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 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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
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 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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 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fibre_n be_v not_o blow_v up_o but_o by_o they_o it_o be_v clear_a that_o if_o their_o course_n beâ—â—_n interrupt_v that_o they_o can_v flow_v into_o their_o cavity_n they_o can_v dilate_v they_o experience_n confirm_v this_o in_o that_o if_o you_o cut_v or_o tie_v a_o nerve_n with_o a_o thread_n the_o muscle_n which_o receive_v branch_n from_o it_o become_v flaccid_a and_o do_v what_o you_o will_v its_o fibre_n do_v not_o swell_v the_o second_o thing_n needful_a for_o the_o blow_v up_o of_o the_o fibre_n be_v the_o free_a course_n of_o the_o blood_n through_o the_o artery_n and_o vein_n of_o the_o muscle_n for_o since_o the_o tendinous_a fibre_n can_v be_v dilate_v without_o straighten_v the_o artery_n and_o vein_n and_o the_o artery_n and_o vein_n can_v be_v straighten_a without_o void_v the_o blood_n that_o fill_v they_o it_o be_v visible_a that_o if_o the_o blood_n stop_v there_o it_o will_v hinder_v the_o tendinous_a fibres_fw-fr from_o be_v blow_v up_o this_o be_v so_o true_a 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that_o which_o make_v my_o conjecture_n probable_a be_v that_o we_o see_v by_o the_o eye_n that_o the_o substance_n of_o the_o cartilage_n be_v nothing_o but_o a_o heap_n of_o fibres_n and_o that_o which_o put_v the_o thing_n out_o of_o doubt_n be_v that_o in_o young_a animal_n many_o part_n which_o be_v tendinous_a become_v at_o length_n cartilaginous_a and_o that_o we_o observe_v frequent_o in_o old_a animal_n that_o certain_a tendon_n be_v change_v into_o cartilage_n as_o tendon_n be_v change_v at_o length_n into_o cartilage_n the_o cartilage_n be_v likewise_o change_v into_o bone_n if_o therefore_o we_o have_v conclude_v the_o cartilage_n be_v nothing_o but_o a_o composure_n of_o tendinous_a fibres_n for_o that_o the_o tendon_n be_v sometime_o change_v into_o cartilage_n we_o be_v oblige_v by_o the_o same_o reason_n to_o judge_v that_o bone_n be_v nothing_o but_o a_o composure_n of_o tendinous_a fibres_n which_o after_o have_v be_v harden_v to_o become_v cartilage_n be_v 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