figure_n now_o though_o the_o comet_n appearance_n be_v this_o way_n cause_v and_o so_o a_o man_n may_v conceive_v the_o globous_a body_n will_v in_o a_o little_a time_n by_o so_o copious_a a_o emanation_n be_v consume_v yet_o i_o do_v not_o believe_v that_o it_o do_v in_o a_o short_a time_n waste_v and_o disperse_v the_o whole_a ball_n nor_o can_v i_o conceive_v that_o the_o disappear_v of_o those_o blaze_a body_n towards_o the_o latter_a end_n do_v depend_v upon_o their_o dissolution_n though_o possible_o that_o may_v somewhat_o diminish_v they_o but_o that_o rather_o be_v to_o be_v ascribe_v to_o their_o distance_n and_o position_n in_o respect_n of_o we_o though_o this_o i_o remember_v i_o observe_v very_o manifest_o in_o that_o of_o 1664._o that_o the_o body_n towards_o the_o latter_a end_n of_o its_o appear_v be_v very_o much_o less_o in_o proportion_n to_o the_o radiation_n about_o it_o than_o it_o seem_v to_o be_v at_o the_o beginning_n but_o whether_o that_o may_v not_o be_v partly_o ascribe_v to_o the_o great_a distance_n it_o then_o be_v from_o we_o and_o the_o turn_n of_o the_o head_n pretty_a near_o towards_o we_o and_o thence_o the_o spread_a of_o the_o tail_n appear_v beyond_o it_o may_v add_v to_o the_o breadth_n of_o the_o radiation_n about_o the_o nucleus_n i_o will_v not_o positive_o determine_v now_o though_o for_o explication_n sake_n i_o have_v compare_v the_o part_n separate_v from_o the_o body_n of_o the_o comet_n to_o blaze_a granade_n or_o fire-ball_n yet_o i_o will_v not_o be_v understand_v to_o suppose_v these_o part_n so_o separate_v to_o be_v of_o any_o very_a large_a bulk_n for_o i_o see_v no_o necessity_n to_o suppose_v they_o big_a than_o the_o atom_n of_o smoke_n or_o the_o particle_n of_o any_o other_o steam_a body_n or_o than_o the_o part_n of_o the_o air_n which_o make_v the_o body_n of_o it_o appear_v thick_a and_o hazy_a nor_o do_v i_o believe_v that_o all_o the_o light_n of_o the_o star_n head_n and_o blaze_n do_v depend_v only_o upon_o the_o shine_a of_o the_o dissolve_v body_n and_o particle_n thereof_o but_o i_o do_v suppose_v that_o it_o do_v proceed_v both_o from_o the_o reflection_n of_o the_o sunbeam_n from_o those_o part_n and_o also_o from_o a_o innate_a and_o momentaneous_a light_n produce_v by_o the_o action_n of_o dissolution_n wrought_v on_o the_o part_n by_o the_o encompass_v aether_n it_o may_v possible_o seem_v very_o difficult_a to_o suppose_v that_o the_o dissolution_n of_o the_o part_n of_o the_o nucleus_n by_o the_o encompass_v aether_n shall_v cause_v or_o impress_v so_o violent_a a_o motion_n into_o the_o separate_a part_n as_o to_o make_v they_o depart_v from_o it_o to_o the_o space_n of_o four_o or_o five_o diameter_n before_o it_o be_v overpower_v by_o the_o power_n of_o levitation_n from_o the_o body_n of_o the_o sun_n and_o so_o deflect_v into_o a_o parabolical_a line_n upward_o it_o may_v likewise_o seem_v strange_a to_o suppose_v that_o the_o aether_n shall_v have_v such_o power_n in_o it_o as_o first_o to_o dissolve_v a_o body_n into_o itself_o and_o second_o to_o cause_v a_o shine_a and_o three_o to_o cause_v a_o levitation_n of_o the_o dissolve_a part_n upward_o whereas_o i_o suppose_v before_o and_o i_o think_v it_o be_v very_o manifest_a that_o they_o cause_v a_o gravitation_n downward_o towards_o the_o centre_n of_o the_o sun_n but_o to_o these_o for_o explication_n i_o answer_v that_o we_o need_v not_o go_v far_o for_o instance_n to_o make_v these_o thing_n probable_a the_o atmosphere_n about_o the_o earth_n as_o i_o have_v former_o mention_v in_o my_o micrographia_fw-la i_o take_v to_o be_v nothing_o else_o but_o the_o dissolution_n of_o the_o part_n of_o the_o earth_n into_o the_o encompass_v aether_n for_o the_o proof_n of_o which_o i_o can_v bring_v many_o argument_n be_v it_o here_o a_o proper_a place_n by_o which_o i_o can_v most_o evident_o demonstrate_v the_o thing_n to_o be_v as_o i_o have_v assert_v it_o be_v here_o evident_a that_o this_o aether_n do_v take_v up_o the_o particle_n of_o body_n to_o a_o very_a great_a distance_n from_o the_o surface_n from_o which_o they_o be_v separate_v and_o it_o do_v not_o only_o raise_v they_o but_o sustein_v they_o at_o those_o height_n nor_o be_v this_o peculiar_a only_o to_o the_o aether_n when_o a_o menstruum_fw-la but_o to_o all_o dissolve_v menstruum_n in_o general_n as_o to_o give_v one_o instance_n in_o stead_n of_o many_o we_o find_v that_o gold_n the_o heavy_a of_o all_o terrestrial_a body_n we_o yet_o know_v be_v dissolve_v by_o aqua_fw-la regis_fw-la be_v take_v up_o into_o it_o and_o keep_v suspend_v therein_o though_o the_o part_n of_o the_o gold_n be_v fifteen_o time_n heavy_a than_o the_o part_n of_o the_o aqua_fw-la regis_fw-la so_o pit-coal_n though_o very_o heavy_a be_v yet_o take_v up_o into_o the_o air_n and_o keep_v suspend_v therein_o though_o it_o will_v be_v find_v to_o be_v some_o thousand_o of_o time_n more_o ponderous_a than_o the_o menstruum_fw-la of_o the_o air_n that_o keep_v it_o suspend_v many_o reason_n i_o can_v produce_v to_o show_v the_o great_a power_n of_o the_o aether_n and_o the_o universality_n of_o its_o activity_n almost_o in_o all_o sensible_a motion_n but_o reserve_v they_o for_o another_o discourse_n hereafter_o i_o shall_v at_o present_a only_o mention_v those_o supposition_n which_o seem_v to_o have_v the_o great_a difficulty_n in_o this_o theory_n viz._n how_o the_o dissolution_n of_o the_o part_n of_o the_o star_n by_o the_o encompass_v aether_n shall_v cause_v light_n and_o second_o how_o it_o shall_v cause_v a_o actual_a levitation_n of_o the_o dissolve_v particle_n upward_o for_o the_o explication_n of_o these_o two_o difficulty_n i_o must_v at_o present_a crave_v favour_n to_o explain_v they_o by_o example_n take_v from_o operation_n of_o nature_n in_o the_o atmosphere_n wherein_o we_o live_v very_o similar_v and_o analogous_a to_o they_o first_o for_o the_o production_n of_o light_n we_o find_v that_o the_o air_n encompass_v the_o steam_n of_o body_n prepare_v by_o heat_n or_o otherwise_o and_o make_v fit_a for_o dissolution_n do_v so_o operate_v upon_o they_o as_o to_o make_v they_o fly_v and_o part_v asunder_o with_o a_o very_a impetuous_a motion_n insomuch_o that_o the_o small_a particle_n or_o atom_n of_o the_o dissolve_a body_n do_v not_o only_o leave_v one_o another_o but_o depart_v and_o dart_v out_o with_o so_o great_a a_o impetuosity_n as_o to_o drive_v off_o all_o the_o encompass_v air_n from_o their_o centre_n from_o whence_o they_o fly_v and_o this_o i_o take_v to_o be_v the_o cause_n not_o only_o of_o their_o light_n but_o also_o of_o their_o levity_n upward_o this_o may_v be_v see_v very_o plain_o by_o the_o small_a part_n of_o crackle_v char-coal_n which_o upon_o the_o blow_v they_o with_o bellows_o and_o so_o crowd_v a_o great_a quantity_n of_o the_o fresh_a menstruum_fw-la on_o they_o fly_v and_o dart_v asunder_o with_o great_a celerity_n and_o noise_n but_o be_v abundant_o more_o evident_a in_o the_o kindle_v of_o gunpowder_n where_o the_o impetuosity_n be_v so_o very_o great_a as_o to_o drive_v away_o not_o only_o all_o the_o encompass_v air_n but_o all_o other_o body_n though_o never_o so_o solid_a that_o hinder_v its_o expansion_n in_o the_o perform_n of_o which_o operation_n the_o aether_n have_v a_o great_a share_n as_o i_o may_v hereafter_o show_v it_o be_v very_o probable_a that_o the_o aether_n in_o the_o same_o manner_n dissolve_v the_o particle_n of_o the_o star_n cause_v the_o atom_n thereof_o to_o fly_v asunder_o with_o so_o great_a a_o impetuosity_n as_o to_o leave_v a_o vacuity_n even_o of_o the_o part_n of_o the_o aether_n which_o fly_v asunder_o do_v not_o only_a cause_n light_n by_o impress_v on_o the_o aether_n a_o stroke_n or_o pulse_n which_o propagate_v every_o way_n in_o orbem_fw-la but_o make_v such_o a_o agitation_n of_o the_o the_o aether_n as_o cause_v a_o rarefaction_n in_o the_o part_n thereof_o whilst_o the_o part_n that_o be_v once_o actual_o separate_v by_o continual_a rebound_v one_o against_o another_o before_o they_o come_v to_o be_v at_o rest_n and_o quiet_o to_o touch_v each_o other_o prolong_v that_o first_o separation_n or_o vacuity_n between_o they_o this_o explication_n though_o it_o be_v somewhat_o difficult_a yet_o i_o hope_v it_o be_v intelligible_a and_o may_v be_v with_o probability_n enough_o suppose_v to_o be_v the_o true_a cause_n of_o the_o appearance_n whilst_o there_o be_v nothing_o therein_o suppose_v which_o be_v not_o manifest_o the_o method_n of_o nature_n in_o other_o operation_n and_o though_o the_o supposition_n even_o of_o the_o aether_n may_v seem_v to_o be_v a_o chimaera_n and_o groundless_a yet_o have_v i_o now_o time_n i_o can_v by_o many_o very_a sensible_a and_o undeniable_a experiment_n prove_v the_o existence_n and_o reality_n thereof_o and_o
heat_n 61._o it_o fire_v gunpowder_n first_o warm_v 62._o and_o white_a paper_n hold_v over_o coal_n other_o trial_n propound_v but_o refuse_v 63._o some_o experiment_n make_v on_o the_o phosphoros_n baldwini_n in_o vacuo_fw-la and_o in_o the_o open_a air_n 64._o preserve_v in_o vacuo_fw-la but_o destroy_v in_o air._n 65_o 66._o monsieur_n gallet_n letter_n to_o monsieur_n cassini_n acquaint_v he_o with_o his_o apparatus_fw-la for_o observe_v ☿_o in_o ☉_o 67_o 68_o his_o observation_n of_o four_o spot_n in_o ☉_o 69._o the_o particular_n observe_v 70.71_o 72._o monsieur_n cassini_n reflection_n on_o these_o observation_n 73_o 74._o mr._n hally_n letter_n to_o sir_n ionas_n moor_n contain_v a_o account_n of_o his_o observation_n of_o ☿_o sub_fw-la sole_a three_o southern_a star_n the_o two_o nubeculae_fw-la etc._n etc._n 75_o 76_o 77._o mr._n cassini_n far_a discovery_n about_o the_o diurnal_a motion_n and_o several_a new_a appearance_n in_o ♃_o 78_o 79_o 80._o a_o second_o discourse_v call_v microscopium_n or_o some_o new_a discovery_n with_o microscope_n in_o a_o letter_n of_o mr._n leeuwenhoeck_n 81.82_o a_o confirmation_n of_o some_o of_o they_o by_o observation_n here_o 83._o mr._n leeuwenhoeck_n second_o letter_n contain_v observation_n of_o the_o globule_n of_o blood_n milk_n phlegm_n gum_n first_o dissolve_v then_o precipitate_v out_o of_o the_o spirit_n of_o wine_n eel_n a_o thousand_o time_n thin_a than_o a_o hair_n 84_o 85_o 86_o 87_o 88_o 89._o the_o way_n how_o these_o discovery_n be_v make_v here_o 1._o by_o hold_v the_o liquor_n in_o small_a pipe_n how_o fill_v how_o make_v the_o lamp_n pipe_n oil_n manner_n material_n for_o make_v they_o describe_v 89_o 90._o muscovy-glass_n use_v instead_o of_o these_o pipe_n and_o how_o the_o microscope_n be_v fit_v for_o this_o purpose_n 91._o what_o light_a convenient_a surface_v of_o body_n not_o perfect_o fluid_v apt_a to_o delude_v a_o observer_n 92._o plate_n remove_v that_o delude_a cause_n and_o what_o far_a use_n of_o they_o 93._o how_o to_o find_v the_o figure_n and_o texture_n of_o animal_n and_o vegetable_a part_n instance_n in_o a_o ligament_n of_o beef_n 94._o the_o figure_n of_o muscle_n hint_v and_o a_o instrument_n stretch_v they_o before_o the_o glass_n describe_v 95._o a_o description_n of_o the_o microscope_n use_v 1._o of_o the_o single_a microscope_n and_o its_o advantage_n and_o difficulty_n 96._o another_o sort_n more_o easy_a describe_v and_o the_o way_n how_o to_o make_v and_o use_v it_o explain_v 97._o cause_n that_o vary_v the_o distance_n of_o object_n from_o the_o globule_n the_o use_n of_o selenites_n and_o looking-glass-plate_n for_o hold_v the_o liquor_n a_o microscope_n of_o one_o single_a refraction_n 98._o the_o only_a inconvenience_n of_o they_o hint_v how_o prevent_v by_o double_a microscope_n where_o these_o be_v make_v 99_o the_o double_a microscope_n and_o its_o part_n use_n and_o advantage_n describe_v 100_o the_o benefit_n of_o a_o dark_a room_n and_o appropriate_v light_n and_o a_o digression_n in_o answer_n to_o p._n cherubin_n accusation_n 101._o some_o observation_n make_v with_o this_o microscope_n hint_v animalcules_n in_o the_o steep_v of_o other_o grain_n beside_o pepper_n their_o smallness_n estimate_v and_o compare_v to_o a_o whale_n muscular_a fabric_n hint_v milk_n blood_n fat_a sugar_n alum_n etc._n etc._n view_v 102_o 103._o mr._n young_n letter_n of_o one_o who_o try_v to_o cure_v a_o colic_n by_o leaden_a pill_n slip_v one_o into_o his_o lung_n grievous_a symptom_n ensue_v 105._o help_v of_o skilful_a physician_n in_o vain_a attempt_v and_o particular_o of_o dr._n mayow_o of_o suspend_v with_o the_o head_n downward_o though_o in_o the_o interim_n he_o marry_v and_o have_v child_n yet_o it_o kill_v he_o 106_o 107._o his_o body_n dissect_v and_o remarkable_n take_v notice_n of_o and_o their_o cause_n explain_v by_o mr._n young_a from_o 107._o to_o 112._o cometa_fw-la or_o remark_n about_o comet_n on_o saturday_n morning_n april_n 21._o 1677._o i_o first_o see_v the_o comet_n of_o which_o i_o have_v be_v advertise_v the_o day_n before_o it_o appear_v in_o the_o sign_n taurus_n between_o the_o base_a of_o the_o triangle_n and_o the_o unformed_a star_n in_o the_o cloud_n of_o aries_n dignify_v by_o p._n pardies_n with_o the_o figure_n of_o the_o flower-de-luce_n the_o head_n of_o it_o be_v in_o a_o right_a line_n with_o the_o heart_n of_o cassiopea_n and_o alamak_n or_o the_o south_n foot_n of_o andromeda_n and_o as_o near_o as_o i_o can_v judge_v by_o my_o naked_a eye_n have_v no_o instrument_n or_o help_n by_o i_o it_o be_v ⅚_n of_o the_o distance_n between_o the_o foot_n and_o the_o girdle_n of_o andromeda_n distant_a from_o the_o say_v alamak_n towards_o the_o south_n it_o be_v tail_n sometime_o as_o the_o air_n be_v clear_a and_o dark_a extend_v about_o three_o quarter_n of_o its_o distance_n from_o the_o aforesaid_a alamak_n and_o point_v direct_o at_o the_o star_n in_o the_o nose_n of_o cassiopea_n of_o the_o four_o magnitude_n and_o consequent_o the_o head_n of_o the_o comet_n point_v not_o direct_o at_o the_o sun_n the_o sun_n then_o be_v about_o the_o eleven_o degree_n of_o taurus_n but_o rather_o towards_o the_o fourteen_o degree_n of_o the_o same_o sign_n it_o be_v appearance_n be_v very_o small_a and_o slender_a and_o as_o people_n common_o guess_v about_o two_o yard_n long_o and_o the_o head_n about_o the_o bigness_n of_o a_o star_n of_o the_o first_o magnitude_n but_o of_o a_o much_o faint_a and_o dull_a light_n it_o be_v blaze_n about_o three_o of_o the_o clock_n seem_v to_o rise_v straight_o upward_o before_o that_o about_o half_a a_o hour_n after_o two_o it_o lean_v a_o little_a eastward_n or_o towards_o the_o right_a hand_n and_o after_o three_o as_o it_o rise_v high_o incline_v towards_o the_o left_a side_n or_o westward_n the_o head_n to_o the_o naked_a eye_n be_v bright_a than_o the_o blaze_n and_o seem_v to_o be_v somewhat_o big_a than_o that_o part_n of_o it_o which_o immediate_o join_v to_o the_o head_n but_o those_o part_n of_o it_o which_o be_v far_a distant_a be_v of_o a_o much_o great_a breadth_n spread_v wide_o and_o wide_o as_o they_o be_v more_o remote_a from_o the_o head_n and_o in_o the_o same_o proportion_n also_o grow_v faint_a and_o faint_a in_o their_o light_n especial_o towards_o the_o outside_n but_o the_o middle_a part_n or_o medulla_n appear_v much_o long_o and_o the_o brightness_n much_o great_a which_o make_v the_o whole_a blaze_n to_o seem_v to_o taper_n or_o be_v point_v towards_o the_o top_n the_o length_n of_o the_o blaze_n appear_v sometime_o short_a and_o sometime_o long_o by_o several_a vicissitude_n and_o as_o the_o daybreak_n or_o dawn_v increase_v so_o the_o blaze_n shorten_v and_o especial_o towards_o the_o side_n near_o the_o top_n and_o short_o after_o before_o the_o sun_n rise_v disappear_v but_o notwithstanding_o this_o shorten_n and_o lengthen_v of_o the_o blaze_n i_o can_v not_o perceive_v any_o kind_n of_o motion_n in_o the_o part_n of_o it_o such_o as_o be_v observable_a in_o flame_n smoke_n or_o other_o steam_n rise_v from_o a_o burn_a or_o hot_a body_n but_o the_o same_o part_n of_o the_o blaze_n seem_v to_o appear_v and_o disappear_v in_o their_o proper_a place_n as_o if_o they_o have_v be_v fix_v and_o a_o solid_a body_n the_o first_o figure_n i_o have_v here_o annex_v will_n with_o some_o short_a explication_n represent_v the_o appearance_n of_o it_o to_o the_o eye_n more_o plain_o than_o by_o a_o multitude_n of_o word_n without_o it_o it_o be_v possible_a to_o express_v a_o represent_v the_o head_n of_o the_o comet_n the_o middle_a of_o which_o appear_v bright_a than_o any_o other_o part_n about_o which_o be_v a_o hazy_a light_n somewhat_o like_o the_o shine_a of_o a_o star_n through_o a_o thin_a cloud_n the_o low_a part_n of_o which_o be_v pretty_a round_o and_o define_v b_o the_o neck_n of_o it_o which_o seem_v to_o the_o naked_a eye_n of_o less_o diameter_n and_o less_o bright_a than_o the_o head_n but_o through_o a_o six-foot_n glass_n as_o i_o shall_v mention_v by_o and_o by_o it_o appear_v big_a though_o not_o so_o bright_a the_o middle_n of_o this_o be_v very_o bright_a and_o seem_v to_o issue_v from_o the_o nucleus_n or_o star_n in_o the_o middle_n of_o the_o head_n c_o the_o brushy_a part_n which_o be_v faint_a and_o pale_a towards_o the_o side_n especial_o near_o the_o top_n which_o make_v the_o whole_a seem_v to_o taper_n and_o resemble_v the_o figure_n here_o express_v observe_v it_o with_o telescope_n one_o of_o which_o be_v fifteen_o foot_n and_o the_o other_o six_o foot_n long_o i_o find_v the_o shape_n of_o it_o much_o like_o this_o which_o i_o have_v represent_v in_o the_o second_o figure_n it_o have_v a_o pretty_a bright_a star_n if_o i_o may_v so_o call_v it_o near_o the_o middle_n
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and_o more_o ready_o and_o scientifical_o find_v a_o cure_n and_o prevention_n of_o those_o inconvenience_n which_o he_o that_o be_v ignorant_a of_o can_v but_o hood-winked_n grope_v after_o and_o at_o best_a can_v but_o hope_v possible_o after_o long_o puzzle_v himself_o in_o vain_a attempt_n and_o blind_a trial_n nothing_o to_o the_o purpose_n he_o may_v at_o length_n stumble_v upon_o that_o which_o have_v he_o be_v enlighten_v by_o the_o true_a theory_n he_o will_v have_v ready_o go_v to_o at_o the_o first_o glance_n i_o can_v have_v further_o expatiate_v into_o the_o contemplation_n of_o this_o most_o admirable_a phenomenon_n of_o flame_n produce_v heat_n and_o light_n the_o two_o most_o spirituous_a and_o most_o potent_a agent_n in_o nature_n and_o the_o way_n of_o intend_v and_o diminish_v they_o and_o the_o use_n that_o may_v be_v make_v of_o they_o but_o that_o it_o be_v not_o my_o present_a design_n to_o annex_v a_o discourse_n on_o those_o subject_n which_o do_v more_o 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the_o best_a of_o all_o be_v quicksilver_n because_o it_o do_v not_o with_o keep_v evaporate_v at_o all_o sensible_o which_o i_o have_v careful_o observe_v for_o these_o fifteen_o year_n last_o pass_v nor_o do_v it_o grow_v thick_a or_o foul_a by_o the_o alteration_n of_o the_o air_n nor_o do_v i_o find_v it_o sensible_o alter_v by_o the_o heat_n and_o cold_a at_o lest_o not_o comparable_a to_o the_o great_a change_n which_o other_o liquor_n suffer_v by_o the_o alteration_n of_o those_o quality_n it_o be_v a_o excellent_a material_a for_o measure_v time_n in_o a_o stand_a machine_n and_o there_o may_v be_v hundred_o of_o way_n contrive_v to_o make_v it_o measure_v the_o space_n thereof_o as_o accurate_o as_o a_o pendulum_n and_o i_o have_v many_o time_n admire_v that_o tycho_n brahe_n who_o be_v otherwise_o so_o curious_a and_o exact_a in_o the_o contrivance_n and_o make_v of_o his_o engine_n and_o instrument_n be_v yet_o so_o defective_a in_o his_o contrivance_n of_o measure_v time_n by_o quicksilver_n when_o there_o be_v so_o many_o obvious_a and_o easy_a way_n of_o do_v it_o as_o he_o seem_v to_o complain_v in_o his_o work_n i_o have_v make_v trial_n of_o several_a with_o very_o good_a success_n and_o find_v some_o of_o they_o even_o beyond_o expectation_n certain_a of_o which_o i_o may_v hereafter_o upon_o a_o other_o occasion_n add_v the_o description_n when_o i_o publish_v the_o various_a way_n of_o make_v exact_a time-keeper_n or_o watch_n in_o the_o mean_a time_n be_v now_o speak_v of_o time-keeper_n for_o variety_n sake_n i_o shall_v mention_v a_o new_a principle_n for_o watch_n this_o be_v a_o way_n of_o regulate_v both_o stand_a watch_n and_o movable_a watch_n either_o for_o the_o sea_n or_o the_o pocket_n which_o some_o ten_o or_o twelve_o year_n fince_n i_o show_v the_o royal_a society_n when_o i_o show_v they_o my_o contrivance_n of_o the_o circular_a pendulum_n which_o be_v since_o publish_v by_o monsieur_n hugenius_n which_o be_v also_o mention_v in_o the_o history_n of_o the_o say_a society_n p._n 247._o lin_v 20._o this_o be_v by_o a_o fly_n move_v circular_o instead_o of_o a_o balance_n who_o motion_n be_v regulate_v by_o weight_n fly_v further_a and_o further_o from_o the_o centre_n according_a as_o the_o strength_n of_o the_o spring_n of_o the_o watch_n have_v more_o and_o more_o force_n upon_o its_o arbour_n the_o weight_n be_v regulate_v from_o fly_v out_o further_a than_o they_o ought_v to_o do_v by_o the_o contrivance_n of_o a_o spiral_n spring_n draw_v both_o the_o say_a weight_n to_o the_o centre_n of_o the_o motion_n or_o fly_v in_o the_o same_o proportion_n as_o i_o then_o demonstrate_v gravity_n to_o attract_v the_o weight_n of_o a_o circular_a pendulum_n move_v in_o a_o parabolical_a superficies_n towards_o the_o centre_n or_o axis_n of_o its_o motion_n the_o weight_n be_v so_o contrive_v as_o always_o to_o counterpoise_v each_o other_o the_o skeleton_n of_o this_o fly_v you_o have_v represent_v in_o the_o figure_n the_o particular_a explanation_n of_o the_o part_n and_o the_o geometrical_a demonstration_n of_o the_o principle_n both_o of_o the_o spring_n and_o of_o the_o fly_n from_o the_o centre_n i_o shall_v explain_v in_o the_o theory_n of_o spring_n and_o in_o the_o description_n of_o time-keeper_n and_o watch_n 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d arist_n quaest_n mechan_n a_o observation_n about_o the_o seed_n of_o moss_n since_o the_o publish_n of_o my_o micrography_n i_o have_v meet_v with_o a_o observation_n which_o though_o it_o be_v of_o one_o of_o the_o small_a compound_n body_n i_o have_v hitherto_o take_v notice_n of_o yet_o do_v it_o afford_v a_o hint_n of_o very_a great_a concern_v in_o natural_a philosophy_n and_o it_o do_v seem_v to_o make_v clear_a the_o cause_n of_o a_o phaenomenon_n that_o have_v appear_v dubious_a not_o only_o to_o i_o but_o to_o many_o other_o more_o know_v naturalist_n i_o have_v often_o doubt_v i_o confess_v whether_o moss_n mushroom_n and_o several_a other_o small_a plant_n which_o the_o earth_n seem_v to_o produce_v 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d 〈◊〉_d be_v the_o offspring_n of_o a_o seed_n or_o grain_n and_o i_o have_v be_v apt_a to_o believe_v that_o they_o be_v rather_o a_o secondary_a production_n of_o nature_n be_v somewhat_o the_o more_o incline_v to_o that_o opinion_n because_o have_v former_o examine_v the_o small_a knot_n or_o seed-cod_n of_o moss_n with_o a_o single_a microscope_n i_o can_v not_o perceive_v any_o thing_n in_o they_o that_o i_o can_v imagine_v to_o be_v seed_n at_o least_o not_o so_o great_a a_o quantity_n as_o seem_v necessary_a to_o maintain_v so_o numerous_a a_o progeny_n as_o be_v every_o where_o to_o be_v find_v of_o it_o that_o which_o then_o come_v out_o of_o they_o seem_v to_o be_v rather_o a_o pulp_n or_o pith_n than_o any_o thing_n like_o the_o seed_n in_o other_o similar_v cod_n but_o be_v since_o somewhat_o more_o inquisitive_a i_o do_v examine_v several_a of_o the_o abovementioned_a knob_n or_o seed-vessel_n and_o find_v that_o there_o be_v seed_n in_o they_o no_o less_o wonderful_a for_o the_o greatness_n of_o number_n than_o the_o smallness_n of_o bulk_n take_v then_o some_o of_o the_o ripe_a and_o brown_a or_o red_a one_o of_o they_o and_o press_v they_o pretty_a hard_a i_o find_v that_o there_o be_v a_o small_a dust_n go_v out_o of_o they_o which_o seem_v to_o vanish_v into_o the_o air._n press_v and_o squeeze_v other_o of_o these_o upon_o a_o black-plate_n and_o examine_v the_o powder_n with_o a_o microscope_n i_o find_v it_o to_o be_v a_o great_a heap_n of_o exceed_v small_a seed_n globular_a and_o pretty_a transparent_a it_o be_v the_o small_a i_o confess_v i_o have_v yet_o see_v and_o it_o may_v be_v that_o have_v hitherto_o be_v discover_v and_o unless_o that_o be_v a_o plant_n which_o i_o discover_v grow_v on_o the_o blighted_a leaf_n of_o rose_n and_o that_o those_o small_a body_n be_v seed_n vessel_n or_o unless_o those_o knob_n i_o have_v discover_v on_o the_o top_n of_o mould_n be_v the_o like_a i_o can_v present_o imagine_v where_o there_o shall_v be_v find_v a_o small_a for_o i_o find_v that_o there_o will_v need_v no_o less_o than_o thirty_o six_o hundred_o of_o they_o to_o be_v lay_v one_o by_o another_o in_o a_o line_n to_o make_v the_o length_n of_o a_o inch_n and_o to_o cover_v the_o superficies_n of_o a_o inch-square_a there_o will_v need_v no_o less_o than_o nine_o hundred_o and_o threescore_o thousand_o beside_o twelve_o million_o of_o single_a seed_n if_o lay_v quadrangular_o but_o if_o lay_v triangular_o there_o will_v need_v no_o less_o than_o two_o hundred_o and_o fourscore_o thousand_o beside_o seventeen_o million_o of_o single_a grain_n and_o the_o number_n in_o a_o grain_n weight_n of_o they_o can_v be_v less_o than_o one_o thousand_o three_o hundred_o eighty_o two_o million_o and_o four_o hundred_o thousand_o single_a grain_n about_o eighty_o of_o these_o square_a superficies_n of_o seed_n be_v lay_v one_o upon_o another_o in_o the_o trigonal_a order_n make_v as_o near_o as_o i_o can_v guess_v the_o thickness_n of_o a_o piece_n of_o fine_a paper_n a_o square_a inch_n of_o which_o weigh_v a_o grain_n and_o though_o this_o may_v seem_v a_o most_o incredible_a narration_n yet_o i_o will_v desire_v such_o as_o be_v apt_a to_o be_v too_o censorious_a to_o take_v the_o pain_n to_o gather_v a_o few_o of_o these_o seed-vessel_n and_o examine_v they_o as_o i_o have_v do_v and_o then_o speak_v what_o they_o find_v and_o believe_v no_o more_o than_o their_o own_o sense_n and_o reason_n will_v inform_v they_o and_o they_o may_v easy_o see_v that_o what_o i_o have_v assert_v will_v be_v rather_o short_a of_o than_o exceed_v the_o real_a number_n now_o if_o this_o shell_n of_o the_o seed_n be_v thus_o small_a how_o much_o small_a must_n needs_o be_v the_o rudiment_n of_o the_o plant_n that_o lie_v enclose_v within_o it_o and_o how_o easy_o may_v such_o seed_n be_v draw_v up_o into_o the_o air_n and_o carry_v from_o place_n and_o place_n even_o to_o the_o top_n of_o the_o high_a tower_n or_o to_o place_n most_o remote_a and_o be_v sow_v by_o the_o pass_a air_n or_o fall_a drop_n of_o rain_n on_o the_o bough_n or_o branch_n of_o tree_n side_n and_o top_n of_o wall_n house_n or_o steeple_n and_o it_o be_v not_o in_o the_o art_n of_o man_n to_o leave_v earth_n expose_v to_o the_o common_a air_n and_o to_o exclude_v the_o entrance_n or_o prevent_v the_o sow_v of_o these_o imperceptible_a seed_n and_o therefore_o it_o be_v not_o to_o be_v wonder_v at_o that_o if_o any_o earth_n though_o never_o so_o pure_a be_v expose_v to_o the_o air_n and_o rain_n though_o at_o the_o top_n of_o a_o steeple_n it_o will_v produce_v moss_n further_a inquiry_n may_v possible_o instruct_v we_o that_o there_o
contrary_a if_o i_o can_v have_v see_v any_o comet_n to_o have_v cover_v any_o star_n in_o its_o way_n it_o will_v have_v afford_v a_o very_a circumstantial_a information_n especial_o if_o for_o this_o purpose_n it_o have_v be_v take_v notice_n of_o with_o a_o good_a telescope_n what_o the_o density_n of_o the_o innermost_a part_n of_o this_o earth_n we_o live_v on_o be_v none_o know_v for_o though_o we_o find_v the_o part_n on_o which_o we_o tread_v to_o be_v very_o compact_a and_o though_o by_o the_o industry_n of_o miner_n it_o have_v be_v prove_v so_o also_o to_o the_o depth_n of_o many_o hundred_o foot_n as_o georgius_n agricola_n relate_v and_o though_o it_o have_v be_v find_v so_o even_o to_o a_o great_a depth_n by_o the_o sounding_n of_o the_o bottom_n of_o the_o sea_n yet_o none_o can_v bring_v a_o undeniable_a proof_n that_o the_o same_o be_v so_o solid_a to_o 25_o mile_n deep_a much_o less_o that_o it_o be_v so_o to_o the_o centre_n if_o therefore_o the_o external_a shell_n of_o this_o globe_n be_v break_v and_o remove_v it_o be_v not_o impossible_a but_o that_o the_o middle_a part_n thereof_o may_v be_v of_o the_o same_o nature_n with_o the_o middle_a part_n of_o the_o comet_n body_n and_o that_o those_o part_n be_v the_o superficial_a part_n or_o shell_n remove_v may_v like_o these_o of_o comet_n expand_v themselves_o into_o the_o encompass_v aether_n nay_o we_o find_v that_o notwithstanding_o the_o compactedness_n of_o the_o superficial_a part_n of_o this_o earth_n yet_o the_o aether_n be_v able_a to_o take_v up_o into_o itself_o vast_a quantity_n of_o they_o and_o to_o keep_v they_o suspend_v some_o of_o they_o even_o to_o the_o height_n of_o many_o mile_n if_o any_o argument_n may_v be_v draw_v from_o the_o height_n or_o length_n of_o the_o dawn_n or_o crepusculum_fw-la and_o this_o notwithstanding_o the_o attraction_n of_o the_o earth_n in_o its_o perfect_a vigour_n or_o the_o gravitation_n of_o these_o part_n thus_o take_v up_o or_o their_o endeavour_n towards_o the_o centre_n of_o the_o earth_n how_o much_o more_o free_o then_o may_v we_o imagine_v the_o encompass_v aether_n to_o prey_n upon_o and_o take_v up_o into_o itself_o the_o internal_a part_n if_o they_o be_v of_o a_o loose_a and_o pervious_a texture_n and_o almost_o in_o a_o state_n of_o fluidity_n like_o a_o heap_n of_o sand_n or_o a_o vessel_n of_o alabaster-dust_n in_o boil_v and_o be_v not_o so_o firm_o unite_v by_o the_o bond_n of_o gravity_n and_o the_o vinculum_fw-la of_o petrifaction_n as_o we_o find_v the_o superficial_a part_n of_o the_o earth_n now_o be_v there_o be_v one_o argument_n to_o prove_v to_o we_o that_o there_o may_v be_v such_o a_o looseness_n of_o the_o internal_a part_n of_o the_o earth_n and_o that_o be_v that_o the_o magnetical_a virtue_n vary_v which_o virtue_n without_o controyersie_n diffuse_v through_o the_o whole_a body_n of_o the_o earth_n and_o which_o have_v a_o relation_n to_o the_o whole_a globe_n and_o to_o every_o magnetical_a part_n thereof_o for_o by_o observation_n it_o be_v find_v that_o the_o magnetical_a virtue_n act_n upon_o a_o needle_n without_o it_o as_o the_o magnetical_a virtue_n of_o a_o round_a loadstone_n do_v on_o a_o needle_n apply_v without_o that_o which_o as_o i_o may_v elsewhere_o show_v have_v a_o respect_n to_o the_o centre_n of_o the_o stone_n differ_v from_o all_o the_o respect_n that_o author_n have_v hitherto_o ascribe_v to_o it_o even_o of_o gilbert_n kepler_n kircher_n descartes_n and_o our_o countryman_n mr._n bond_n who_o i_o think_v be_v the_o first_o man_n that_o endeavour_v to_o reduce_v the_o variation_n observe_v by_o wright_n gellibrand_n coster_n etc._n etc._n into_o a_o theory_n and_o calculation_n now_o this_o magnetical_a virtue_n which_o may_v be_v call_v one_o emanation_n of_o the_o anima_fw-la mundi_fw-la as_o gravity_n may_v be_v call_v another_o be_v diffuse_v through_o every_o part_n of_o it_o and_o seem_v to_o be_v as_o it_o be_v tota_n in_o toto_fw-la &_o tota_fw-la in_o qualibet_fw-la parte_fw-la and_o to_o be_v more_o spiritual_a and_o to_o act_v more_o according_a to_o magical_a and_o mystical_a law_n than_o light_n sound_z or_o the_o like_a it_o give_v to_o every_o magnetical_a body_n and_o every_o piece_n of_o it_o though_o infinite_o divide_v the_o same_o propriety_n it_o have_v itself_o this_o magnetical_a virtue_n i_o say_v have_v such_o a_o relation_n and_o be_v force_v thus_o to_o vary_v it_o be_v very_o probable_a that_o the_o internal_a part_n to_o which_o it_o have_v a_o respect_n have_v a_o variation_n likewise_o and_o consequent_o that_o these_o internal_a part_n which_o be_v suppose_v general_o very_o dense_a compact_a and_o very_o close_o and_o solid_o unite_v may_v be_v notwithstanding_o more_o loose_a and_o ununited_a and_o movable_a from_o certain_a cause_n to_o proceed_v therefore_o i_o say_v that_o it_o seem_v very_o probable_a to_o i_o that_o the_o body_n of_o comet_n may_v be_v of_o the_o same_o nature_n and_o constitution_n with_o that_o of_o the_o internal_a part_n of_o the_o earth_n that_o these_o part_n may_v by_o the_o help_n of_o the_o aether_n be_v so_o agitate_a and_o blend_a together_o as_o to_o make_v they_o work_v upon_o and_o dissolve_v each_o other_o in_o the_o same_o manner_n as_o we_o have_v often_o have_v example_n of_o some_o of_o the_o part_n of_o the_o earth_n a_o late_a instance_n of_o which_o be_v at_o mongibel_n or_o aetna_n in_o sicily_n where_o the_o fire_n continue_v for_o a_o long_a time_n and_o produce_v very_o considerable_a effect_n that_o this_o internal_a agitation_n may_v confound_v the_o gravitating_a principle_n and_o so_o leave_v the_o part_n in_o a_o great_a freedom_n to_o be_v dissolve_v by_o the_o encompass_v aether_n which_o be_v the_o agent_n that_o set_v the_o other_o two_o at_o work_n to_o destroy_v each_o other_o that_o it_o may_v at_o length_n prey_n upon_o both_o and_o dissolve_v they_o both_o into_o itself_o and_o consequent_o 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persevere_fw-la exact_o in_o a_o straight_a line_n second_o that_o after_o it_o have_v pass_v its_o perige_n it_o accelerate_v its_o motion_n in_o proportion_n to_o tangent_n of_o equal_a angle_n three_o that_o it_o either_o be_v extinguish_v dissipate_v break_v in_o piece_n or_o burn_v out_o into_o ash_n four_o that_o it_o receive_v all_o its_o light_n from_o the_o sun_n five_o that_o if_o the_o blaze_n be_v not_o make_v by_o the_o beam_n of_o the_o sun_n pass_v through_o the_o head_n of_o the_o comet_n and_o so_o carry_v the_o part_n along_o with_o they_o the_o blaze_n will_v not_o be_v opposite_a to_o the_o sun_n sixthly_a that_o the_o cause_n of_o the_o bend_n of_o the_o blaze_n be_v the_o refraction_n of_o the_o sun_n ray_n in_o the_o body_n and_o their_o be_v bend_v by_o the_o aether_n as_o with_o a_o wind_n which_o be_v the_o opinion_n that_o the_o ingenious_a descartes_n follow_v also_o to_o these_o i_o can_v consent_v and_o i_o have_v many_o objection_n to_o several_a other_o 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light_n from_o the_o sun_n since_o if_o so_o it_o will_v follow_v that_o the_o nucleus_n in_o the_o head_n will_v have_v a_o dark_a shadow_n opposite_a to_o the_o sun_n the_o contrary_a of_o which_o have_v always_o be_v observe_v nor_o can_v i_o well_o understand_v that_o the_o sun_n beam_n be_v like_o a_o stream_n of_o water_n carrying_z the_o part_n of_o the_o comet_n along_o with_o they_o so_o as_o to_o make_v its_o blaze_n since_o no_o such_o effect_n be_v find_v of_o they_o here_o with_o we_o upon_o the_o earth_n nor_o how_o they_o shall_v come_v to_o be_v bend_v like_o smoke_n since_o we_o observe_v no_o such_o property_n of_o light_n in_o a_o uniform_a medium_n such_o as_o in_o probability_n the_o aether_n be_v these_o be_v my_o thought_n about_o those_o comet_n which_o appear_v in_o 1664._o and_o 1665._o which_o i_o have_v find_v in_o several_a loose_a paper_n of_o lecture_n read_v in_o the_o begin_n of_o 1665._o and_o i_o have_v not_o have_v the_o opportunity_n of_o make_v 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form_n of_o this_o comet_n i_o manifest_o see_v that_o the_o middle_n of_o the_o blaze_n be_v bright_a than_o the_o side_n part_v thereof_o and_o especial_o that_o part_n which_o be_v immediate_o opposite_a to_o the_o sun_n be_v the_o bright_a of_o all_o which_o will_v have_v be_v otherwise_o if_o the_o light_n have_v depend_v whole_o from_o the_o deflection_n of_o the_o ray_n of_o the_o sun_n for_o one_o may_v rational_o conclude_v that_o the_o nucleus_n or_o star_n in_o the_o middle_n which_o reflect_v so_o great_a a_o quantity_n of_o light_n shall_v have_v cause_v a_o darkness_n in_o the_o part_n behind_o it_o as_o we_o see_v all_o strong_a reflect_a body_n do_v and_o consequent_o that_o the_o middle_a part_n of_o the_o stream_n or_o blaze_v especial_o that_o which_o be_v next_o the_o body_n shall_v not_o have_v be_v so_o bright_a as_o those_o other_o part_n to_o which_o the_o light_n of_o the_o sun_n have_v a_o more_o free_a access_n unless_o it_o may_v be_v say_v that_o even_o 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susceptible_a of_o a_o much_o more_o subtle_a impulse_n even_o from_o light_n itself_o as_o the_o bononian_n stone_n and_o bladwine_v phsophorus_n which_o seem_v to_o be_v so_o harmonious_a as_o i_o may_v so_o speak_v to_o the_o motion_n of_o light_n that_o a_o new_a motion_n be_v thereby_o raise_v in_o it_o and_z continues_z for_o some_o time_n to_o move_v of_o itself_o after_o the_o impulse_n or_o influence_n cease_v not_o much_o unlike_o the_o unison_n string_n or_o other_o sound_a body_n which_o in_o music_n receive_v a_o tremulation_n and_o sound_n from_o the_o motion_n and_o sound_n of_o the_o unison_n body_n or_o string_n that_o be_v strike_v to_o i_o it_o seem_v most_o probable_a that_o the_o body_n and_o part_n of_o the_o comet_n be_v in_o a_o state_n of_o dissolution_n whether_o that_o dissolution_n be_v cause_v by_o the_o part_n of_o the_o aether_n through_o which_o it_o pass_v after_o the_o manner_n as_o a_o torch_n be_v dissolve_v by_o the_o air_n or_o whether_o by_o the_o 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earth_n it_o be_v bound_v but_o on_o one_o side_n namely_o towards_o the_o earth_n and_o be_v indefinite_o extend_v upward_o be_v only_o hinder_v from_o fly_v away_o that_o way_n by_o its_o own_o gravity_n the_o cause_n of_o which_o i_o shall_v some_o other_o time_n explain_v it_o consist_v of_o the_o same_o particle_n single_a and_o separate_v of_o which_o water_n and_o other_o fluid_n do_v conjoin_v and_o compound_v and_o be_v make_v of_o particle_n exceed_v small_a its_o motion_n to_o make_v its_o balance_n with_o the_o rest_n of_o the_o earthy_a body_n be_v exceed_v swift_a and_o its_o vibrative_a space_n exceed_v large_a comparative_a to_o the_o vibrative_a space_n of_o other_o terrestrial_a body_n i_o suppose_v that_o of_o the_o air_n next_o the_o earth_n in_o its_o natural_a state_n may_v be_v 8000_o time_n great_a than_o that_o of_o steel_n and_o above_o a_o thousand_o time_n great_a than_o that_o of_o common_a water_n and_o proportionable_o i_o suppose_v that_o its_o motion_n 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diminish_v that_o be_v if_o it_o be_v suffer_v to_o extend_v to_o twice_o its_o former_a dimension_n its_o vibration_n will_v be_v twice_o as_o long_o and_o the_o number_n of_o its_o vibration_n and_o occursion_n will_v be_v few_o by_o half_a and_o consequent_o its_o endeavour_n outward_a will_v be_v also_o weak_a by_o half_a these_o explanation_n will_v serve_v mutatis_fw-la mutandis_fw-la for_o explain_v the_o spring_n of_o any_o other_o body_n whatsoever_o it_o now_o remain_v that_o i_o show_v how_o the_o constitution_n of_o springy_a body_n be_v such_o the_o vibration_n of_o a_o spring_n or_o a_o body_n move_v by_o a_o spring_n equal_o and_o uniform_o shall_v be_v of_o equal_a duration_n whether_o they_o be_v great_a or_o less_o i_o have_v here_o already_o show_v then_o that_o the_o power_n of_o all_o spring_n be_v proportionate_a to_o the_o degree_n of_o flexure_n viz._n one_o degree_n of_o flexure_n or_o one_o space_n bend_v have_v one_o power_n two_o have_v two_o and_o three_o have_v three_o and_o so_o forward_o and_o every_o point_n of_o the_o space_n of_o flexure_n have_v a_o peculiar_a power_n and_o consequent_o there_o be_v infinite_a point_n of_o the_o space_n there_o must_v be_v infinite_a degree_n of_o power_n and_o consequent_o all_o those_o power_n begin_v from_o nought_o and_o end_v at_o the_o last_o degree_n of_o tension_n or_o bend_n add_v together_o into_o one_o sum_n or_o aggregate_v will_v be_v in_o duplicate_v proportion_n to_o the_o space_n bend_a or_o degree_n of_o flexure_n that_o be_v the_o aggregate_v of_o the_o power_n of_o the_o spring_n tend_v from_o its_o quiescent_n posture_n by_o all_o the_o intermediate_v point_n to_o one_o space_n be_v it_o what_o length_n you_o please_v be_v equal_a or_o in_o the_o same_o proportion_n to_o the_o square_n of_o one_o suppose_v the_o say_a space_n infinite_o divisible_a into_o the_o fraction_n of_o one_o to_o two_o be_v equal_a or_o in_o the_o same_o proportion_n to_o the_o square_n of_o two_o that_o be_v four_o to_o three_o be_v equal_a or_o in_o the_o same_o proportion_n to_o the_o square_n of_o three_o that_o be_v nine_o and_o so_o forward_o and_o consequent_o the_o aggregate_v of_o the_o first_o space_n will_v be_v one_o of_o the_o second_o space_n will_v be_v three_o of_o the_o three_o space_n will_v be_v five_o of_o the_o four_o will_v be_v seven_o and_o so_o onward_o in_o a_o arithmetical_a proportion_n be_v the_o degree_n or_o excess_n by_o which_o these_o aggregate_n exceed_v one_o another_o the_o spring_n therefore_o in_o return_v from_o any_o degree_n of_o flexure_n to_o which_o it_o have_v be_v bend_v by_o any_o power_n receive_v at_o every_o point_n of_o the_o space_n return_v a_o impulse_n equal_a to_o the_o power_n of_o the_o spring_n in_o that_o point_n of_o tension_n and_o in_o return_v the_o whole_a it_o receive_v the_o whole_a aggregate_v of_o all_o the_o force_n belong_v to_o the_o great_a degree_n of_o that_o tension_n from_o which_o it_o return_v so_o a_o spring_n bend_v two_o space_n in_o its_o return_n receive_v four_o degree_n of_o impulse_n that_o be_v three_o in_o the_o first_o space_n return_v and_o one_o in_o the_o second_o so_o bend_v three_o space_n it_o receive_v in_o its_o whole_a return_n nine_o degree_n of_o impulse_n that_o be_v five_o in_o the_o first_o space_n return_v three_o in_o the_o second_o and_o one_o in_o the_o three_o so_o bend_v ten_o space_n it_o receive_v in_o its_o whole_a return_n one_o hundred_o degree_n of_o impulse_n to_o wit_n nineteen_o in_o the_o first_o seventeen_o in_o the_o second_o fifteen_o in_o the_o three_o thirteen_o in_o the_o four_o eleven_o in_o the_o five_o nine_o in_o the_o six_o seven_o in_o the_o seven_o five_o in_o the_o eight_o three_o in_o the_o nine_o and_o one_o in_o the_o ten_o now_o the_o comparative_a velocity_n of_o any_o body_n move_v be_v in_o subduplicate_v proportion_n to_o the_o aggregate_n or_o sum_n of_o the_o power_n by_o which_o it_o be_v move_v therefore_o the_o velocity_n of_o the_o whole_a space_n return_v be_v always_o in_o the_o same_o proportion_n with_o those_o space_n they_o be_v both_o subduplicate_v to_o the_o power_n and_o consequent_o all_o the_o time_n shall_v be_v equal_a next_o for_o the_o velocity_n of_o the_o part_n of_o the_o space_n return_v they_o will_v be_v always_o proportionate_a to_o the_o root_n of_o the_o aggregate_n of_o the_o power_n impress_v in_o every_o of_o these_o space_n for_o in_o the_o last_o instance_n where_o the_o spring_n be_v suppose_v bend_v ten_o space_n the_o velocity_n at_o the_o end_n of_o the_o first_o space_n return_v shall_v be_v as_o the_o root_n of_o 19_o at_o the_o end_n of_o the_o second_o as_o the_o root_n of_o 36._o that_o be_v of_o 19+17_n at_o the_o end_n of_o the_o three_o as_o the_o root_n of_o 51._o that_o be_v of_o 19+17_n +15._o at_o the_o end_n of_o the_o
the_o face_n of_o the_o water_n and_o for_o this_o i_o can_v produce_v very_o many_o history_n and_o argument_n that_o will_v make_v it_o seem_v very_o probable_a but_o that_o i_o reserve_v they_o in_o the_o lecture_n which_o i_o read_v of_o this_o subject_n in_o gresham_n college_n in_o the_o year_n 1664_o and_o 1665_o which_o when_o i_o can_v have_v time_n to_o peruse_v i_o may_v publish_v therein_o i_o make_v it_o probable_a that_o most_o island_n have_v be_v throw_v up_o by_o some_o subterraneous_a eruption_n such_o be_v the_o island_n of_o ascension_n the_o moluccus_n etc._n etc._n second_o that_o most_o part_n of_o the_o surface_n of_o the_o earth_n have_v be_v since_o the_o creation_n change_v in_o its_o position_n and_o height_n in_o respect_n of_o the_o sea_n to_o wit_n many_o part_n which_o be_v now_o dry_a land_n and_o lie_v above_o the_o sea_n have_v be_v in_o former_a age_n cover_v with_o it_o and_o that_o many_o part_n which_o be_v now_o cover_v with_o the_o sea_n be_v in_o former_a time_n dry_a land_n mountain_n have_v be_v sink_v into_o plain_n and_o plain_n have_v be_v raise_v into_o mountain_n of_o these_o by_o observation_n i_o have_v give_v instance_n and_o show_v that_o divers_a part_n of_o england_n have_v in_o former_a time_n be_v cover_v with_o the_o sea_n there_o be_v find_v at_o this_o day_n in_o the_o most_o inland_a part_n thereof_o sufficient_a evidence_n to_o prove_v it_o to_o wit_n shell_n of_o divers_a sort_n of_o fish_n many_o of_o which_o yet_o remain_v of_o the_o animal_n substance_n though_o other_o be_v find_v petrify_v and_o convert_v into_o stone_n some_o of_o these_o be_v find_v raise_v to_o the_o top_n of_o the_o high_a mountain_n other_o sink_v into_o the_o bottom_n of_o the_o deep_a mine_n and_o well_n nay_o in_o the_o very_a bowel_n of_o the_o mountain_n and_o quarry_n of_o stone_n i_o have_v add_v also_o divers_a other_o instance_n to_o prove_v the_o same_o thing_n of_o other_o part_n of_o europe_n and_o have_v manifest_v not_o only_o that_o the_o low_a and_o plain_a part_n thereof_o have_v be_v under_o the_o sea_n but_o that_o even_o the_o high_a alpine_n and_o pyrenean_n mountain_n have_v run_v the_o same_o fate_n many_o instance_n of_o the_o like_a nature_n i_o have_v also_o meet_v with_o in_o relation_n and_o observation_n make_v in_o the_o east_n as_o well_o as_o in_o the_o west_n indies_n of_o all_o which_o strange_a occurrence_n i_o can_v conceive_v no_o cause_n more_o probable_a than_o earthquake_n and_o subterraneous_a eruption_n which_o history_n do_v sufficient_o assure_v we_o have_v change_v sea_n into_o land_n and_o land_n into_o sea_n vale_n into_o mountain_n sometime_o into_o lake_n and_o abysses_n at_o other_o time_n and_o the_o contrary_n unless_o we_o may_v be_v allow_v to_o suppose_v that_o the_o water_n or_o fluid_a part_n of_o the_o earth_n which_o cover_v the_o whole_a at_o first_o and_o afterward_o the_o great_a part_n thereof_o may_v in_o many_o age_n and_o long_a process_n of_o time_n be_v waste_v by_o be_v first_o raise_v into_o the_o atmosphere_n in_o vapour_n and_o thence_o by_o the_o diurnal_a but_o principal_o by_o the_o annual_a motion_n thereof_o be_v lose_v into_o the_o ather_fw-la or_o medium_n through_o which_o it_o pass_v somewhat_o like_o that_o waste_n which_o i_o have_v observe_v to_o be_v in_o comet_n and_o have_v note_v it_o in_o my_o cometa_fw-la or_o unless_o we_o may_v be_v allow_v to_o suppose_v that_o this_o fluid_a part_n be_v waste_v by_o the_o petrifaction_n and_o fixation_n of_o such_o part_n of_o it_o as_o have_v fall_v on_o the_o land_n and_o hill_n and_o never_o return_v to_o fill_v up_o the_o measure_n of_o the_o sea_n out_o of_o which_o it_o be_v exhale_v for_o which_o very_o much_o may_v be_v say_v to_o make_v it_o probable_a that_o the_o water_n of_o the_o earth_n be_v this_o way_n daily_o diminish_v or_o unless_o since_o we_o be_v ascertain_v by_o observation_n that_o the_o direction_n of_o the_o axis_n of_o the_o earth_n be_v change_v and_o grow_v near_o the_o polar_a star_n than_o former_o that_o the_o magnetism_n or_o magnetical_a pole_n be_v vary_v and_o do_v daily_o move_v from_o the_o place_n where_o they_o late_o be_v and_o that_o there_o be_v other_o great_a and_o note_a change_n effect_v in_o the_o earth_n we_o may_v be_v allow_v to_o conceive_v that_o the_o central_n point_n of_o the_o attractive_a or_o gravitating_a power_n of_o the_o earth_n have_v in_o long_a process_n of_o time_n be_v change_v and_o remove_v also_o far_o from_o we_o towards_o our_o antipode_n whence_o will_v follow_v a_o recess_n of_o the_o water_n from_o these_o part_n of_o the_o world_n to_o those_o and_o a_o appearance_n of_o many_o part_n above_o the_o surface_n of_o the_o water_n in_o the_o form_n of_o island_n and_o of_o other_o place_n former_o above_o the_o sea_n now_o in_o the_o form_n of_o mountain_n so_o to_o continue_v till_o by_o the_o libration_n or_o other-way_n return_v motion_n thereof_o it_o repossess_v its_o former_a seat_n and_o place_n and_o overwhelm_v again_o all_o those_o place_n which_o in_o the_o interim_n have_v be_v dry_a and_o uncovered_a with_o the_o return_n of_o the_o same_o water_n since_o nothing_o in_o nature_n be_v find_v exempt_a from_o the_o state_n of_o change_n and_o corruption_n further_o it_o be_v probable_a that_o earthquake_n may_v have_v be_v much_o more_o frequent_a in_o former_a age_n than_o they_o have_v be_v in_o these_o latter_a the_o consideration_n of_o which_o will_v possible_o make_v this_o assertion_n not_o so_o paradoxical_a as_o at_o first_o hear_v it_o may_v seem_v to_o be_v though_o even_o these_o latter_a age_n have_v not_o be_v whole_o barren_a of_o instance_n of_o the_o be_v and_o effect_n of_o they_o to_o convince_v you_o of_o which_o i_o have_v hereunto_o subjoin_v a_o relation_n and_o account_n of_o one_o very_o new_o which_o happen_v in_o the_o isle_n of_o palma_n among_o the_o canary_n next_o the_o clearness_n of_o the_o air_n be_v very_o remarkable_a which_o make_v a_o island_n which_o lie_v eight_o league_n off_o to_o look_v as_o if_o it_o be_v close_o by_o to_o this_o purpose_n i_o have_v often_o take_v notice_n of_o the_o great_a difference_n there_o be_v between_o the_o air_n very_o near_o the_o low_a surface_n of_o the_o earth_n and_o that_o which_o be_v at_o a_o good_a distance_n from_o it_o that_o which_o be_v very_o near_o the_o earth_n be_v general_o so_o thick_a and_o opacous_a that_o body_n can_v at_o any_o considerable_a distance_n be_v see_v distinct_o through_o it_o but_o the_o far_o the_o eye_n and_o object_n be_v elevate_v above_o this_o thick_a air_n the_o more_o clear_a do_v the_o object_n appear_v and_o i_o have_v divers_a time_n take_v notice_n that_o the_o same_o object_n see_v from_o the_o top_n and_o bottom_n of_o a_o high_a tower_n have_v appear_v twice_o as_o far_o off_o when_o see_v at_o the_o bottom_n as_o when_o see_v at_o the_o top_n for_o the_o eye_n do_v very_o much_o judge_n of_o the_o distance_n of_o object_n according_a as_o the_o density_n of_o the_o air_n between_o the_o eye_n and_o object_n do_v represent_v they_o hence_o i_o have_v see_v man_n look_v of_o gigantic_a bigness_n in_o a_o fog_n cause_v by_o reason_n that_o the_o fog_n make_v the_o eye_n judge_v the_o object_n much_o far_o off_o than_o real_o it_o be_v when_o at_o the_o same_o time_n the_o visible_a angle_n alter_v not_o this_o great_a thickness_n of_o the_o low_a air_n be_v sufficient_o manifest_a in_o the_o celestial_a body_n few_o of_o the_o fix_a star_n or_o small_a planet_n be_v visible_a till_o they_o be_v a_o considerable_a way_n raise_v above_o the_o horizon_n the_o three_o remark_n about_o the_o moistness_n of_o the_o fog_n and_o the_o production_n of_o water_n at_o that_o height_n i_o have_v before_o insist_v on_o only_o the_o almost_o continual_a fog_n that_o this_o gentleman_n observe_v in_o the_o wood_n they_o pass_v be_v very_o remarkable_a for_o the_o origine_fw-la of_o spring_n nor_o shall_v i_o say_v any_o thing_n concern_v the_o vast_a perpendicular_a height_n of_o the_o same_o but_o for_o a_o close_a of_o this_o present_a collection_n i_o shall_v add_v the_o short_a account_n of_o the_o eruption_n which_o late_o happen_v in_o the_o palma_n a_o true_a relation_n of_o the_o vulcanos_fw-la which_o break_v out_o in_o the_o island_n of_o the_o palma_n novemb_n 13._o 1677._o saturday_n the_o thirteen_o of_o november_n 1677._o a_o quarter_n of_o a_o hour_n after_o sun_n set_v happen_v a_o shake_n or_o earthquake_n in_o the_o island_n of_o st._n michael_n de_fw-fr la_fw-fr palma_n one_o of_o the_o canary_n island_n from_o the_o low_a pyrenna_n and_o within_o a_o league_n of_o the_o city_n unto_o the_o port_n of_o tassacorte_n which_o be_v account_v