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matter_n the_o figure_n situation_n and_o motion_n of_o its_o small_a part_n sect_n xix_o wherefore_o decline_v to_o add_v any_o thing_n in_o this_o place_n to_o what_o we_o have_v otherwhere_o discourse_v concern_v the_o origine_fw-la of_o motion_n and_o the_o possibility_n or_o impossibility_n of_o a_o vacuum_n we_o will_v proceed_v to_o take_v notice_n that_o there_o be_v one_o thing_n more_o which_o we_o may_v learn_v from_o salt-petre_n touch_v the_o nature_n of_o fluidity_n and_o that_o be_v the_o distinction_n betwixt_o a_o fluid_a body_n and_o a_o wet_n liquor_n which_o be_v wont_a because_o they_o agree_v in_o many_o thing_n to_o be_v confound_v but_o inconsiderate_o enough_o for_o though_o every_o wet_n liquor_n be_v fluid_a yet_o every_o fluid_a body_n do_v not_o wet_a the_o air_n the_o aether_n and_o even_o flame_n itself_o may_v be_v proper_o call_v fluid_a body_n according_a to_o the_o notion_n of_o fluidity_n hitherto_o make_v out_o and_o yet_o will_v scarce_o by_o any_o 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have_v the_o liberty_n to_o fly_v away_o but_o may_v be_v draw_v back_o by_o some_o other_o corpuscle_n wherewith_o it_o be_v yet_o connect_v and_o which_o happen_v to_o be_v itself_o thrust_v inward_a may_v draw_v after_o it_o and_o so_o entangle_v again_o our_o almost_o disband_v corpuscle_n beside_o that_o the_o gravity_n of_o the_o component_a particle_n of_o a_o body_n be_v oftentimes_o such_o that_o it_o be_v easy_a for_o the_o agent_n that_o put_v they_o in_o motion_n to_o continue_v they_o in_o that_o slow_a motion_n among_o themselves_o than_o drive_v they_o up_o into_o so_o light_a a_o medium_n as_o the_o air_n as_o experience_n show_v in_o those_o body_n that_o be_v call_v fix_v as_o gold_n and_o glass_n though_o in_o actual_a fusion_n but_o i_o forget_v that_o i_o promise_v you_o to_o decline_v speculation_n and_o therefore_o i_o shall_v only_o name_v to_o you_o a_o couple_n of_o instance_n which_o will_v serve_v to_o confirm_v both_o what_o i_o be_v late_o say_v and_o what_o i_o be_o now_o in_o prove_v sect_n v._o the_o first_o of_o these_o i_o shall_v take_v from_o what_o be_v usual_o grant_v as_o matter_n of_o fact_n namely_o that_o if_o a_o spring_n though_o make_v of_o so_o hard_a a_o body_n as_o steel_n be_v forcible_o bend_v and_o keep_v but_o a_o moderate_a while_n in_o that_o posture_n as_o soon_o as_o the_o force_n that_o keep_v it_o bend_v be_v remove_v it_o will_v again_o return_v to_o its_o former_a figure_n but_o if_o it_o be_v keep_v too_o long_o in_o that_o force_a position_n it_o will_v by_o degree_n lose_v that_o which_o they_o call_v the_o motion_n of_o restitution_n and_o retain_v its_o new_a crooked_a figure_n though_o the_o force_n that_o bend_v â—t_z be_v remove_v which_o show_v both_o the_o power_n of_o some_o of_o the_o more_o familiar_a agent_n in_o nature_n and_o which_o be_v that_o the_o show_v whereof_o i_o here_o chief_o aim_n at_o that_o where_o there_o be_v a_o continue_a endeavour_n of_o the_o part_n of_o a_o body_n to_o put_v themselves_o into_o another_o state_n yet_o the_o motion_n or_o rather_o the_o progress_n may_v be_v much_o more_o slow_a than_o man_n seem_v as_o yet_o to_o have_v take_v notice_n of_o since_o it_o be_v a_o great_a while_n before_o â—he_n texture_n of_o the_o corpuscle_n of_o the_o steel_n be_v so_o alter_v as_o to_o make_v they_o lose_v their_o former_a springiness_n but_o i_o will_v second_v this_o with_o a_o more_o illustrious_a experiment_n which_o will_v at_o once_o confirm_v what_o i_o have_v just_a now_o say_v and_o show_v that_o the_o air_n or_o the_o invisible_a corpuscle_n harbour_v in_o it_o may_v have_v no_o inconsiderable_a power_n to_o act_v upon_o and_o effect_n change_v in_o the_o solid_a body_n to_o this_o purpose_n i_o shall_v only_o observe_v to_o you_o that_o though_o if_o a_o bar_n of_o iron_n have_v one_o of_o its_o end_n hold_v perpendicular_o and_o at_o a_o fit_a distance_n to_o the_o lily_n or_o north-point_n of_o the_o mariner_n compass_n i_o mean_v that_o which_o point_v towards_o the_o north_n it_o will_v as_o i_o elsewhere_o mention_n drive_v it_o away_o towards_o the_o east_n or_o west_n and_o if_o this_o same_o low_a end_n of_o the_o bar_n of_o iron_n be_v put_v into_o a_o contrary_a posture_n it_o will_v present_o lose_v its_o temporary_a magnetism_n as_o i_o elsewhere_o declare_v yet_o if_o this_o bar_n be_v very_o long_o keep_v upright_o in_o a_o window_n or_o other_o convenient_a place_n then_o as_o some_o late_a magnetical_a writer_n will_v tell_v you_o it_o will_v have_v acquire_v a_o constant_a and_o durable_a magnetic_a power_n which_o be_v a_o phaenomenon_n that_o make_v exceed_o for_o our_o present_a purpose_n since_o it_o hence_o appear_v both_o that_o the_o air_n together_o with_o the_o magnetical_a effluvia_fw-la of_o the_o
only_o they_o will_v have_v a_o vitriolate_a efflorescence_n if_o i_o may_v so_o speak_v on_o their_o superficies_n as_o i_o have_v observe_v in_o divers_a other_o marchasite_n but_o they_o will_v in_o tract_n of_o time_n burst_v the_o stone_n in_o piece_n of_o which_o sort_n i_o have_v sometime_o since_o and_o i_o hope_v i_o have_v yet_o a_o bulky_a marchasite_n that_o i_o procure_v from_o a_o virtuoso_fw-la that_o live_v just_a by_o a_o vitriol-work_n whither_o these_o among_o other_o vitriol-stone_n be_v bring_v and_o where_o this_o stone_n be_v choose_v for_o its_o largeness_n be_v take_v up_o and_o careful_o keep_v by_o that_o ingenious_a person_n till_o it_o burst_v of_o itself_o and_o till_o i_o send_v for_o it_o and_o to_o satisfy_v myself_o a_o little_a further_o that_o the_o internal_a part_n of_o marchasite_n may_v be_v as_o well_o dispose_v to_o be_v vitriolate_v as_o the_o external_a i_o remember_v i_o break_v a_o hard_a marchasite_n that_o i_o have_v from_o another_o place_n and_o lay_v it_o some_o short_a time_n in_o a_o chamber-window_n i_o find_v the_o new_a superficies_n make_v by_o the_o tracture_n about_o the_o middle_n of_o the_o stone_n to_o have_v acquire_v a_o efflorescence_n of_o a_o vitriolate_a nature_n the_o other_o instance_n which_o be_v very_o odd_a and_o much_o talk_v of_o be_v this_o a_o ingenious_a gentleman_n of_o my_o acquaintance_n casual_o meet_v i_o one_o day_n tell_v i_o that_o he_o have_v a_o turquois-stone_n which_o if_o he_o be_v not_o mistake_v have_v a_o wonderful_a property_n for_o there_o be_v in_o it_o several_a spot_n of_o colour_n differ_v from_o the_o rest_n of_o the_o gem_n these_o spot_n seem_v though_o very_o slow_o to_o move_v from_o one_o part_n of_o the_o stone_n to_o the_o other_o and_o this_o he_o think_v himself_o to_o have_v take_v notice_n of_o for_o very_a many_o month_n perhaps_o a_o couple_n of_o year_n this_o relation_n seem_v so_o strange_a that_o the_o relator_n be_v not_o at_o all_o surprise_v when_o to_o ascertain_v myself_o of_o the_o truth_n of_o it_o i_o desire_v to_o have_v the_o ring_n this_o stone_n be_v set_v in_o for_o a_o while_n in_o my_o own_o keep_n to_o which_o he_o ready_o assent_v beside_o that_o i_o take_v very_o heedful_a notice_n of_o the_o situation_n of_o the_o spot_n i_o employ_v a_o very_a ingenious_a youth_n that_o then_o live_v with_o i_o and_o be_v skilled_a in_o draw_v to_o make_v the_o picture_n of_o the_o stone_n with_o the_o spot_n as_o they_o be_v then_o place_v and_o afterward_o to_o have_v a_o watchful_a eye_n upon_o it_o and_o from_o time_n to_o time_n as_o once_o perhaps_o in_o two_o or_o three_o week_n to_o draw_v a_o new_a picture_n of_o they_o by_o compare_v several_a of_o which_o picture_n it_o be_v unanimous_o conclude_v that_o the_o spot_n do_v shift_v place_n in_o the_o turquois_n as_o if_o the_o matter_n they_o consist_v of_o make_v its_o way_n through_o the_o substance_n of_o the_o stone_n as_o we_o late_o note_v that_o the_o gum_n of_o lignum_fw-la vitæ_fw-la seem_v to_o do_v through_o the_o substance_n of_o the_o wood_n and_o as_o far_o as_o we_o observe_v the_o motion_n of_o these_o spot_n be_v exceed_o slow_a and_o irregular_a though_o perhaps_o it_o may_v have_v be_v reduce_v to_o a_o somewhat_o less_o uncertainty_n be_v it_o not_o that_o by_o a_o unwelcome_a accident_n we_o be_v deprive_v of_o the_o opportunity_n of_o continue_v our_o observation_n long_o enough_o and_o this_o bring_v into_o my_o mind_n that_o the_o turquois_n be_v a_o stone_n of_o which_o â—_o have_v meet_v strange_a story_n in_o good_a author_n i_o once_o ask_v several_a question_n about_o it_o of_o a_o note_a jeweller_n and_o inquire_v among_o other_o particular_n whether_o he_o have_v not_o observe_v some_o change_n that_o seem_v spontaneous_a in_o the_o substance_n or_o colour_n of_o the_o stone_n he_o reply_v that_o in_o some_o few_o turquois_n he_o have_v observe_v two_o differ_v blews_n in_o differ_v part_n of_o the_o same_o stone_n and_o that_o one_o of_o those_o colour_n will_v by_o slow_a and_o unperceived_a degree_n invade_v and_o at_o length_n overspread_v that_o part_n of_o the_o stone_n which_o the_o other_o colour_n possess_v before_o i_o shall_v here_o add_v that_o the_o same_o gentleman_n that_o lend_v i_o the_o spot_a turquois_n show_v i_o afterward_o a_o agate_n haft_v of_o a_o knife_n where_o be_v a_o certain_a cloud_n which_o he_o tell_v i_o a_o ingenious_a person_n have_v for_o some_o year_n observe_v to_o remove_v to_o and_o fro_o in_o the_o stone_n and_o have_v a_o while_n since_o to_o convince_v the_o relator_n lend_v he_o the_o agate_n of_o who_o phaenomena_n he_o promise_v i_o a_o account_n when_o he_o shall_v have_v have_v the_o stone_n in_o his_o custody_n for_o a_o competent_a time_n till_o the_o expiration_n of_o which_o it_o may_v suffice_v to_o have_v say_v of_o this_o agate_n what_o i_o have_v now_o relate_v sect_n ix_o but_o because_o that_o diamond_n and_o glass_n be_v general_o look_v upon_o especial_o by_o chemist_n as_o body_n of_o the_o close_a and_o firm_a texture_n that_o nature_n and_o art_n afford_v if_o we_o can_v show_v a_o intestine_a motion_n even_o in_o the_o part_n of_o these_o fit_a instance_n for_o our_o purpose_n can_v not_o in_o reason_n be_v desire_v i_o shall_v venture_v to_o say_v something_o of_o each_o of_o they_o though_o what_o i_o have_v to_o say_v about_o diamond_n be_v propose_v rather_o to_o ground_v a_o suspicion_n of_o what_o may_v be_v than_o a_o demonstration_n that_o it_o must_v be_v in_o the_o first_o place_n then_o to_o remove_v that_o prejudice_n that_o may_v be_v entertain_v from_o the_o incomparable_a hardness_n of_o diamond_n â—which_v i_o confess_v experience_n have_v make_v i_o admire_v as_o if_o body_n so_o hard_a and_o solid_a can_v not_o have_v their_o part_n put_v into_o motion_n but_o by_o some_o extraordinary_a not_o to_o say_v prodigious_a force_n i_o shall_v only_o repeat_v here_o what_o i_o have_v elsewhere_o show_v that_o diamond_n be_v body_n that_o easy_o enough_o become_v actual_o electrical_a and_o that_o some_o diamond_n of_o which_o sort_n i_o have_v a_o small_a one_o by_o i_o will_v by_o rub_v upon_o a_o cloth_n be_v bring_v to_o shine_v in_o the_o dark_a the_o quist_n of_o both_o which_o transient_a quality_n require_v a_o change_n of_o texture_n even_o in_o the_o internal_a part_n and_o the_o friction_n that_o produce_v that_o change_n do_v it_o immediate_o by_o put_v the_o part_n of_o the_o stone_n into_o local-motion_n it_o may_v be_v thence_o argue_v that_o a_o very_a moderate_a force_n may_v suffice_v to_o beget_v a_o internal_a motion_n in_o the_o inward_a particle_n of_o diamond_n themselves_o and_o i_o be_o not_o sure_a but_o that_o more_o hide_a agent_n may_v make_v impression_n upon_o these_o hard_a body_n for_o in_o a_o ring_n that_o i_o be_o wont_a to_o wear_v on_o my_o little_a finger_n which_o have_v no_o diamond_n save_o one_o more_o than_o that_o shine_a one_o i_o late_o mention_v i_o have_v i_o know_v not_o how_o often_o seem_v to_o myself_o to_o observe_v a_o manifest_o great_a clearness_n and_o sparklingness_n at_o some_o time_n than_o at_o other_o though_o i_o can_v not_o refer_v it_o to_o the_o clearness_n or_o dulness_n of_o the_o weather_n the_o moisture_n or_o dryness_n of_o thâ—_n air_n the_o superficial_a clearness_n or_o foulness_n of_o the_o stone_n or_o any_o other_o manifest_a cause_n i_o can_v think_v of_o and_o in_o this_o i_o be_v the_o more_o incline_v to_o think_v i_o may_v not_o be_v mistake_v because_o beside_o that_o the_o notice_n i_o take_v of_o it_o be_v frequent_a i_o have_v by_o i_o a_o rough_a diamond_n just_a as_o it_o come_v from_o the_o rock_n in_o who_o electrical_a faculty_n i_o have_v take_v notice_n of_o change_n as_o to_o the_o degree_n of_o strength_n wherewith_o it_o attract_v and_o that_o within_o the_o compass_n of_o a_o very_a little_a time_n though_o i_o can_v not_o find_v any_o cause_n whereto_o i_o can_v refer_v so_o surprise_v a_o phaenomenon_n and_o i_o must_v not_o here_o omit_v that_o chance_v one_o day_n to_o show_v the_o new_o mention_v diamond_n ring_n to_o a_o very_a ingenious_a lady_n that_o use_v to_o wear_v in_o ring_n and_o bracelet_n store_n of_o those_o gem_n and_o tell_v she_o what_o change_v i_o have_v take_v notice_n of_o in_o the_o diamond_n she_o who_o have_v observe_v more_o about_o gem_n than_o any_o lady_n i_o have_v yet_o meet_v with_o appear_v but_o little_o surprise_v at_o what_o i_o tell_v she_o and_o affirm_v to_o i_o that_o she_o have_v divers_a time_n observe_v the_o like_a alteration_n in_o some_o diamond_n of_o she_o which_o sometime_o will_v look_v more_o sparkling_o than_o they_o be_v wont_a and_o sometime_o far_o more_o dull_a than_o