which_o we_o find_v in_o the_o body_n of_o the_o heart_n on_o its_o right_a side_n this_o cavity_n be_v call_v the_o right_a ventricle_n of_o the_o heart_n as_o soon_o as_o the_o ventricle_n be_v full_a of_o blood_n it_o contract_v its_o self_n and_o empty_v its_o self_n by_o this_o contraction_n it_o be_v here_o to_o be_v remark_v that_o at_o the_o open_n of_o the_o right_a auricle_n into_o the_o right_a ventricle_n of_o the_o heart_n there_o be_v certain_a small_a skin_n which_o they_o call_v valve_n they_o be_v three_o in_o number_n almost_o of_o a_o triangular_a figure_n who_o side_n be_v notch_v their_o base_n adhere_v to_o the_o open_n of_o the_o auricle_n and_o their_o point_n be_v place_v within_o the_o ventricle_n their_o point_n be_v uphold_v only_o by_o small_a tendinous_a fibres_n strong_a and_o of_o a_o good_a length_n which_o without_o be_v stretch_v be_v strong_o fasten_v to_o small_a carneous_a pillar_n place_v upon_o the_o concave_a surface_n of_o the_o ventricle_n this_o disposition_n show_v to_o the_o eye_n that_o these_o valve_n be_v so_o many_o small_a door_n which_o the_o blood_n open_v of_o its_o self_n when_o it_o run_v from_o the_o auricle_n into_o the_o ventricle_n and_o which_o it_o shut_v after_o it_o be_v enter_v there_o indeed_o as_o soon_o as_o the_o ventricle_n be_v full_a of_o blood_n it_o contract_v its_o self_n and_o the_o blood_n be_v press_v equal_o on_o all_o side_n by_o this_o contraction_n for_o this_o cause_n it_o get_v under_o these_o valve_n lift_v up_o their_o point_n towards_o the_o open_n of_o the_o auricle_n which_o be_v thereby_o so_o exact_o shut_v that_o no_o drop_n of_o blood_n can_v pass_v that_o way_n so_o the_o blood_n shut_v up_o to_o its_o self_n this_o passage_n and_o can_v get_v out_o the_o way_n by_o which_o it_o have_v enter_v nevertheless_o it_o do_v not_o stay_v in_o the_o right_a ventricle_n of_o the_o heart_n it_o go_v out_o by_o another_o door_n to_o which_o the_o beginning_n of_o a_o artery_n be_v strong_o fasten_v this_o artery_n be_v divide_v into_o many_o branch_n which_o distribute_v themselves_o into_o the_o lobe_n of_o the_o lung_n at_o its_o pass_v from_o the_o right_a ventricle_n it_o have_v in_o its_o cavity_n three_o valve_n make_v like_o crescent_n and_o rank_v each_o at_o the_o side_n of_o the_o other_o their_o convexity_n adhere_v to_o the_o artery_n and_o turn_n towards_o the_o ventricle_n and_o their_o concavity_n be_v disengage_v and_o turn_v towards_o the_o artery_n this_o situation_n show_v we_o that_o they_o do_v not_o oppose_v the_o motion_n of_o the_o blood_n when_o it_o come_v from_o the_o ventricle_n to_o the_o artery_n but_o by_o rise_v up_o they_o stop_v its_o course_n if_o it_o press_v from_o the_o artery_n into_o the_o ventricle_n after_o that_o the_o blood_n have_v pass_v from_o the_o right_a ventricle_n into_o the_o lung_n by_o the_o pulmonary_a artery_n it_o return_v from_o they_o by_o a_o vein_n which_o be_v call_v the_o pulmonary_a vein_n this_o pulmonary_a vein_n discharge_v its_o self_n into_o a_o little_a bag_n fasten_v to_o the_o left_a side_n of_o the_o heart_n which_o be_v call_v the_o left_a auricle_n as_o soon_o as_o this_o auricle_n be_v full_a it_o contract_v its_o self_n thrust_v by_o its_o contraction_n the_o blood_n into_o a_o cavity_n in_o the_o substance_n of_o the_o heart_n place_v on_o its_o left_a side_n which_o be_v call_v the_o left_a ventricle_n as_o soon_o as_o this_o cavity_n be_v full_a of_o blood_n it_o contract_v its_o self_n and_o by_o this_o contraction_n throw_v out_o all_o the_o blood_n which_o it_o contain_v that_o we_o may_v learn_v where_o the_o blood_n go_v when_o it_o pass_v from_o the_o left_a ventricle_n of_o the_o heart_n we_o be_v to_o take_v notice_n that_o at_o the_o open_n of_o the_o left_a auricle_n there_o be_v valve_n situate_v after_o the_o same_o manner_n as_o at_o the_o open_n of_o the_o right_a ventricle_n their_o use_n also_o be_v the_o same_o they_o permit_v indeed_o the_o blood_n to_o run_v from_o the_o auricle_n into_o the_o ventricle_n but_o they_o hinder_v it_o from_o come_v out_o of_o the_o ventricle_n into_o the_o auricle_n when_o the_o heart_n contract_v its_o self_n the_o blood_n therefore_o take_v another_o way_n indeed_o it_o get_v out_o of_o the_o left_a ventricle_n by_o another_o passage_n which_o make_v the_o beginning_n of_o the_o great_a artery_n which_o they_o call_v the_o aorta_fw-mi we_o find_v in_o the_o cavity_n of_o this_o artery_n next_o to_o the_o heart_n three_o valve_n make_v crescent_a way_n dispose_v after_o the_o same_o manner_n as_o those_o of_o the_o pulmonary_a artery_n they_o permit_v the_o blood_n to_o get_v out_o of_o the_o left_a ventricle_n and_o to_o run_v into_o the_o aorta_n but_o they_o hinder_v the_o blood_n from_o flow_v back_o from_o the_o aorta_fw-la into_o the_o left_a ventricle_n there_o be_v yet_o a_o important_a remark_n to_o be_v make_v upon_o the_o motion_n of_o the_o auricles_n and_o ventricles_n of_o the_o heart_n it_o be_v that_o the_o two_o auricles_n do_v contract_n and_o dilate_v themselves_o at_o the_o same_o time_n and_o the_o two_o ventricles_n in_o like_a manner_n with_o this_o circumstance_n that_o at_o the_o time_n the_o auricles_n contract_v themselves_o the_o ventricles_n be_v dilate_v and_o when_o the_o ventricles_n contract_v themselves_o the_o auricles_n be_v dilate_v in_o course_n which_o make_v we_o conjecture_v that_o the_o heart_n be_v a_o muscle_n who_o auricles_n may_v well_o be_v repute_v the_o antagonist_n muscle_n before_o we_o inquire_v if_o this_o conjecture_n be_v a_o truth_n it_o will_v not_o be_v impertinent_a to_o observe_v that_o since_o the_o auricles_n contract_v themselves_o at_o the_o same_o time_n they_o do_v also_o at_o the_o same_o time_n shed_v the_o blood_n into_o the_o ventricles_n of_o the_o heart_n by_o the_o same_o reason_n the_o ventricles_n of_o the_o heart_n do_v at_o one_o time_n press_v the_o blood_n into_o the_o pulmonary_a artery_n and_o into_o the_o aorta_fw-la when_o we_o consider_v the_o heart_n narrow_o we_o perceive_v that_o it_o be_v compose_v of_o carneous_a fibres_n which_o have_v all_o of_o they_o communication_n with_o a_o membrane_n make_v of_o tendinous_a fibres_n this_o membrane_n be_v place_v at_o the_o base_a of_o the_o heart_n and_o keep_v the_o auricles_n fix_v to_o it_o which_o make_v we_o judge_v that_o the_o heart_n be_v a_o muscle_n in_o the_o heart_n we_o observe_v three_o order_n of_o fibres_n the_o first_o be_v of_o those_o which_o go_v in_o a_o straight_a line_n from_o the_o basis_n of_o the_o heart_n just_a to_o its_o point_n and_o they_o lie_v in_o a_o small_a number_n over_o the_o right_a ventricle_n the_o second_o be_v of_o those_o which_o go_v from_o the_o base_a and_o after_o they_o have_v extend_v themselves_o to_o the_o middle_n of_o the_o heart_n ascend_v again_o and_o return_v to_o the_o base_a from_o whence_o they_o come_v the_o three_o be_v of_o those_o which_o go_v from_o the_o base_a and_o come_v to_o the_o point_n describe_v about_o the_o heart_n a_o spiral_n line_n there_o they_o re-enter_v within_o the_o heart_n and_o re-ascend_a spiral_o towards_o the_o base_a some_o of_o they_o end_n in_o the_o ventricles_n where_o they_o make_v a_o texture_n of_o their_o tendinous_a fibre_n which_o cover_v they_o on_o all_o side_n some_o of_o those_o also_o which_o come_v into_o the_o ventricles_n make_v those_o little_a eminency_n which_o be_v call_v pillar_n from_o the_o point_n of_o these_o pillar_n go_v many_o tendinous_a string_n which_o be_v join_v to_o the_o tooth_n of_o the_o valve_n that_o be_v place_v in_o the_o open_n of_o the_o auricles_n all_o these_o order_n of_o fibres_n do_v serve_v by_o the_o shorten_n of_o themselves_o to_o contract_v the_o ventricles_n of_o the_o heart_n the_o straight_a fibres_n shorten_v it_o the_o circular_a one_o straiten_v it_o and_o the_o spiral_n wring_v it_o the_o heart_n can_v be_v thus_o shorten_v straighten_a and_o wreathe_a but_o the_o ventricles_n must_v needs_o be_v contract_v from_o whence_o we_o must_v conclude_v that_o the_o heart_n be_v a_o muscle_n who_o action_n consist_v in_o straighten_v the_o cavity_n which_o be_v among_o its_o fibre_n as_o for_o the_o auricles_n they_o be_v also_o compose_v of_o carneous_a fibres_n of_o which_o some_o of_o they_o be_v interweave_v with_o other_o they_o be_v extend_v for_o the_o most_o part_n to_o the_o length_n and_o those_o of_o they_o which_o be_v interweave_v seem_v to_o cross_v they_o to_o become_v circular_a the_o shorten_n of_o the_o first_o do_v diminish_v the_o length_n of_o the_o auricles_n and_o the_o shorten_n of_o the_o other_o diminish_v their_o breadth_n which_o show_v we_o that_o the_o auricles_n be_v nothing_o but_o cavernous_a muscle_n who_o action_n consist_v in_o the_o contraction_n of_o their_o cavity_n
lacteal_v vein_n these_o excrement_n do_v afterward_o pass_v into_o the_o ilium_n where_o in_o divers_a place_n they_o receive_v again_o of_o the_o glandulous_a juice_n which_o do_v produce_v the_o same_o effect_n as_o former_o in_o fine_a after_o they_o be_v entire_o free_v of_o their_o chylous_a part_n they_o pass_v into_o the_o great_a intestine_n they_o be_v then_o compose_v of_o part_n which_o the_o ferment_n of_o the_o stomach_n can_v not_o dissolve_v and_o of_o salt_n which_o be_v form_v by_o the_o union_n of_o alcaly_n of_o the_o bile_n of_o the_o pancreatic_a juice_n and_o of_o the_o glandulous_a juice_n with_o the_o acid_n which_o be_v engage_v among_o the_o part_n of_o the_o chyle_n the_o fourteen_o discourse_n of_o the_o mesentery_n the_o lacteal_v vein_n pecquets_n reservatory_n and_o the_o thoracick_a conduit_n the_o intestine_n adhere_v to_o the_o circumference_n of_o a_o membranous_a ruff_n which_o they_o call_v the_o mesentery_n the_o middle_n of_o it_o be_v so_o strong_o fasten_v to_o the_o vertebrae_n of_o the_o loin_n that_o it_o can_v be_v separate_v from_o they_o unless_o you_o tear_v a_o part_n of_o it_o or_o cut_v it_o it_o be_v compose_v of_o two_o membrane_n of_o which_o the_o upper_a be_v a_o continuation_n of_o the_o peritonaeum_fw-la and_o the_o inferior_a a_o texture_n of_o tendinous_a fibre_n which_o come_v from_o the_o vertebrae_n of_o the_o loin_n the_o mesenterick_n artery_n spread_v many_o branch_n among_o the_o membrane_n of_o the_o mesentery_n one_o part_n of_o which_o go_v to_o the_o intestine_n and_o the_o other_o be_v spread_v among_o the_o fibre_n of_o the_o membrane_n which_o compose_v it_o the_o vein_n which_o come_v from_o the_o intestine_n be_v likewise_o spread_v between_o the_o membrane_n of_o the_o mesentery_n and_o many_o small_a vein_n which_o come_v from_o among_o their_o fibre_n go_v thither_o they_o be_v call_v the_o mesaraick_n vein_n they_o go_v to_o the_o vena_fw-la porta_n many_o nerve_n which_o arise_v from_o the_o vertebrae_n of_o the_o loin_n and_o from_o the_o intercostal_n be_v so_o interweave_v one_o with_o another_o upon_o the_o mesentery_n that_o they_o form_n a_o plexus_fw-la which_o be_v call_v the_o mesenterick_n plexus_fw-la many_o nervous_a fibres_n go_v from_o it_o which_o be_v spread_v among_o the_o fibre_n of_o the_o membrane_n of_o the_o mesentery_n and_o a_o part_n of_o which_o pass_v even_o to_o the_o intestine_n the_o middle_n between_o the_o membrane_n of_o the_o mesentery_n be_v replenish_v with_o far._n it_o appear_v chief_o about_o the_o mesaraick_n vein_n in_o the_o midst_n of_o it_o we_o find_v a_o large_a glandule_n and_o sometime_o two_o three_o or_o four_o in_o ox_n and_o some_o other_o animal_n there_o be_v many_o more_o and_o they_o be_v place_v towards_o the_o small_a intestine_n the_o knowledge_n of_o the_o structure_n of_o these_o glandule_n do_v admirable_o serve_v to_o explain_v their_o use_n they_o be_v a_o heap_n of_o angular_a vesicles_n there_o be_v a_o communication_n between_o their_o cavite_n this_o be_v find_v by_o blow_v into_o they_o after_o you_o have_v thrust_v out_o all_o that_o fill_v they_o the_o air_n pass_v from_o one_o vesicle_n to_o another_o and_o make_v they_o appear_v such_o as_o we_o have_v describe_v they_o in_o fine_a we_o discover_v between_o the_o membrane_n of_o the_o mesentery_n certain_a small_a vessel_n which_o come_v from_o the_o intestine_n and_o pass_v into_o the_o glandule_n of_o which_o we_o have_v speak_v these_o vessel_n be_v ordinary_o full_a of_o lympha_fw-la and_o sometime_o we_o find_v they_o full_a of_o liquor_n like_a to_o milk_n which_o be_v the_o reason_n why_o they_o call_v they_o the_o lacteal_v vein_n this_o milk_n be_v nothing_o but_o the_o pure_a chyle_n which_o have_v pass_v from_o the_o cavity_n of_o the_o small_a intestine_n into_o that_o of_o the_o lacteal_v vein_n there_o be_v four_o experiment_n which_o confirm_v we_o in_o this_o opinion_n the_o first_o be_v that_o the_o milk_n which_o run_v into_o the_o lacteal_v vein_n come_v from_o the_o intestine_n this_o truth_n appear_v to_o the_o eye_n when_o the_o lacteal_v vein_n be_v press_v with_o the_o finger_n they_o empty_z themselves_o of_o the_o milk_n and_o we_o see_v it_o come_v afterward_o from_o the_o side_n of_o the_o intestine_n to_o fill_v the_o vein_n which_o have_v be_v empty_v the_o second_o be_v that_o milk_n be_v not_o to_o be_v find_v in_o the_o lacteal_v vein_n but_o some_o hour_n after_o the_o animal_n have_v eat_v the_o three_o be_v that_o we_o find_v the_o jejunum_n almost_o always_o empty_a because_o of_o the_o great_a number_n of_o lacteal_v vein_n which_o go_v from_o it_o moreover_o the_o lacteal_v vein_n have_v many_o valve_n place_v very_o near_a one_o another_o they_o be_v so_o dispose_v that_o they_o permit_v the_o chyle_n to_o run_v easy_o into_o the_o lacteal_v vein_n in_o go_v from_o the_o intestine_n to_o the_o glandule_n of_o the_o mesentery_n but_o they_o hinder_v its_o return_n they_o go_v from_o the_o intestine_n in_o great_a number_n and_o they_o be_v inosculate_v many_o of_o they_o together_o accord_v as_o they_o advance_v by_o this_o mean_n they_o make_v up_o some_o great_a vessel_n which_o empty_v the_o chyle_n that_o they_o carry_v into_o the_o vesicles_n of_o the_o glandule_n of_o the_o mesentery_n the_o chyle_n go_v into_o the_o vesicles_n of_o these_o glandule_n to_o receive_v there_o animal_n spirit_n which_o come_v thither_o in_o abundance_n by_o many_o nerve_n which_o proceed_v from_o the_o mesenterick_n plexus_fw-la these_o spirit_n render_v the_o chyle_n more_o subtle_a and_o fluid_a by_o their_o volatile_a alcalie_a and_o if_o there_o be_v any_o acidity_n in_o it_o they_o correct_v it_o by_o receive_v it_o into_o their_o alcaly_n and_o change_v it_o into_o salt_n after_o that_o the_o chyle_n have_v pass_v through_o the_o vesicles_n of_o the_o mesaraick_n glandule_n it_o discharge_v its_o self_n into_o two_o or_o three_o conduit_n which_o arise_v from_o under_o they_o they_o end_v afterward_o in_o a_o membranous_a bag_n situate_v above_o the_o vertebras_fw-la of_o the_o loin_n they_o call_v it_o the_o reservatory_n of_o the_o chyle_n the_o reservatory_n be_v the_o same_o thing_n with_o the_o cistern_n of_o the_o lympha_fw-la of_o which_o we_o have_v speak_v before_o in_o this_o place_n the_o chyle_n be_v mingle_v with_o much_o lympha_fw-la with_o which_o the_o reservatory_n be_v always_o full_a it_o dilate_v it_o and_o render_v it_o more_o liquid_a that_o it_o may_v run_v the_o more_o easy_o in_o fine_a there_o go_v from_o the_o reservatory_n of_o the_o chyle_n a_o conduit_n which_o be_v call_v the_o thoracick_a conduit_n for_o that_o it_o go_v alongst_o the_o vertebrae_n of_o the_o thorax_n sometime_o this_o conduit_n be_v fork_v and_o its_o branch_n unite_v again_o sometime_o it_o be_v altogether_o simple_a the_o thoracick_a conduit_n be_v insert_v into_o the_o subclavian_n vein_n above_o its_o insertion_n there_o be_v a_o valve_n which_o like_o a_o small_a vault_n cover_v it_o so_o that_o the_o blood_n which_o run_v through_o the_o subclavian_n vein_n run_v by_o without_o hinder_v the_o entry_n of_o the_o chyle_n when_o we_o blow_v in_o the_o thoracick_a conduit_n we_o perceive_v many_o valve_n in_o its_o cavity_n they_o be_v place_v at_o very_o small_a distance_n from_o one_o another_o and_o be_v so_o dispose_v that_o they_o permit_v the_o chyle_n easy_o to_o run_v towards_o the_o subclavian_n vein_n but_o they_o hinder_v it_o from_o descend_v into_o pecquets_n reservatory_n from_o whence_o we_o may_v conclude_v that_o the_o chyle_n run_v from_o its_o reservatory_n by_o the_o thoracick_a conduit_n into_o the_o left_a subclavian_n vein_n there_o it_o mingle_v with_o the_o blood_n who_o course_n it_o follow_v and_o go_v into_o the_o vena_fw-la cava_fw-la which_o carry_v it_o into_o the_o right_a auricle_n of_o the_o heart_n the_o auricle_n discharge_v it_o into_o the_o right_a ventricle_n and_o whereas_o the_o chyle_n make_v then_o a_o part_n of_o the_o blood_n it_o follow_v its_o course_n and_o circulat_v with_o it_o through_o all_o the_o body_n the_o fifteen_o discourse_n of_o the_o heart_n when_o the_o chyle_n be_v once_o enter_v into_o the_o subclavian_n vein_n it_o mingle_v its_o self_n with_o the_o blood_n and_o follow_v its_o course_n we_o must_v therefore_o follow_v the_o blood_n if_o we_o can_v know_v what_o become_v of_o the_o chyle_n the_o circulation_n of_o the_o blood_n show_v we_o that_o it_o run_v from_o the_o subclavian_n vein_n into_o the_o vena_fw-la cava_fw-la and_o from_o the_o vena_fw-la cava_fw-la it_o pass_v into_o a_o bag_n adhere_v to_o the_o right_a side_n of_o the_o heart_n this_o little_a bag_n they_o call_v the_o right_a auricle_n of_o the_o heart_n when_o this_o auricle_n be_v full_a of_o blood_n it_o contract_v its_o self_n and_o in_o contract_v its_o self_n shed_v it_o into_o a_o cavity_n
there_o be_v a_o communication_n between_o the_o fibre_n of_o the_o heart_n and_o those_o of_o the_o auricles_n by_o the_o interposal_n of_o the_o tendinous_a fibres_fw-fr which_o be_v gather_v altogether_o pure_a at_o the_o base_a of_o the_o heart_n we_o may_v look_v upon_o they_o as_o a_o tendon_n common_a to_o the_o heart_n and_o the_o auricles_n the_o animal_n spirit_n therefore_o which_o the_o nerve_n distil_v into_o this_o tendon_n do_v easy_o pass_v from_o the_o fibres_fw-es of_o the_o heart_n into_o the_o fibre_n of_o the_o auricles_n and_o from_o the_o fibres_fw-es of_o the_o auricles_n into_o those_o of_o the_o heart_n if_o we_o will_v yet_o form_v to_o ourselves_o a_o idea_n of_o the_o heart_n as_o clear_v and_o distinct_a as_o may_v be_v we_o may_v consider_v it_o as_o a_o muscle_n with_o three_o belly_n each_o auricle_n make_v one_o and_o the_o body_n of_o the_o heart_n make_v the_o three_o and_o the_o membrane_n which_o be_v at_o the_o base_a of_o the_o heart_n where_o the_o fibre_n of_o the_o heart_n and_o of_o the_o auricles_n do_v meet_v will_v be_v the_o common_a tendon_n the_o heart_n receive_v artery_n from_o the_o aorta_fw-la it_o send_v vein_n to_o the_o cava_fw-la it_o receive_v nerve_n from_o the_o plexus_fw-la cardiacus_fw-la and_o the_o par_fw-fr vagum_fw-la in_o fine_a the_o heart_n be_v shut_v up_o in_o a_o membranous_a bag_n which_o be_v call_v the_o pericardium_n the_o pericardium_n be_v strong_a and_o it_o be_v form_v of_o a_o texture_n of_o the_o tendinous_a fibres_fw-fr of_o the_o heart_n of_o some_o vein_n some_o artery_n and_o some_o nerve_n it_o contain_v always_o a_o little_a serosity_n which_o the_o small_a glandule_n that_o be_v place_v among_o the_o fat_a of_o the_o base_a of_o the_o heart_n do_v distil_v into_o it_o from_o what_o have_v be_v say_v we_o may_v conclude_v that_o when_o the_o auricles_n be_v full_a of_o blood_n the_o ventricles_n of_o the_o heart_n be_v empty_a and_o for_o that_o the_o auricles_n how_o soon_o they_o be_v full_a of_o blood_n do_v contract_n themselves_o the_o blood_n which_o they_o press_v into_o the_o ventricles_n of_o the_o heart_n be_v aid_v by_o the_o spring_n of_o their_o fibre_n do_v dilate_v they_o and_o constrain_v the_o animal_n spirit_n to_o get_v out_o of_o they_o and_o to_o run_v into_o the_o auricles_n to_o accomplish_v their_o contraction_n but_o as_o soon_o as_o the_o auricles_n be_v contract_v the_o blood_n which_o advance_v on_o all_o side_n joyn_v with_o the_o force_n of_o the_o spring_n of_o their_o fibre_n restore_v they_o to_o their_o former_a state_n and_o the_o spirit_n pass_v in_o that_o moment_n from_o the_o auricles_n to_o the_o heart_n shut_v it_o up_o and_o cause_v its_o contraction_n it_o be_v for_o this_o reason_n that_o the_o auricles_n empty_a themselves_o when_o the_o ventricles_n of_o the_o heart_n be_v fill_v and_o that_o the_o auricles_n fill_v themselves_o when_o the_o ventricles_n be_v empty_v the_o heart_n by_o its_o contraction_n throw_v the_o blood_n from_o its_o ventricles_n into_o the_o artery_n but_o for_o that_o the_o artery_n become_v still_o narrow_a the_o blood_n can_v be_v throw_v out_o impetuous_o without_o swell_v they_o when_o they_o be_v thus_o blow_v up_o they_o restore_v themselves_o to_o their_o former_a state_n by_o the_o spring_n of_o their_o fibre_n and_o by_o this_o mean_v make_v a_o part_n of_o the_o blood_n which_o they_o have_v receive_v run_v into_o the_o vein_n of_o the_o heart_n and_o since_o the_o heart_n throw_v out_o the_o blood_n into_o the_o artery_n by_o several_a stroke_n the_o artery_n must_v needs_o be_v blow_v up_o and_o fall_v again_o by_o several_a turn_n it_o be_v this_o motion_n of_o the_o artery_n which_o they_o call_v the_o pulse_n concern_v which_o it_o be_v to_o be_v remark_v that_o the_o dilatation_n of_o the_o artery_n accompany_v the_o contraction_n of_o the_o heart_n and_o the_o contraction_n of_o the_o artery_n accompany_v its_o dilatation_n those_o who_o be_v satisfy_v with_o what_o they_o conceive_v clear_o will_v be_v content_v to_o ascribe_v to_o the_o heart_n the_o office_n of_o press_v the_o blood_n into_o the_o artery_n and_o of_o be_v the_o principal_a instrument_n of_o its_o circulation_n they_o may_v leave_v to_o those_o who_o believe_v that_o the_o heart_n be_v the_o organ_n of_o sanguification_n the_o satisfaction_n they_o have_v to_o be_v please_v with_o a_o conjecture_n ill_o found_v as_o shall_v be_v make_v appear_v afterward_o the_o sixteenth_o discourse_n of_o the_o lung_n we_o have_v say_v in_o the_o precede_a chapter_n that_o when_o the_o blood_n go_v from_o the_o right_a ventricle_n of_o the_o heart_n it_o pass_v into_o the_o pulmonary_a artery_n this_o artery_n be_v divide_v into_o many_o great_a branch_n which_o enter_v into_o the_o body_n of_o the_o lung_n and_o these_o branch_n be_v again_o divide_v into_o other_o and_o these_o into_o other_o till_o at_o last_o the_o small_a of_o they_o be_v lose_v into_o the_o substance_n of_o the_o lung_n the_o pulmonary_a artery_n be_v not_o spread_v alone_o in_o the_o lung_n it_o be_v every_o where_o accompany_v with_o the_o pulmonary_a vein_n a_o branch_n of_o a_o nerve_n which_o come_v from_o the_o par_fw-fr vagum_fw-la a_o small_a artery_n which_o go_v from_o the_o aorta_fw-la and_o which_o they_o call_v the_o bronchial_a artery_n with_o a_o small_a vein_n which_o be_v pass_v into_o the_o vena_fw-la cava_fw-la and_o which_o they_o call_v the_o bronchial_a vein_n and_o a_o certain_a cartilaginous_a conduit_n which_o they_o name_v the_o bronchiae_n the_o bronchiae_n be_v nothing_o but_o the_o ramification_n of_o a_o great_a cartilaginous_a pipe_n which_o extend_v its_o self_n from_o the_o bottom_n of_o the_o mouth_n even_o to_o the_o lung_n it_o lie_v above_o the_o oesophagus_n and_o be_v place_v in_o the_o before_o part_n of_o the_o neck_n they_o call_v it_o the_o arteria_fw-la trachaea_n there_o be_v at_o the_o top_n of_o the_o arteria_fw-la trachaea_n a_o horny_a part_n which_o they_o name_v the_o larinx_n it_o be_v make_v up_o of_o five_o cartilage_n that_o which_o take_v up_o its_o forepart_n make_v that_o eminence_n which_o in_o man_n they_o call_v adam_n bit._n its_o figure_n be_v almost_o like_a unto_o that_o of_o that_o buckler_n which_o among_o the_o latin_n be_v call_v scutum_fw-la for_o this_o reason_n they_o name_v it_o the_o scutiform_a cartilege_n the_o second_o be_v call_v the_o annular_a it_o be_v make_v like_o the_o ring_n which_o the_o turk_n make_v use_v of_o for_o draw_v the_o bow_n it_o be_v straight_o before_o and_o large_o behind_o it_o embrace_v the_o whole_a larinx_n and_o be_v fasten_v into_o the_o scutiform_a the_o three_o and_o four_o be_v call_v the_o aritenoide_n they_o be_v the_o production_n of_o the_o annular_a place_v on_o its_o hinder_a part_n and_o separate_v from_o one_o another_o by_o a_o small_a slit_n they_o make_v that_o part_n of_o the_o larinx_n which_o they_o call_v the_o glottis_fw-la the_o five_o be_v a_o cartilege_n fasten_v above_o the_o upper_a part_n of_o the_o scutiform_a cartilege_n they_o call_v it_o the_o epiglottis_fw-la it_o be_v figure_n be_v triangular_a and_o its_o substance_n soft_a than_o that_o of_o the_o other_o it_o be_v base_a adhere_v to_o the_o scutiform_a cartilege_n and_o the_o rest_n of_o its_o body_n be_v disengage_v from_o any_o other_o part_n it_o be_v usual_o lift_v up_o this_o be_v that_o cartilege_n which_o the_o aliment_n put_v down_o in_o pass_v from_o the_o mouth_n into_o the_o oesophagus_n when_o it_o be_v down_o it_o shut_v the_o entry_n of_o the_o trachaeal_a artery_n and_o thereby_o hinder_v the_o aliment_n from_o go_v into_o it_o the_o larinx_n be_v reckon_v to_o have_v thirteen_o muscle_n there_o be_v four_o of_o they_o which_o be_v common_a to_o it_o with_o other_o part_n and_o nine_o which_o do_v proper_o appertain_v to_o it_o the_o first_o pair_n of_o the_o common_a one_o be_v name_v the_o sternothyoidians_n they_o arise_v from_o the_o top_n of_o the_o sternum_n lie_v above_o the_o trachaeal_a artery_n and_o be_v fasten_v to_o the_o inferior_a part_n of_o the_o scutiform_a cartilege_n when_o their_o fibre_n be_v contract_v they_o draw_v the_o scutiform_a downward_o the_o second_o pair_n be_v make_v of_o the_o hyothyroidians_n they_o arise_v from_o the_o base_a of_o the_o os_fw-la hyoide_v and_o be_v fasten_v to_o the_o base_a of_o the_o scutiform_a they_o serve_v by_o the_o contraction_n of_o their_o fibre_n to_o lift_v up_o the_o larinx_n the_o first_o pair_n of_o muscle_n proper_a to_o the_o larinx_n be_v make_v of_o the_o anteriour_a cricothyroidians_n they_o derive_v their_o origin_n from_o the_o forepart_n of_o the_o annular_a cartilege_n and_o they_o end_v at_o the_o low_a part_n of_o the_o same_o cartilege_n by_o their_o action_n they_o dilate_v it_o the_o second_o be_v make_v of_o the_o posteriour_a
the_o least_o resistance_n it_o find_v none_o at_o the_o entry_n of_o the_o tracheal_n artery_n and_o it_o rencounter_v every_o where_o else_o there_o it_o enter_v it_o get_v into_o the_o bronchiae_n from_o hence_o it_o pass_v into_o the_o vesicles_n of_o the_o lung_n it_o blow_v they_o up_o as_o much_o as_o be_v needful_a for_o they_o to_o occupy_v as_o much_o space_n as_o the_o wall_n of_o the_o breast_n do_v abandon_v even_o as_o the_o motion_n which_o be_v give_v to_o the_o two_o board_n of_o a_o pair_n of_o bellows_o when_o they_o be_v raise_v from_o one_o another_o do_v thrust_v as_o much_o air_n into_o the_o bellows_o as_o be_v needful_a to_o occupy_v the_o space_n which_o the_o board_n of_o the_o bellows_o have_v leave_v by_o this_o mean_v the_o muscle_n which_o serve_v to_o draw_v down_o the_o rib_n have_v their_o fibre_n extreme_o stretch_v to_o the_o length_n the_o fibre_n of_o the_o musculous_a tunicle_n of_o the_o tracheal_n artery_n and_o of_o the_o bronchiae_n be_v also_o great_o stretch_v both_o the_o one_o and_o the_o other_o by_o their_o spring_n do_v rebound_v the_o nerve_n send_v some_o spirit_n into_o their_o cavity_n they_o be_v shorten_v by_o this_o contraction_n the_o rib_n be_v force_v downward_o the_o cavity_n of_o the_o breast_n be_v diminish_v and_o the_o cartilage_n of_o the_o bronchiae_n do_v re-enter_v into_o one_o another_o so_o the_o air_n which_o the_o vesicles_n of_o the_o lung_n do_v contain_v be_v so_o press_v that_o it_o go_v out_o it_o pass_v from_o the_o vesicles_n into_o the_o bronchiae_n from_o the_o bronchiae_fw-la into_o the_o tracheal_n artery_n and_o from_o thence_o out_o of_o the_o body_n and_o it_o be_v this_o go_v out_o of_o the_o air_n from_o the_o lung_n which_o be_v call_v expiration_n since_o respiration_n be_v no_o other_o thing_n but_o inspiration_n immediate_o follow_v by_o expiration_n and_o this_o expiration_n follow_v as_o quick_o by_o a_o new_a inspiration_n and_o so_o forward_o we_o may_v very_o well_o affirm_v that_o respiration_n be_v make_v by_o mean_n of_o the_o muscle_n of_o the_o breast_n of_o the_o diaphragm_n of_o the_o musculous_a tunicle_n of_o the_o tracheal_n artery_n and_o of_o the_o bronchiae_n these_o organ_n act_v successive_o and_o the_o action_n of_o the_o one_o hinder_v the_o action_n of_o the_o other_o from_o whence_o we_o conclude_v that_o we_o may_v in_o reason_n consider_v they_o as_o antagonist_n muscle_n all_o the_o blood_n which_o pass_v through_o the_o right_a ventricle_n of_o the_o heart_n go_v from_o thence_o into_o the_o lung_n and_o the_o lung_n receive_v the_o external_n air_n into_o their_o vesicles_n so_o we_o have_v ground_n to_o think_v that_o this_o air_n produce_v some_o change_n in_o the_o blood_n which_o pass_v through_o the_o lung_n we_o remark_n indeed_o a_o great_a difference_n between_o the_o blood_n which_o enter_v into_o the_o lung_n and_o the_o blood_n which_o go_v out_o of_o they_o that_o which_o enter_v by_o the_o pulmonary_a artery_n be_v of_o a_o red_a passable_o deep_a whereas_o that_o which_o return_v from_o the_o lung_n by_o the_o pulmonary_a vein_n be_v of_o a_o bright_a and_o fluid_a red._n behold_v a_o very_a considerable_a change_n which_o befall_v the_o blood_n in_o pass_v through_o the_o lung_n this_o change_n can_v be_v make_v but_o by_o the_o air_n which_o blow_v up_o their_o vesicles_n and_o by_o this_o mean_n press_v the_o small_a artery_n and_o the_o small_a vein_n which_o be_v spread_v there_o this_o pressure_n do_v mingle_v more_o exact_o the_o principle_n of_o blood_n and_o do_v oblige_v it_o to_o run_v more_o quick_o into_o the_o branch_n of_o the_o pulmonary_a vein_n to_o go_v from_o thence_o into_o the_o left_a ventricle_n of_o the_o heart_n but_o because_o this_o exact_a mixture_n of_o the_o principle_n of_o the_o blood_n and_o this_o passage_n from_o the_o artery_n into_o the_o vein_n be_v not_o capable_a of_o produce_v the_o change_n that_o we_o have_v remark_v it_o must_v needs_o be_v that_o some_o principle_n of_o air_n extreme_o subtle_a mingle_v with_o it_o this_o principle_n may_v pass_v through_o the_o pore_n of_o the_o artery_n and_o insinuate_v its_o self_n among_o the_o part_n of_o the_o blood_n that_o which_o make_v the_o thing_n yet_o more_o probable_a be_v that_o the_o blood_n which_o be_v expose_v to_o the_o air_n acquire_v a_o surface_n extreme_o red_a and_o of_o a_o colour_n like_o to_o that_o of_o the_o blood_n which_o come_v from_o the_o lung_n by_o the_o pulmonary_a vein_n by_o which_o we_o see_v that_o the_o air_n produce_v in_o the_o blood_n a_o bright_a and_o florid_n red_a by_o be_v mingle_v with_o it_o since_o therefore_o the_o air_n do_v produce_v this_o effect_n we_o can_v in_o reason_n doubt_n that_o the_o change_n of_o colour_n which_o befall_v the_o blood_n in_o pass_v through_o the_o lung_n come_v from_o the_o air_n which_o swell_v its_o vesicles_n all_o the_o difference_n which_o be_v between_o the_o blood_n of_o the_o vein_n and_o that_o of_o the_o artery_n be_v the_o same_o with_o that_o of_o the_o blood_n which_o enter_v into_o the_o lung_n and_o of_o that_o which_o come_v from_o they_o so_o we_o may_v true_o affirm_v that_o this_o difference_n be_v make_v in_o the_o lung_n and_o not_o in_o the_o ventricles_n of_o the_o heart_n where_o the_o blood_n do_v not_o receive_v any_o alteration_n for_o if_o you_o take_v blood_n out_o of_o the_o vena_fw-la cava_fw-la and_o afterward_o out_o of_o the_o pulmonary_a artery_n you_o shall_v find_v no_o difference_n between_o these_o two_o blood_n nevertheless_o that_o which_o be_v take_v out_o of_o the_o pulmonary_a artery_n have_v pass_v through_o the_o right_a ventricle_n of_o the_o heart_n after_o this_o if_o you_o take_v of_o the_o blood_n of_o the_o pulmonary_a vein_n and_o afterward_o of_o the_o aorta_fw-mi you_o shall_v see_v that_o these_o two_o blood_n be_v alike_o in_o all_o thing_n though_o the_o one_o have_v be_v take_v at_o its_o entry_n into_o the_o left_a ventricle_n of_o the_o heart_n and_o the_o other_o at_o its_o go_v out_o it_o remain_v as_o yet_o to_o examine_v what_o be_v the_o principle_n of_o air_n which_o produce_v the_o change_n that_o the_o blood_n contract_v in_o pass_v through_o the_o lung_n when_o we_o consider_v the_o air_n narrow_o we_o find_v among_o many_o principle_n which_o compose_v it_o a_o nitrous_a spirit_n spread_v through_o all_o its_o mass_n there_o be_v in_o physic_n and_o chymie_n a_o prodigious_a number_n of_o experiment_n which_o render_v the_o thing_n certain_a and_o because_o the_o spirit_n of_o nitre_n do_v produce_v in_o the_o blood_n the_o same_o change_n with_o the_o air_n we_o have_v ground_n to_o think_v that_o the_o change_n which_o the_o air_n make_v in_o the_o blood_n as_o it_o pass_v through_o the_o lung_n proceed_v from_o the_o nitrous_a spirit_n of_o the_o air_n its_o mingle_v with_o it_o the_o spirit_n of_o nitre_n be_v compose_v of_o acid_n and_o alcaly_n the_o alcaly_n do_v rarify_v the_o sulphur_n of_o the_o blood_n and_o the_o acid_v ferment_n with_o its_o volatile_a alcaly_n the_o blood_n become_v thereby_o more_o subtle_a more_o agitate_a and_o more_o ratify_v from_o all_o this_o we_o may_v conclude_v that_o the_o respiration_n serve_v to_o make_v the_o blood_n pass_v from_o the_o pulmonary_a artery_n into_o the_o pulmonary_a vein_n and_o to_o keep_v up_o the_o fermentation_n of_o it_o by_o mean_n of_o the_o nitrous_a spirit_n which_o mingle_v its_o self_n with_o it_o and_o since_o this_o spirit_n heighten_v the_o red_a colour_n of_o the_o blood_n it_o may_v be_v also_o say_v that_o the_o respiration_n serve_v to_o maintain_v it_o and_o that_o by_o its_o mean_n the_o lympha_fw-la and_o chyle_n which_o do_v mingle_v with_o it_o take_v by_o degree_n its_o colour_n and_o nature_n the_o ninteenth_n discourse_n of_o the_o spleen_n when_o we_o follow_v the_o blood_n which_o go_v out_o of_o the_o left_a ventricle_n of_o the_o heart_n we_o find_v that_o the_o first_o entrail_n of_o those_o which_o we_o have_v not_o yet_o examine_v to_o which_o it_o go_v be_v the_o spleen_n it_o be_v of_o a_o red_a colour_n of_o a_o considerable_a bigness_n place_v in_o the_o low_a belly_n on_o the_o left_a side_n and_o a_o little_a low_o than_o the_o liver_n in_o the_o spleen_n there_o be_v a_o artery_n and_o a_o nerve_n which_o do_v enter_v into_o it_o in_o company_n and_o a_o vein_n which_o go_v out_o at_o the_o same_o place_n these_o artery_n end_v in_o little_a membranous_a cell_n who_o figure_n do_v near_o resemble_v the_o leaf_n of_o the_o fearn_n the_o vein_n derive_v its_o origine_fw-la from_o the_o same_o cell_n this_o appear_v when_o we_o blow_v into_o the_o artery_n or_o the_o vein_n for_o the_o breath_n pass_v into_o the_o cell_n these_o cell_n be_v all_o fill_v with_o small_a glandule_n