of_o the_o motion_n of_o the_o blood_n in_o the_o vein_n and_o the_o mechanic_n cause_v thereof_o let_v we_o next_o consider_v the_o velocity_n of_o the_o motion_n of_o the_o same_o blood_n in_o the_o artery_n for_o the_o clear_a understanding_n of_o which_o i_o lay_v down_o this_o three_o proposition_n proposition_n iii_o that_o the_o artery_n of_o a_o animal_n their_o constriction_n or_o pulsation_n be_v complete_a do_v not_o remain_v whole_o empty_a of_o blood_n evident_a it_o be_v even_o to_o sense_n that_o all_o the_o vein_n of_o a_o sanguineous_a animal_n take_v together_o be_v large_a or_o more_o capacious_a perhaps_o in_o a_o quadruple_a proportion_n than_o all_o the_o artery_n put_v together_o and_o the_o whole_a mass_n of_o blood_n run_v through_o all_o both_o vein_n and_o artery_n which_o mass_n in_o fullgrown_a man_n common_o exceed_v not_o 18_o or_o 20_o pint_n and_o though_o the_o vein_n by_o reason_n of_o their_o transparent_a coat_n always_o appear_v full_a of_o blood_n yet_o a_o man_n may_v doubt_v whether_o the_o artery_n also_o be_v always_o full_a that_o be_v whether_o they_o only_o give_v passage_n to_o the_o blood_n in_o the_o time_n of_o the_o pulsation_n and_o then_o in_o the_o time_n of_o their_o quiet_n remain_v whole_o empty_a or_o not_o to_o resolve_v this_o doubt_n therefore_o i_o say_v that_o the_o artery_n if_o they_o be_v whole_o empty_a in_o the_o interval_n of_o their_o pulsation_n then_o be_v lay_v naked_a to_o the_o sight_n they_o will_v appear_v constringe_v and_o lank_a like_a chord_n extend_v but_o our_o eye_n assure_v we_o that_o on_o the_o contrary_n they_o retain_v their_o round_a and_o plump_a figure_n and_o be_v press_v by_o the_o finger_n resist_v the_o pressure_n neither_o of_o which_o can_v possible_o consist_v with_o a_o total_a exinanition_n again_o the_o vein_n be_v lay_v naked_a if_o after_o the_o pulsation_n of_o the_o heart_n the_o artery_n remain_v empty_a then_o certain_o will_v the_o pipe_n of_o the_o vein_n by_o the_o quantity_n of_o 5_o pint_n of_o blood_n crowd_v into_o they_o more_o than_o what_o they_o be_v proportion_v to_o contain_v be_v distend_v at_o least_o a_o three_o part_n more_o than_o they_o ought_v but_o this_o be_v sensible_o false_a for_o their_o coat_n be_v not_o distend_v beyond_o their_o usual_a rate_n ergo_fw-la the_o artery_n be_v at_o no_o time_n whole_o empty_a moreover_o in_o animal_n who_o artery_n be_v transparent_a as_o in_o snake_n viper_n eel_n frog_n etc._n etc._n we_o may_v from_o their_o purple_a or_o bluish_a colour_n perceive_v the_o artery_n to_o be_v full_a of_o
blood_n which_o be_v alone_o sufficient_a to_o evince_v that_o the_o artery_n do_v not_o remain_v empty_a after_o the_o pulsation_n of_o the_o heart_n but_o contain_v at_o least_o a_o 4_o the_o part_n of_o the_o whole_a mass_n of_o blood_n which_o in_o a_o man_n be_v about_o 5_o pint_n yet_o far_o the_o artery_n in_o the_o moment_n of_o their_o pulsation_n be_v high_o turgid_a when_o yet_o not_o above_o 3_o ounce_n of_o blood_n be_v emit_v into_o they_o by_o the_o systole_n of_o the_o heart_n therefore_o if_o before_o the_o systole_n the_o artery_n be_v whole_o empty_a a_o space_n 20_o time_n great_a than_o their_o bulk_n be_v will_v inevitable_o be_v fill_v by_o the_o 3_o ounce_n of_o blood_n emit_v by_o the_o heart_n but_o this_o certain_o be_v impossible_a without_o such_o a_o rarefaction_n of_o the_o blood_n which_o no_o man_n of_o common_a sense_n will_v admit_v therefore_o to_o replenish_v so_o great_a a_o vacuity_n in_o the_o artery_n there_o must_v come_v into_o they_o five_o pint_n of_o blood_n either_o from_o the_o heart_n or_o back_o out_o of_o the_o vein_n but_o neither_o of_o these_o be_v possible_a in_o nature_n let_v we_o add_v that_o 3_o ounce_n of_o blood_n emit_v by_o the_o systole_n of_o the_o heart_n can_v fill_v a_o space_n great_a than_o half_a a_o foot_n of_o the_o next_o artery_n to_o the_o heart_n therefore_o if_o the_o artery_n be_v empty_a before_o the_o systole_n true_o all_o the_o rest_n of_o the_o artery_n will_v remain_v empty_a also_o in_o the_o follow_a systole_n and_o consequent_o can_v not_o beat_v at_o the_o same_o time_n with_o the_o heart_n and_o the_o circulation_n of_o the_o blood_n through_o they_o will_v be_v interrupt_v or_o discontinue_v contrary_a to_o the_o mechanic_a necessity_n thereof_o in_o fine_a we_o be_v convince_v by_o common_a experience_n when_o a_o artery_n whether_o it_o be_v great_a or_o small_a be_v cut_v the_o blood_n be_v in_o every_o pulsation_n squirt_v out_o with_o mighty_a violence_n now_o it_o be_v impossible_a this_o shall_v happen_v unless_o all_o the_o artery_n be_v full_a of_o blood_n all_o along_o from_o their_o beginning_n to_o their_o end_n because_o the_o violence_n of_o the_o stream_n of_o blood_n gush_v from_o the_o incision_n have_v no_o other_o efficient_a cause_n but_o the_o protrusion_n of_o the_o blood_n come_v on_o behind_o and_o urge_v the_o antecedent_n but_o in_o the_o follow_a pulsation_n there_o be_v a_o accession_n of_o no_o more_o than_o 3_o ounce_n of_o blood_n which_o can_v by_o its_o quantity_n replenish_v half_o the_o capacity_n of_o the_o artery_n therefore_o unless_o there_o remain_v after_o every_o pulsation_n 5_o pint_n of_o blood_n in_o the_o artery_n they_o can_v be_v make_v turgid_a again_o in_o the_o follow_a pulsation_n so_o that_o nothing_o be_v more_o certain_a or_o more_o evident_a than_o this_o that_o in_o a_o live_a animal_n the_o artery_n be_v never_o empty_a quod_fw-la erat_fw-la ostendendum_fw-la from_o the_o praecedent_n theorem_fw-la natural_o arise_v this_o consectary_n that_o after_o the_o pulsation_n of_o the_o heart_n there_o remain_v in_o the_o artery_n the_o 4_o the_o part_n of_o the_o whole_a mass_n of_o blood_n contain_v in_o the_o body_n of_o a_o animal_n and_o in_o a_o man_n common_o about_o 5_o pint_n and_o that_o the_o proportion_n of_o blood_n express_v by_o the_o systole_n of_o the_o heart_n into_o the_o artery_n be_v about_o one_o twenty_o part_n of_o the_o blood_n contain_v in_o they_o as_o also_o that_o 3_o ounce_n of_o blood_n eject_v out_o of_o the_o heart_n into_o the_o artery_n fill_v a_o space_n in_o the_o artery_n next_o to_o the_o heart_n no_o great_a than_o half_a a_o foot_n namely_o so_o much_o as_o be_v triple_a or_o quadruple_a to_o the_o latitude_n of_o the_o ventricles_n of_o the_o heart_n proposition_n that_o the_o motion_n of_o the_o blood_n in_o the_o artery_n be_v threefold_o swift_a than_o the_o motion_n of_o the_o heart_n that_o impell_v the_o blood_n because_o in_o the_o same_o time_n be_v absolve_v all_o these_o motion_n viz._n the_o dilatation_n of_o the_o pore_n of_o the_o heart_n the_o restriction_n of_o its_o cavity_n by_o the_o swell_a inward_a of_o the_o wall_n of_o the_o ventricles_n the_o expulsion_n of_o the_o blood_n contain_v in_o the_o ventricles_n the_o motion_n of_o the_o expulse_v blood_n in_o the_o artery_n and_o the_o promotion_n of_o the_o mass_n of_o blood_n preaexistent_a in_o they_o cause_v by_o the_o urgency_n of_o the_o new_a blood_n come_v on_o out_o of_o the_o heart_n all_o these_o action_n i_o say_v be_v perform_v in_o the_o same_o time_n and_o it_o appear_v that_o the_o three_o former_a operation_n be_v perform_v with_o the_o same_o velocity_n in_o the_o heart_n because_o the_o fibre_n of_o the_o heart_n by_o reason_n of_o their_o abbreviation_n be_v with_o the_o same_o motion_n move_v through_o the_o same_o space_n of_o the_o amplitude_n of_o the_o ventricles_n through_o which_o they_o be_v move_v by_o restr_v the_o same_o ventricles_n and_o squirt_v out_o the_o blood_n that_o be_v contain_v in_o they_o and_o the_o two_o last_o operation_n likewise_o be_v perform_v with_o the_o same_o velocity_n for_o look_v how_o much_o space_n the_o blood_n expel_v out_o of_o the_o heart_n run_v through_o in_o the_o artery_n just_o so_o much_o space_n must_v the_o mass_n of_o blood_n preaexistent_a in_o they_o be_v drive_v through_o in_o the_o same_o time_n because_o one_o part_n of_o the_o blood_n must_v give_v way_n to_o another_o urge_v it_o forward_o as_o fast_o as_o that_o come_v on_o behind_o but_o if_o the_o motion_n of_o the_o constriction_n of_o the_o heart_n be_v compare_v with_o the_o progressive_a motion_n of_o the_o blood_n in_o the_o artery_n then_o doubtless_o they_o will_v not_o be_v find_v to_o be_v of_o equal_a velocity_n because_o the_o former_a motion_n viz._n of_o the_o constriction_n of_o the_o heart_n be_v make_v through_o a_o space_n equal_a to_o the_o latitude_n of_o the_o ventricles_n of_o the_o heart_n which_o at_o most_o exceed_v not_o 3_o inch_n breadth_n but_o the_o space_n through_o which_o the_o 3_o ounce_n of_o blood_n express_v out_o of_o the_o heart_n run_v in_o the_o artery_n be_v equal_a to_o the_o length_n of_o half_a a_o foot_n therefore_o the_o space_n will_v be_v triple_a at_o least_o to_o the_o space_n of_o the_o former_a motion_n and_o yet_o both_o these_o motion_n be_v perform_v in_o the_o same_o time_n ergo_fw-la the_o motion_n of_o the_o blood_n in_o the_o artery_n be_v threefold_o swift_a than_o the_o motion_n of_o the_o heart_n that_o cause_v it_o quod_fw-la erat_fw-la propositum_fw-la i_o add_v this_o remark_n that_o the_o motion_n of_o the_o blood_n in_o the_o artery_n be_v always_o the_o same_o whether_o the_o three_o ounce_n of_o blood_n emit_v into_o they_o out_o of_o the_o heart_n exact_o fill_v the_o space_n dilate_v in_o they_o or_o whether_o any_o portion_n of_o it_o be_v after_o their_o repletion_n expel_v out_o of_o they_o for_o in_o both_o case_n the_o blood_n preaexistent_a in_o the_o artery_n be_v just_a so_o much_o promove_v in_o its_o course_n as_o 3_o ounce_n new_o emit_v take_v up_o of_o space_n which_o run_v through_o more_o of_o length_n than_o half_a a_o foot_n ¶_o ⸪_o here_o i_o can_v fair_o decline_v to_o encounter_v a_o vulgar_a error_n that_o stand_v in_o my_o way_n which_o be_v that_o the_o blood_n be_v expel_v out_o of_o the_o orifice_n of_o the_o artery_n into_o the_o substance_n of_o the_o part_n by_o no_o other_o cause_n but_o the_o constriction_n of_o the_o heart_n to_o refute_v which_o i_o will_v assert_v this_o proposition_n that_o the_o cause_n expel_v the_o blood_n out_o of_o the_o artery_n be_v not_o the_o systole_n of_o the_o heart_n alone_o but_o the_o constrictive_a or_o peristaltic_a motion_n of_o the_o artery_n themselves_o natural_o and_o necessary_o succeed_v their_o expansion_n to_o the_o pulsation_n of_o the_o heart_n two_o effect_n be_v subsequent_a viz._n the_o repletion_n of_o the_o artery_n by_o the_o blood_n emit_v into_o they_o and_o the_o expulsion_n of_o the_o same_o blood_n out_o of_o they_o into_o the_o habit_n of_o the_o part_n now_o certain_o these_o two_o operation_n can_v be_v perform_v together_o or_o at_o the_o same_o time_n because_o the_o former_a be_v do_v by_o dilatation_n and_o the_o other_o by_o constriction_n of_o the_o same_o artery_n which_o two_o contrary_a motion_n can_v be_v coincident_a wherefore_o it_o be_v of_o absolute_a necessity_n that_o the_o repletion_n of_o the_o artery_n be_v precedent_n and_o the_o evacuation_n be_v subsequent_a but_o the_o repletion_n can_v be_v make_v without_o a_o violent_a distension_n of_o the_o transverse_n or_o circular_a fibre_n of_o the_o artery_n and_o we_o all_o know_v that_o all_o the_o fibre_n of_o vessel_n no_o less_o than_o those_o
of_o the_o muscle_n of_o the_o gut_n stomach_n tendon_n membrane_n and_o the_o like_a fibrose_n part_n natural_o resist_v distraction_n and_o have_v a_o power_n of_o contract_v themselves_o after_o extension_n yea_o more_o we_o see_v that_o all_o fibres_fw-fr even_o in_o their_o natural_a posture_n be_v somewhat_o upon_o the_o stretch_n for_o when_o they_o be_v cut_v they_o instant_o shorten_v themselves_o towards_o both_o end_n which_o will_v not_o happen_v if_o they_o have_v be_v constitute_v in_o a_o middle_a state_n betwixt_o laxity_n and_o extension_n as_o a_o bow_n unbend_v be_v quiet_a suffer_v neither_o contraction_n nor_o distraction_n of_o its_o part_n now_o if_o all_o fibre_n even_o in_o their_o natural_a state_n suffer_v some_o degree_n of_o stretch_v certain_o when_o the_o artery_n be_v replenish_v with_o blood_n their_o cavity_n must_v be_v dilate_v and_o in_o the_o dilatation_n of_o their_o cavity_n their_o transverse_n or_o circular_a fibre_n must_v suffer_v much_o more_o stretch_v than_o they_o do_v before_o and_o because_o to_o this_o dilatation_n of_o the_o artery_n a_o constriction_n immediate_o succeed_v which_o be_v not_o possible_a to_o be_v effect_v without_o a_o abbreviation_n of_o the_o circular_a fibres_fw-fr of_o the_o artery_n and_o because_o that_o abbreviation_n or_o contraction_n be_v connatural_a to_o the_o fibre_n themselves_o therefore_o it_o be_v impossible_a that_o the_o artery_n after_o that_o violent_a stretch_v cause_v by_o their_o repletion_n and_o turgency_n shall_v not_o exercise_v by_o natural_a necessity_n that_o mechanic_a power_n they_o have_v of_o contract_v themselves_o by_o virtue_n of_o their_o circular_a fibre_n gird_v they_o inward_a and_o equal_o impossible_a that_o the_o artery_n shall_v so_o contract_v themselves_o without_o expel_v at_o the_o same_o time_n out_o of_o their_o orifice_n the_o blood_n that_o dilate_a they_o whence_o it_o appear_v beyond_o dispute_n that_o the_o spontaneous_a constriction_n of_o the_o distend_v artery_n be_v the_o cause_n of_o the_o expulsion_n of_o the_o blood_n out_o of_o they_o into_o the_o substance_n of_o the_o part_n contrary_a to_o their_o opinion_n who_o ascribe_v this_o expulsion_n only_o to_o the_o systole_n of_o the_o heart_n ¶_o ⸪_o the_o natural_a method_n of_o acquire_a science_n you_o know_v be_v to_o begin_v from_o thing_n more_o know_v and_o then_o to_o advance_v to_o thing_n less_o know_v to_o proceed_v from_o effect_n to_o their_o cause_n see_v therefore_o that_o we_o be_v now_o certain_a that_o the_o blood_n in_o animal_n be_v carry_v by_o a_o perpetual_a circular_a motion_n through_o all_o part_n of_o the_o body_n our_o next_o business_n be_v to_o inquire_v what_o be_v the_o cause_n of_o this_o admirable_a motion_n as_o well_o the_o final_a as_o the_o efficient_a i_o begin_v from_o the_o final_a it_o be_v a_o question_n worthy_a our_o consideration_n why_o or_o to_o what_o end_n nature_n all_o who_o counsel_n and_o action_n be_v ordain_v by_o a_o infinite_a wisdom_n have_v institute_v this_o rapid_a circulation_n of_o the_o blood_n constant_a it_o be_v even_o from_o common_a experience_n that_o whenever_o the_o blood_n be_v quiet_a or_o cease_v from_o motion_n whether_o within_o or_o without_o the_o body_n of_o a_o animal_n the_o red_a and_o grumose_n part_v of_o it_o soon_o curdle_n and_o be_v separate_v from_o the_o serose_n or_o albumen_n and_o so_o the_o constitution_n or_o contexture_n of_o it_o be_v dissolve_v and_o corrupt_v whereas_o on_o the_o contrary_a while_o the_o blood_n continue_v in_o perpetual_a motion_n within_o its_o vessel_n in_o the_o body_n of_o a_o live_a animal_n so_o long_o the_o ordinate_a mixture_n of_o its_o element_n due_a temper_n and_o vital_a constitution_n of_o it_o be_v conserve_v for_o mechanical_a reason_n in_o our_o ensue_a discourse_n to_o be_v explain_v it_o seem_v then_o that_o such_o a_o mixture_n of_o the_o constituent_a part_n of_o the_o blood_n upon_o which_o the_o vitality_n of_o it_o do_v necessary_o depend_v can_v be_v otherwise_o conserve_v than_o by_o a_o continual_a agitation_n and_o concussion_n make_v in_o the_o vessel_n first_o by_o the_o heart_n with_o strong_a force_n impel_v the_o blood_n through_o the_o artery_n then_o that_o impulsive_a force_n languish_v by_o filtration_n in_o the_o space_n intermediate_v betwixt_o the_o artery_n and_o vein_n next_o in_o the_o vein_n by_o the_o constriction_n of_o their_o circular_a fibre_n by_o the_o compression_n of_o the_o muscle_n and_o the_o viscera_n and_o the_o inspire_a air_n all_o which_o compression_n will_v not_o suffice_v be_v not_o valve_n place_v commodious_o within_o the_o vein_n by_o which_o the_o motion_n of_o the_o blood_n be_v accelerate_a and_o a_o far_a conquassation_n of_o it_o make_v and_o here_o we_o meet_v with_o a_o fair_a occasion_n to_o reflect_v upon_o the_o mutual_a anastomôse_n of_o the_o capillary_a vein_n and_o the_o infrequent_a distribution_n of_o valve_n in_o one_o and_o the_o same_o vein_n for_o both_o these_o contribute_v also_o their_o proportion_n towards_o the_o end_n now_o under_o our_o disquisition_n for_o the_o texture_n of_o the_o vein_n be_v indeed_o lax_n and_o soft_a yet_o such_o as_o may_v by_o virtue_n of_o their_o circular_a fibre_n be_v constringe_v and_o contract_v hence_o it_o be_v that_o by_o the_o blood_n regurgitate_v in_o those_o tract_n of_o the_o vein_n that_o have_v no_o valve_n by_o the_o great_a quantity_n and_o force_n of_o its_o regurgitation_n or_o recoil_n the_o low_a part_n of_o the_o vein_n be_v much_o dilate_v and_o on_o the_o contrary_a the_o high_a part_n be_v contract_v so_o that_o the_o blood_n be_v by_o this_o reflux_n though_o inobservable_a agitate_a and_o conquassated_a may_v revive_v its_o due_a commistion_n and_o conserve_v its_o vital_a constitution_n it_o appear_v then_o the_o defect_n of_o valve_n also_o have_v its_o use_n within_o the_o cavity_n of_o the_o artery_n as_o i_o say_v before_o no_o valve_n be_v place_v because_o the_o grand_a force_n by_o which_o the_o blood_n be_v impel_v through_o they_o be_v more_o than_o sufficient_a to_o conquassate_fw-it and_o commix_v it_o by_o wedge_v in_o as_o it_o be_v the_o more_o fluid_a albugineous_a particle_n among_o the_o red_a grumose_n particle_n that_o from_o both_o sort_n commix_v per_fw-la minimas_fw-la moleculas_fw-la as_o they_o say_v and_o yet_o mutual_o reluctant_a the_o vital_a mication_n or_o oscillatory_n intestine_a motion_n of_o the_o blood_n may_v be_v continue_v so_o then_o here_o be_v neither_o need_n of_o nor_o place_n for_o a_o fermentation_n now_o from_o the_o consideration_n of_o these_o thing_n premise_v i_o conclude_v that_o the_o circulation_n of_o the_o blood_n be_v institute_v for_o the_o conservation_n of_o its_o requisite_a temper_n and_o vital_a constitution_n which_o be_v to_o be_v inquire_v and_o which_o lead_v we_o to_o the_o admirable_a effect_n and_o benefit_n arise_v to_o the_o animal_n oeconomy_n from_o the_o same_o velocity_n of_o the_o circulation_n of_o the_o blood_n which_o be_v certain_o so_o great_a that_o the_o whole_a mass_n of_o blood_n run_v its_o circular_a race_n in_o the_o twenty_o part_n of_o a_o hour_n or_o thereabouts_o even_o in_o a_o sedentary_a and_o sedate_v man_n as_o have_v by_o many_o be_v demonstrate_v from_o the_o quantity_n of_o blood_n common_o contain_v in_o the_o body_n from_o the_o number_n of_o pulse_n make_v in_o a_o hour_n and_o from_o the_o quantity_n of_o blood_n express_v by_o every_o pulse_n of_o the_o heart_n and_o we_o have_v already_o see_v what_o advantage_n redound_v to_o the_o blood_n itself_o from_o this_o velocity_n our_o curiosity_n spur_v we_o on_o to_o inquire_v also_o what_o other_o scope_n or_o end_n nature_n may_v probable_o be_v conceive_v to_o have_v propose_v to_o herself_o when_o she_o institute_v this_o so_o rapid_a motion_n or_o what_o emolument_n and_o benefit_n from_o thence_o redound_v to_o the_o oeconomy_n of_o the_o whole_a body_n of_o these_o the_o first_o seem_v to_o be_v this_o that_o in_o every_o pulsation_n of_o the_o heart_n a_o great_a quantity_n of_o blood_n be_v effuse_v and_o protrude_v out_o of_o the_o capillary_a artery_n into_o the_o habit_n of_o the_o part_n for_o their_o refocillation_n by_o influent_a life_n of_o which_o i_o have_v former_o discourse_v copiose_o in_o this_o place_n for_o by_o how_o much_o swift_a the_o motion_n of_o any_o liquor_n or_o other_o fluid_a through_o a_o pipe_n or_o canal_n be_v so_o much_o a_o great_a quantity_n of_o it_o be_v in_o equal_a time_n effuse_v at_o the_o orifice_n thereof_o as_o have_v be_v ingenious_o demonstrate_v by_o b._n castellus_n fluxu_fw-la and_o therefore_o the_o blood_n be_v like_o a_o full_a and_o rapid_a torrent_n impel_v into_o the_o pore_n of_o the_o flesh_n and_o viscera_n the_o second_o be_v the_o energy_n of_o the_o stroke_n with_o which_o the_o blood_n project_v by_o the_o heart_n dash_v against_o the_o same_o extreme_a part_n which_o energy_n be_v
compose_v of_o the_o degree_n of_o velocity_n and_o of_o the_o quantity_n of_o blood_n impulse_v 28._o as_o that_o excellent_a mathematician_n io._n alphonsus_n borellus_n have_v full_o demonstrate_v by_o this_o stroke_n it_o be_v that_o the_o new_o empty_v and_o connive_a porosity_n of_o the_o muscle_n and_o viscera_n be_v force_v open_a and_o replenish_v with_o the_o impulsed_a blood_n that_o communicate_v to_o they_o vital_a heat_n and_o fresh_a vigour_n and_o that_o the_o torpid_a useless_a and_o excrementitious_a particle_n there_o remain_v be_v protrude_v and_o expel_v partly_o through_o the_o pore_n of_o the_o skin_n partly_o through_o vessel_n destine_v to_o their_o transportation_n and_o expulsion_n so_o that_o by_o this_o rapid_a rush_v in_o of_o the_o blood_n nature_n attain_v to_o not_o only_o a_o revive_n of_o the_o solid_a part_n of_o the_o body_n but_o also_o to_o the_o expurgation_n of_o the_o blood_n itself_o from_o its_o unprofitable_a and_o excrementitious_a part_n in_o the_o emunctory_n ordain_v for_o that_o office_n a_o three_o advantage_n be_v that_o by_o the_o same_o rapid_a velocity_n of_o the_o blood_n and_o its_o vehement_a intrusion_n into_o the_o narrow_a meatus_fw-la of_o the_o part_n the_o current_n thereof_o dislodge_v rinse_v away_o and_o carry_v with_o it_o many_o other_o amoveable_a particle_n of_o various_a kind_n saline_n sulphureous_a etc._n etc._n principal_o the_o relic_n of_o the_o nutritive_a and_o nervose_a juice_n bring_v thither_o from_o the_o brain_n which_o though_o unprofitable_a now_o to_o the_o refection_n and_o invigoration_n of_o the_o part_n in_o which_o they_o be_v leave_v may_v yet_o be_v of_o some_o use_n to_o recruit_v and_o conserve_v the_o crasis_n of_o the_o blood_n and_o to_o expedite_v the_o secretion_n of_o its_o excrement_n this_o artifice_n of_o nature_n we_o may_v more_o easy_o comprehend_v by_o observe_v that_o the_o foreign_a particle_n now_o mention_v be_v extricate_v and_o rinse_v away_o by_o the_o blood_n not_o in_o ample_a vessel_n but_o after_o the_o egress_n of_o the_o blood_n out_o of_o the_o capillary_a artery_n in_o the_o intermediate_v space_n betwixt_o they_o and_o the_o capillary_a vein_n where_o end_n innumerable_a small_a canales_n some_o of_o which_o bring_v in_o the_o nutritive_a and_o nervose_a liquor_n other_o export_v the_o superfluous_a and_o less_o profitable_a particle_n of_o they_o which_o small_a pipe_n be_v like_o the_o capillary_a root_n of_o plant_n almost_o every_o where_o disseminated_a into_o the_o fleshy_a part_n into_o the_o viscera_n and_o most_o frequent_o into_o the_o glandule_n and_o this_o seem_v to_o be_v do_v to_o the_o end_n that_o so_o many_o particle_n of_o these_o spiritual_a and_o noble_a juice_n be_v rinse_v away_o by_o and_o commix_v with_o the_o the_o blood_n may_v advance_v and_o conserve_v the_o due_a consistence_n and_o constitution_n of_o it_o now_o of_o these_o three_o considerable_a benefit_n no_o one_o seem_v to_o i_o possible_a to_o be_v attain_v otherwise_o than_o by_o the_o perpetual_a and_o rapid_a motion_n of_o the_o blood_n wherefore_o i_o be_o not_o destitute_a of_o a_o rational_a ground_n to_o support_v my_o conjecture_n that_o for_o these_o end_n nature_n think_v fit_a to_o institute_v the_o swift_a motion_n of_o the_o blood_n in_o its_o circulation_n ¶_o ⸪_o but_o what_o may_v we_o conceive_v to_o be_v the_o reason_n that_o induce_v she_o to_o institute_v also_o so_o multiply_v a_o repetition_n of_o this_o course_n of_o the_o blood_n through_o the_o same_o way_n a_o river_n we_o know_v though_o the_o water_n be_v in_o a_o continual_a flux_n be_v yet_o still_o the_o same_o river_n because_o the_o elapsed_a part_n be_v continual_o succeed_v by_o new_a water_n come_v on_o with_o the_o same_o degree_n of_o speed_n to_o supply_v it_o but_o to_o maintain_v this_o perpetual_a succession_n and_o supply_n upon_o which_o the_o identity_n of_o the_o river_n necessary_o depend_v there_o be_v require_v either_o a_o immense_a quantity_n of_o water_n from_o a_o spring_n to_o feed_v the_o current_n or_o the_o same_o elapsed_a water_n must_v be_v bring_v back_o again_o to_o the_o fountain_n whence_o it_o flow_v that_o so_o by_o perpetual_o reiterated_a circuition_n the_o course_n of_o the_o river_n may_v be_v conserve_v which_o otherwise_o will_v soon_o fail_v and_o cease_v we_o be_v then_o no_o long_o to_o admire_v that_o nature_n have_v design_v to_o bring_v the_o river_n of_o blood_n with_o a_o most_o rapid_a course_n through_o the_o whole_a body_n of_o a_o animal_n for_o the_o various_a end_n above_o explain_v and_o resolve_v to_o make_v that_o course_n perpetual_a during_o the_o life_n of_o the_o animal_n make_v use_v of_o the_o same_o expedient_a viz._n to_o repete_fw-la the_o circuition_n of_o the_o same_o blood_n without_o intermission_n for_o the_o whole_a mass_n of_o blood_n common_o find_v in_o the_o body_n of_o a_o man_n not_o exceed_v 20_o pint_n and_o that_o quantity_n not_o suffice_v to_o maintain_v the_o course_n above_o 5_o or_o 6_o first_o minute_n of_o a_o hour_n lest_o the_o current_n may_v cease_v and_o so_o life_n also_o fail_v it_o be_v necessary_a that_o the_o circulation_n of_o the_o same_o mass_n of_o blood_n shall_v be_v continual_o reiterated_a for_o the_o conservation_n of_o life_n beside_o this_o necessity_n there_o be_v many_o admirable_a use_n and_o advantage_n which_o nature_n bring_v to_o a_o animal_n by_o often_o repeat_v the_o period_n of_o the_o circuition_n of_o the_o blood_n through_o the_o same_o way_n for_o if_o the_o circulation_n be_v not_o in_o this_o manner_n reiterated_a the_o blood_n can_v not_o be_v defaecate_v from_o its_o biliose_fw-la excrement_n in_o the_o liver_n nor_o according_a to_o the_o vulgar_a opinion_n from_o the_o matter_n of_o urine_n in_o the_o kidney_n nor_o can_v either_o the_o chyle_n be_v commix_v with_o the_o blood_n in_o the_o heart_n or_o the_o lympha_fw-la be_v bring_v to_o temper_n and_o dilute_v it_o in_o the_o vein_n nor_o can_v various_a other_o operation_n necessary_a to_o the_o animal_n oeconomy_n be_v perform_v all_o which_o it_o be_v not_o difficult_a for_o i_o to_o deduce_v from_o this_o repeted_a circuition_n of_o the_o blood_n if_o the_o shortness_n of_o the_o time_n appoint_v to_o i_o for_o the_o administration_n of_o my_o present_a province_n do_v not_o oblige_v i_o to_o pass_v by_o all_o collateral_a disquisition_n and_o to_o peruse_v my_o principal_a theme_n the_o motion_n of_o the_o blood_n from_o the_o final_a cause_n of_o which_o i_o will_v therefore_o in_o a_o direct_a order_n proceed_v to_o the_o efficient_a ¶_o ⸪_o praelectio_fw-la ii_o of_o the_o heart_n and_o its_o pulsation_n to_o measure_v the_o divine_a wisdom_n elucent_fw-la in_o every_o organ_n of_o a_o animal_n by_o the_o short_a line_n of_o human_a reason_n be_v indeed_o extreme_a folly_n and_o yet_o i_o doubt_v not_o to_o applaud_v and_o follow_v the_o counsel_n of_o erasistratus_n who_o as_o galen_n relate_v advise_v physician_n to_o solve_v all_o the_o action_n natural_o do_v in_o the_o body_n of_o a_o animal_n by_o mechanic_n principle_n so_o far_o at_o least_o as_o the_o dim_a light_n of_o my_o limit_a understanding_n may_v serve_v to_o guide_v i_o in_o my_o researche_n for_o not_o to_o depend_v upon_o the_o authority_n of_o plato_n who_o say_v 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d that_o god_n always_o work_v by_o geometry_n or_o of_o his_o great_a disciple_n aristotle_n who_o from_o thence_o call_v god_n 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d the_o mechanic_n of_o the_o world_n we_o have_v the_o great_a authority_n of_o the_o sacred_a scripture_n itself_o that_o god_n have_v frame_v all_o thing_n in_o number_n weight_n and_o measure_n whoever_o therefore_o intend_v with_o due_a care_n to_o study_v any_o part_n of_o his_o work_n must_v therein_o chief_o consider_v number_n weight_n and_o measure_n i._n e._n the_o mechanism_n of_o it_o otherwise_o in_o the_o end_n he_o will_v find_v his_o mind_n rather_o swell_v with_o opinion_n than_o fill_v with_o knowledge_n why_o then_o may_v not_o we_o who_o be_v christian_n as_o well_o as_o natural_a philosopher_n take_v those_o part_n of_o a_o animal_n to_o be_v machine_n or_o engine_n which_o evident_a reason_n and_o chief_o sense_n show_v to_o be_v such_o or_o who_o have_v prohibit_v we_o to_o investigate_v the_o formal_a reason_n and_o manner_n of_o their_o operation_n it_o be_v not_o more_o certain_a that_o no_o mortal_a can_v know_v enough_o of_o god_n work_n than_o it_o be_v that_o the_o more_o we_o be_v able_a to_o discover_v of_o his_o wisdom_n power_n and_o goodness_n discernible_a in_o the_o mirror_n of_o his_o creature_n the_o more_o we_o shall_v find_v ourselves_o oblige_v to_o admire_v love_n and_o adore_v he_o equal_o certain_a it_o be_v also_o that_o no_o kind_n of_o devotion_n be_v more_o acceptable_a to_o he_o than_o that_o which_o proceed_v from_o knowledge_n of_o his_o infinite_a
congruous_a to_o the_o organical_a structure_n of_o the_o heart_n to_o all_o which_o i_o have_v be_v careful_a to_o adjust_a they_o and_o in_o fine_a consistent_a among_o themselves_o then_o i_o shall_v with_o assurance_n conclude_v that_o the_o heart_n be_v as_o all_o automata_n be_v move_v by_o mechanic_n necessity_n which_o be_v what_o i_o propose_v to_o demonstrate_v even_o without_o that_o incredible_a displosion_n of_o saline_n and_o acid_n spirit_n in_o the_o heart_n first_o imagine_v by_o doctor_n willis_n and_o since_o assert_v by_o a_o man_n of_o much_o great_a erudition_n and_o more_o solid_a judgement_n namely_o alphonsus_n borellus_n as_o necessary_a to_o be_v suppose_v in_o order_n to_o the_o solution_n of_o this_o great_a problem_n of_o the_o pulsation_n of_o the_o heart_n and_o that_o of_o the_o motion_n of_o the_o rest_n of_o the_o muscle_n which_o pretty_a conceit_n i_o will_v first_o revive_v in_o your_o memory_n by_o recite_v a_o few_o of_o borellus_n own_o word_n faithful_o and_o then_o offer_v to_o your_o consideration_n the_o reason_n that_o have_v induce_v i_o to_o reject_v it_o restat_fw-la igitur_fw-la say_v he_o quòd_fw-la sicut_fw-la omnes_fw-la musculi_fw-la contrahuntur_fw-la inflatis_fw-la vesiculis_fw-la eorum_fw-la pororum_fw-la sic_fw-la quoque_fw-la immediata_fw-la causa_fw-la tensionis_fw-la cordis_n erit_fw-la inflatio_fw-la vesicularum_fw-la pororum_fw-la ejus_fw-la facta_fw-la à _fw-la fermentativa_fw-la ebullitione_fw-la tartarearum_fw-la partium_fw-la sanguinis_fw-la à _fw-la succo_n spirituoso_fw-la ex_fw-la orificiis_fw-la nervorum_fw-la instillato_fw-la etc._n etc._n the_o reason_n that_o dissuade_v i_o from_o assent_v to_o so_o great_a a_o man_n in_o this_o matter_n be_v these_o first_o we_o have_v the_o testimony_n even_o of_o our_o sight_n the_o most_o certain_a of_o all_o our_o sense_n that_o in_o a_o egg_n after_o a_o day_n or_o two_o incubation_n of_o the_o hen_n the_o punctum_fw-la saliens_fw-la first_fw-mi and_o then_o the_o vesicula_fw-la pulsans_fw-la be_v agitate_a by_o a_o manifest_a pulsation_n in_o the_o centre_n of_o the_o colliquamentum_fw-la or_o genital_a humour_n which_o be_v a_o pure_a and_o homogeneous_a liquor_n even_o before_o any_o the_o least_o sign_n of_o blood_n can_v be_v discern_v here_o therefore_o the_o suppose_a immediate_a cause_n of_o the_o heart_n motion_n viz._n a_o inflation_n from_o a_o fermentative_a ebullition_n of_o the_o tartarous_a part_n of_o the_o blood_n meeting_n and_o conflict_v with_o the_o spirituose_fw-la juice_n instill_a out_o of_o the_o nerve_n into_o the_o heart_n certain_o can_v have_v no_o place_n for_o at_o that_o time_n in_o the_o egg_n neither_o heart_n nor_o brain_n nor_o nerve_n be_v yet_o form_v nor_o be_v any_o part_n of_o the_o colliquamentum_fw-la convert_v into_o blood_n &_o causarum_fw-la in_o rerum_fw-la natura_fw-la nondum_fw-la existentium_fw-la nulli_fw-la dantur_fw-la effectus_fw-la beside_o the_o same_o vesicula_fw-la pulsans_fw-la be_v from_o the_o begin_n of_o the_o change_n of_o the_o genital_a liquor_n into_o blood_n not_o only_o the_o conceptacle_n of_o it_o but_o also_o the_o engine_n that_o give_v it_o motion_n and_o therefore_o the_o new_a make_v blood_n can_v contribute_v nothing_o towards_o the_o pulsation_n thereof_o second_o if_o not_o only_o the_o natural_a motion_n of_o the_o heart_n but_o also_o the_o voluntary_a motion_n of_o the_o rest_n of_o the_o muscle_n proceed_v from_o a_o explosion_n of_o mutual_o hostile_a spirit_n concur_v and_o combat_v in_o they_o as_o borellus_n affirm_v why_o have_v not_o all_o other_o muscle_n as_o well_o as_o the_o heart_n a_o perpetual_a pulsation_n in_o they_o when_o the_o same_o blood_n and_o the_o same_o succus_fw-la spirituosus_fw-la perpetual_o concur_v in_o they_o no_o less_o than_o in_o the_o heart_n and_o what_o dominion_n can_v the_o soul_n have_v over_o the_o muscle_n of_o the_o limb_n to_o exercise_v which_o of_o they_o she_o please_v and_o as_o long_o as_o she_o please_v and_o give_v they_o rest_v when_o she_o please_v if_o they_o be_v agitate_a every_o moment_n by_o squibbs_n or_o cracker_n break_v within_o they_o certain_o she_o can_v never_o moderate_v such_o violent_a and_o tumultuous_fw-la explosion_n beside_o it_o be_v wonderful_a strange_a if_o those_o explosion_n be_v make_v in_o a_o muscle_n when_o it_o act_n that_o we_o shall_v never_o perceive_v it_o to_o be_v distend_v or_o heave_v up_o outward_o but_o that_o on_o the_o contrary_a we_o shall_v plain_o perceive_v the_o muscle_n in_o all_o voluntary_a motion_n to_o be_v strong_o constringe_v inward_o to_o be_v minorate_v and_o become_v hard_a which_o be_v a_o certain_a indicium_fw-la that_o they_o be_v move_v in_o a_o manner_n quite_o contrary_a to_o inflation_n three_o such_o a_o explosion_n make_v in_o the_o heart_n may_v indeed_o cause_v the_o diastole_n of_o it_o by_o inflate_v and_o distend_v the_o ventricles_n but_o will_v hinder_v the_o systole_n or_o 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