more_o ready_o to_o its_o motion_n upward_o be_v less_o compact_a above_o then_o below_o i_o shall_v produce_v two_o or_o three_o instance_n which_o prove_v that_o if_o it_o have_v but_o less_o liberty_n to_o ascend_v by_o the_o opposition_n of_o some_o other_o body_n then_o to_o descend_v it_o will_v as_o natural_o fly_v downward_o as_o it_o do_v now_o upward_o when_o it_o be_v otherwise_o and_o i_o shall_v also_o prove_v that_o if_o it_o have_v but_o a_o equal_a resistance_n on_o each_o side_n it_o will_v expand_v orbicular_o and_o first_o that_o if_o flame_n have_v but_o a_o equal_a resistance_n from_o ambient_fw-la body_n on_o each_o side_n it_o will_v expand_v orbicular_o will_v be_v prove_v by_o this_o experiment_n viz._n fill_v a_o hollow_a globe_n with_o gunpowder_n one_o side_n of_o which_o be_v a_o little_o thin_a than_o the_o other_o and_o whatever_o way_n that_o thin_a side_n be_v turn_v whether_o down_o upward_o or_o horizon-ward_n the_o gunpowder_n will_v expand_v and_o break_v out_o that_o way_n second_o to_o prove_v that_o if_o there_o be_v but_o more_o liberty_n for_o the_o descent_n than_o ascent_n of_o it_o fleame_z will_v natural_o fly_v downward_o we_o need_v but_o shoot_v a_o gun_n off_o with_o the_o mouth_n downward_o for_o the_o explauded_a gunpowder_n find_v a_o open_a and_o easy_a passage_n downward_o and_o be_v resist_v upward_o and_o on_o each_o side_n it_o natural_o descend_v but_o some_o perhaps_o that_o do_v not_o thorough_o understand_v why_o a_o thing_n be_v say_v natural_o to_o ascend_v or_o descend_v may_v be_v unwilling_a to_o believe_v that_o when_o a_o gun_n be_v shoot_v downward_o the_o motion_n of_o the_o flame_n be_v a_o natural_a motion_n but_o may_v rather_o think_v it_o preternatural_a but_o that_o it_o may_v appear_v that_o it_o be_v as_o true_o a_o naral_a motion_n in_o philosophy_n philosophy_n as_o the_o ascend_a motion_n of_o it_o i_o shall_v consider_v why_o flame_n may_v be_v say_v natural_o to_o ascend_v fleame_z then_o be_v say_v natural_o to_o ascend_v because_o it_o be_v the_o nature_n of_o it_o for_o the_o most_o part_n to_o do_v so_o which_o be_v as_o much_o as_o to_o say_v the_o nature_n of_o flame_n incline_v it_o to_o ascend_v how_o the_o nature_n of_o it_o incline_v it_o to_o ascend_v i_o have_v already_o show_v and_o that_o there_o be_v the_o same_o reason_n why_o the_o descend_a motion_n shall_v be_v term_v natural_a will_v easy_o be_v prove_v for_o as_o it_o be_v natural_a for_o it_o to_o ascend_v as_o long_o as_o it_o have_v only_o the_o air_n to_o oppose_v its_o motion_n so_o it_o be_v its_o nature_n to_o descend_v when_o the_o order_n of_o opposition_n be_v change_v and_o the_o latter_a be_v as_o much_o a_o natural_a motion_n as_o the_o former_a all_o that_o diversify_v the_o tendency_n of_o flame_n be_v those_o accidental_a circumstance_n which_o be_v about_o it_o and_o as_o a_o ball_n cast_v against_o the_o bottom_n of_o a_o room_n rebound_v upward_o and_o when_o it_o be_v throw_v against_o the_o top_n of_o it_o as_o natural_o fly_v down_o so_o flame_n be_v in_o a_o brisk_a motion_n natural_o fly_v up_o or_o down_o as_o the_o part_n of_o matter_n it_o strike_v against_o resist_v it_o and_o cause_v it_o to_o fly_v back_o from_o they_o have_v make_v this_o short_a digression_n i_o shall_v proceed_v next_o to_o examine_v examine_v diemerbroek_n opinion_n who_o think_v that_o the_o vital_a spirit_n by_o reason_n of_o its_o volatility_n always_o endeavour_v to_o fly_v away_o do_v continual_o agitate_v those_o grosser_n particle_n of_o the_o blood_n with_o which_o it_o be_v entangle_v and_o detain_v from_o flight_n and_o be_v diverse_o vibrate_v and_o beat_v back_o and_o so_o the_o whole_a mass_n be_v keep_v in_o a_o continual_a fermentative_a motion_n there_o be_v a_o heat_n produce_v in_o it_o which_o in_o a_o great_a agitation_n be_v great_a etc._n etc._n and_o so_o differ_v according_a to_o the_o different_a degree_n of_o agitation_n all_o that_o i_o shall_v or_o need_v to_o take_v notice_n of_o here_o be_v that_o that_o agitation_n of_o particle_n which_o he_o say_v cause_v the_o heat_n of_o the_o blood_n rather_o produce_v a_o sensation_n of_o heat_n by_o affect_v our_o sense_n in_o their_o motion_n than_o produce_v that_o which_o we_o call_v heat_n in_o the_o blood_n but_o to_o know_v the_o true_a reason_n of_o the_o heat_n of_o the_o blood_n we_o must_v understand_v how_o those_o particle_n be_v put_v into_o motion_n which_o by_o affect_v our_o sensory_a cause_n such_o a_o sensation_n so_o that_o he_o seem_v to_o i_o to_o say_v no_o more_o then_o that_o that_o which_o have_v a_o power_n to_o cause_n heat_n be_v the_o cause_n of_o that_o power_n when_o he_o ought_v in_o order_n to_o explain_v the_o heat_n of_o the_o blood_n to_o have_v show_v from_o whence_o that_o power_n proceed_v the_o reason_n of_o which_o i_o shall_v have_v take_v in_o some_o measure_n for_o the_o reason_n of_o the_o heat_n potential_o in_o the_o mass_n of_o blood_n but_o from_o what_o he_o have_v say_v it_o appear_v that_o he_o have_v not_o explain_v the_o true_a reason_n of_o the_o heat_n of_o the_o blood_n so_o plain_o that_o i_o need_v say_v no_o more_o against_o it_o dr._n henshaw_n think_v that_o the_o dissimilitude_n betwixt_o the_o chyle_n consider_v and_o blood_n be_v so_o great_a that_o it_o become_v immediate_o the_o cause_n of_o a_o extraordinary_a ebullition_n upon_o their_o mixture_n together_o which_o be_v very_o much_o increase_v by_o the_o reciprocal_a motion_n of_o the_o lung_n whereby_o the_o blood_n be_v wrought_v into_o a_o froth_n by_o that_o time_n it_o get_v into_o the_o left_a ventricle_n of_o the_o heart_n which_o sudden_a excess_n of_o heat_n he_o think_v not_o unlike_o what_o happen_v upon_o the_o mix_n of_o several_a chemical_a liquor_n together_o for_o the_o heat_n often_o become_v so_o great_a that_o they_o often_o endanger_v the_o vessel_n that_o contain_v they_o but_o he_o may_v as_o well_o have_v say_v that_o there_o be_v so_o great_a a_o dissimilitude_n betwixt_o hot_a blood_n and_o cold_a milk_n that_o as_o soon_o as_o the_o milk_n be_v mix_v with_o it_o it_o will_v cause_v a_o extraordiary_a ebullition_n and_o that_o by_o expose_v they_o to_o the_o air_n &_o run_v they_o through_o pipe_n the_o heat_n will_v increase_v but_o this_o be_v so_o plain_o false_a that_o it_o need_v no_o other_o argument_n but_o reflection_n to_o convince_v the_o weak_a reason_n and_o he_o may_v equal_o as_o well_o conclude_v that_o water_n will_v kindle_v a_o fire_n and_o increase_v the_o flame_n of_o it_o because_o oil_n will_v as_o that_o chyle_n will_v put_v the_o blood_n into_o a_o heat_n because_o oil_n of_o turpentine_n and_o spirit_n of_o wine_n will_v grow_v hot_a when_o mix_v together_o but_o the_o conclusion_n be_v manifest_o absurd_a i_o shall_v in_o the_o next_o place_n endeavour_v to_o show_v the_o reason_n of_o the_o heat_n of_o the_o blood_n as_o evident_o as_o possible_o i_o can_v from_o what_o i_o have_v already_o say_v in_o answer_n to_o dr._n willis_n opinion_n it_o sufficient_o appear_v that_o whether_o we_o say_v the_o blood_n grow_v hot_a per_fw-la admotum_fw-la calidi_fw-la accension_n or_o any_o other_o way_n it_o be_v no_o more_o than_o to_o express_v the_o same_o thing_n several_a way_n or_o to_o make_v word_n different_a in_o sound_n to_o express_v one_o and_o the_o same_o thing_n but_o as_o all_o that_o have_v write_v on_o this_o subject_a have_v make_v choice_n of_o a_o opinion_n different_a name_n to_o signify_v the_o heat_n of_o the_o blood_n by_o whilst_o some_o will_v have_v it_o do_v by_o accension_n other_o by_o attrition_n etc._n etc._n so_o they_o have_v by_o that_o mean_n rather_o dispute_v about_o name_n and_o word_n than_o any_o real_a and_o fundamental_a difference_n in_o their_o opinion_n i_o shall_v not_o here_o enter_v into_o a_o dispute_n whether_o the_o blood_n when_o it_o become_v hot_a may_v most_o proper_o be_v say_v to_o grow_v hot_a or_o its_o heat_n express_v by_o any_o one_o of_o those_o title_n they_o have_v be_v please_v to_o signify_v it_o by_o for_o as_o in_o discourse_v about_o the_o constituent_a part_n of_o a_o man_n it_o be_v not_o necessary_a to_o fix_v any_o name_n upon_o that_o man_n but_o whether_o it_o be_v thomas_n robert_n or_o william_n the_o constituent_a part_n of_o he_o if_o he_o be_v a_o perfect_a man_n will_v still_o be_v the_o same_o so_o in_o discourse_v concern_v the_o heat_n of_o the_o blood_n and_o consider_v the_o principal_a cause_n or_o agent_n and_o the_o more_o remote_a and_o accessary_a cause_n it_o be_v no_o matter_n at_o all_o whether_o the_o consequence_n of_o these_o cause_n be_v signify_v by_o the_o word_n accension_n attrition_n or_o fermentation_n because_o the_o difference_n of_o the_o
any_o thing_n as_o one_o that_o be_v in_o a_o fit_a of_o the_o epilepsy_n but_o our_o body_n be_v accustom_v to_o it_o and_o it_o be_v make_v agreeable_a and_o consistent_a with_o circulation_n of_o the_o blood_n become_v less_o troublesome_a when_o we_o have_v occasion_n for_o extraordinary_a respiration_n for_o these_o reason_n it_o be_v plain_a why_o the_o lung_n ought_v to_o be_v in_o a_o continual_a reciprocal_a motion_n the_o first_o of_o which_o be_v self-evident_a and_o needs_o no_o further_a proof_n and_o the_o second_o be_v sufficient_o evince_v by_o the_o consequence_n that_o follow_v when_o this_o lympha_fw-la be_v not_o evacuate_v when_o it_o be_v too_o thick_a or_o too_o much_o in_o quantity_n or_o on_o the_o other_o people_n side_n the_o air_n which_o we_o breath_n be_v too_o thick_a and_o moist_a and_o it_o be_v not_o due_o carry_v off_o there_o follow_v obstruction_n of_o the_o duct_n of_o the_o trachea_n from_o whence_o proceed_v symptom_n of_o a_o asthma_n orthopnaea_n and_o duspnaea_n some_o sort_n of_o phthisicks_n and_o a_o great_a many_o more_o dangerous_a symptom_n for_o when_o it_o be_v too_o thick_a it_o stick_v fast_o to_o the_o coat_n of_o the_o lung_n and_o not_o be_v easy_o enough_o mix_v and_o incorporate_v with_o the_o air_n the_o quantity_n of_o it_o increase_v till_o it_o stuff_v up_o the_o cavity_n of_o the_o lung_n and_o when_o it_o be_v too_o much_o in_o quantity_n though_o it_o be_v thin_a enough_o yet_o the_o air_n be_v not_o able_a to_o carry_v it_o off_o fast_o enough_o it_o run_v down_o the_o side_n of_o those_o tender_a vessel_n and_o by_o a_o gentle_a irritation_n raise_v a_o tickle_a cough_n last_o when_o the_o humour_n that_o moisten_v the_o lung_n be_v almost_o natural_a as_o to_o quality_n and_o quantity_n yet_o if_o the_o air_n be_v thick_a and_o moist_a it_o be_v so_o much_o impregnate_v with_o its_o own_o moisture_n be_v incapable_a of_o carry_v off_o the_o moisture_n supply_v by_o the_o serum_n of_o the_o blood_n whence_o people_n that_o be_v incline_v to_o obstruction_n of_o their_o lung_n in_o foggy_a and_o moist_a air_n find_v they_o more_o oppress_v that_o moisture_n which_o ought_v to_o be_v carry_v off_o be_v leave_v behind_o but_o if_o we_o consider_v further_o the_o use_n of_o the_o lung_n with_o respect_n to_o body_n the_o body_n we_o shall_v find_v other_o reason_n not_o only_o why_o it_o shall_v be_v in_o a_o constant_a motion_n but_o also_o we_o may_v understand_v why_o we_o can_v live_v without_o a_o continual_a and_o free_a circulation_n for_o in_o respect_n of_o the_o body_n the_o lung_n seem_v in_o some_o measure_n heart_n to_o perform_v the_o office_n of_o another_o heart_n and_o as_o the_o left_a ventricle_n of_o the_o heart_n contract_v send_v out_o the_o blood_n into_o all_o the_o part_n of_o the_o body_n by_o the_o ramification_n of_o the_o sanguiferous_a vessel_n so_o the_o lung_n contract_v force_v the_o blood_n contain_v in_o the_o sanguiferous_a vessel_n which_o be_v distribute_v through_o their_o lobe_n into_o the_o left_a ventricle_n of_o the_o heart_n and_o the_o left_a ventricle_n be_v by_o that_o mean_n more_o vigorous_o dilate_v and_o more_o plentiful_o fill_v with_o blood_n a_o large_a quantity_n of_o it_o be_v force_v out_o into_o the_o aorta_n and_o consequent_o the_o blood_n in_o the_o branch_n of_o the_o aorta_n be_v more_o copious_o press_v by_o subsequent_a matter_n into_o the_o root_n of_o the_o vena_fw-la cava_fw-la and_o so_o forward_o into_o the_o right_a ventricle_n of_o the_o heart_n so_o that_o by_o the_o help_n of_o the_o lung_n the_o dilation_n of_o the_o left_a ventricle_n of_o the_o heart_n be_v immediate_o and_o the_o dilation_n of_o the_o right_a mediate_o promote_v that_o the_o lung_n thus_o promote_v the_o dilation_n of_o the_o ventricles_n of_o the_o heart_n it_o be_v very_o reasonable_a to_o believe_v not_o only_o because_o it_o be_v self-evident_a but_o because_o otherwise_o it_o will_v be_v very_o hard_a to_o conceive_v since_o the_o motion_n of_o the_o heart_n be_v only_a contraction_n and_o the_o dilation_n of_o its_o ventricles_n only_o a_o cessation_n from_o that_o motion_n how_o the_o blood_n be_v force_v into_o they_o with_o vigour_n enough_o to_o distend_v their_o cavity_n for_o there_o be_v so_o little_a reason_n to_o expect_v that_o they_o shall_v dilate_v of_o their_o own_o accord_n that_o we_o shall_v rather_o believe_v they_o will_v be_v continual_o contract_v since_o all_o the_o weight_n of_o blood_n contain_v in_o the_o whole_a sanguiferous_a vessel_n of_o the_o lung_n can_v not_o possible_o dilate_v they_o without_o some_o other_o force_n to_o help_v it_o for_o the_o substance_n of_o the_o heart_n be_v contract_v and_o the_o cavity_n of_o the_o left_a ventricle_n so_o considerable_o diminish_v so_o small_a a_o portion_n of_o blood_n as_o have_v liberty_n to_o press_v against_o its_o orifice_n will_v make_v but_o a_o weak_a pressure_n and_o much_o too_o small_a to_o dilate_v the_o ventricle_n in_o so_o little_a time_n as_o intervene_v the_o successive_a contraction_n beside_o the_o heart_n have_v no_o tendency_n at_o all_o to_o dilate_v itself_o since_o that_o will_v make_v it_o unapt_a to_o yield_v to_o contraction_n we_o must_v suppose_v that_o a_o part_n of_o such_o substance_n can_v easy_o be_v dilate_v but_o will_v require_v some_o force_n great_a than_o can_v be_v supply_v by_o a_o inconsiderable_a pressure_n of_o blood_n faint_o intrude_v by_o almost_o nothing_o at_o all_o but_o the_o lung_n be_v almost_o in_o a_o continual_a contraction_n in_o respect_n of_o the_o sanguiferous_a vessel_n and_o consequent_o squeeze_v out_o the_o blood_n contain_v in_o they_o help_v to_o dilate_v and_o extend_v the_o left_a cavity_n of_o the_o heart_n and_o consequent_o the_o right_n that_o the_o dilation_n of_o the_o ventricles_n of_o the_o heart_n be_v only_o a_o contraction_n resolution_n or_o cessation_n from_o contraction_n be_v allow_v and_o agree_v upon_o to_o prove_v then_o that_o the_o venal_a blood_n can_v return_v with_o force_n sufficient_a to_o dilate_v the_o right_a ventricle_n of_o the_o heart_n nor_o be_v sufficient_o able_a due_o to_o extend_v the_o left_a in_o order_n to_o the_o next_o contraction_n by_o that_o force_n it_o receive_v from_o and_o be_v put_v into_o by_o the_o former_a contraction_n but_o be_v assist_v by_o the_o lung_n we_o may_v easy_o perceive_v for_o not_o only_o the_o blood_n in_o its_o vessel_n but_o even_o any_o liquor_n be_v force_v through_o pipe_n who_o cavity_n increase_v the_o further_o they_o run_v from_o their_o narrow_a and_o small_a original_a always_o move_v with_o less_o force_n the_o far_o it_o go_v so_o that_o although_o in_o every_o systole_n the_o blood_n shall_v be_v force_v forward_o from_o the_o left_a ventricle_n by_o a_o successive_a pressure_n of_o subsequent_a matter_n and_o the_o motion_n shall_v be_v strong_a enough_o to_o make_v it_o circulate_v brisk_o through_o the_o narrow_a and_o capillary_a twig_n of_o the_o artery_n yet_o when_o it_o come_v into_o the_o vein_n it_o will_v move_v much_o more_o slow_a and_o by_o that_o time_n it_o come_v to_o the_o heart_n again_o will_v want_v force_n sufficient_a to_o dilate_v the_o right_a ventricle_n and_o the_o right_a ventricle_n be_v not_o due_o dilate_v so_o little_a blood_n will_v be_v squeeze_v into_o the_o lung_n that_o the_o left_a will_v want_v a_o supply_n of_o blood_n to_o dilate_v it_o and_o consequent_o the_o pressure_n of_o blood_n through_o the_o aorta_fw-mi and_o vena_fw-la cava_fw-la will_v be_v so_o weak_a that_o the_o next_o dilation_n of_o the_o right_a ventricle_n will_v be_v weak_a than_o the_o former_a and_o so_o circulation_n will_v gradual_o decrease_v but_o that_o weak_a motion_n of_o the_o blood_n into_o the_o right_a ventricle_n be_v increase_v by_o the_o force_n of_o subsequent_a matter_n from_o the_o left_a the_o motion_n of_o the_o blood_n into_o the_o lung_n be_v consequent_o more_o plentiful_a and_o as_o it_o pass_v through_o they_o be_v violent_o force_v into_o the_o left_a and_o so_o on_o and_o by_o that_o mean_n as_o i_o say_v before_o the_o lung_n distend_v the_o leave_v immediate_o and_o consequent_o the_o right_a mediate_o that_o the_o motion_n of_o the_o blood_n be_v thus_o weaken_a by_o so_o long_a a_o course_n in_o the_o vein_n be_v further_o evince_v if_o a_o vein_n and_o artery_n be_v open_v at_o once_o for_o the_o blood_n run_v out_o of_o the_o artery_n much_o more_o forcible_o and_o indeed_o it_o will_v be_v reasonable_a to_o think_v it_o so_o though_o it_o be_v not_o manifest_v by_o so_o plain_a a_o experiment_n for_o if_o water_n in_o a_o cistern_n be_v put_v into_o a_o violent_a motion_n at_o one_o end_n the_o further_a it_o run_v along_o the_o less_o violent_a be_v the_o force_n of_o it_o and_o it_o be_v further_a evident_a that_o the_o motion_n of_o
the_o lung_n do_v it_o assist_v the_o dilation_n of_o the_o heart_n as_o i_o have_v show_v by_o stop_v the_o breath_n of_o any_o animal_n which_o for_o want_v of_o free_a circulation_n present_o die_v and_o not_o because_o the_o flame_n of_o the_o blood_n be_v by_o that_o mean_v extinguish_v for_o as_o long_o as_o the_o lung_n due_o perform_v respiration_n and_o the_o heart_n violent_o contract_v and_o drive_v the_o blood_n contain_v in_o its_o ventricles_n forcible_o out_o that_o motion_n of_o the_o blood_n be_v by_o a_o continue_a wave_a pressure_n decrease_v be_v enable_v by_o the_o assistance_n of_o the_o motion_n of_o the_o lung_n to_o dilate_v the_o ventricles_n of_o the_o heart_n with_o a_o sufficient_a quantity_n of_o blood_n to_o be_v force_v out_o the_o next_o contraction_n but_o as_o soon_o as_o the_o lung_n cease_v to_o assist_v the_o languid_a motion_n of_o the_o blood_n in_o dilate_v the_o ventricles_n it_o be_v not_o only_o less_o plentiful_o force_v successive_o thus_o 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