seem_v to_o be_v very_o perfect_o and_o thus_o far_o we_o have_v try_v the_o experiment_n and_o find_v it_o to_o succeed_v even_o by_o the_o light_n of_o candle_n of_o the_o large_a size_n if_o you_o so_o hold_v the_o vial_n over_o against_o your_o eye_n that_o it_o may_v have_v a_o window_n on_o one_o side_n of_o it_o and_o a_o dark_a part_n of_o the_o room_n both_o before_o it_o and_o on_o the_o other_o side_n you_o shall_v see_v the_o liquor_n partly_o of_o a_o bluish_a and_o partly_o of_o a_o golden_a colour_n if_o turn_v your_o back_n to_o the_o window_n you_o power_n out_o some_o of_o the_o liquor_n towards_o the_o light_n and_o towards_o your_o eye_n it_o will_v seem_v at_o the_o come_n out_o of_o the_o glass_n to_o be_v perfect_o coeruleous_a but_o when_o it_o be_v sallen_v down_o a_o little_a way_n the_o drop_n may_v seem_v particoloured_a according_a as_o the_o beam_n of_o light_n do_v more_o or_o less_o full_o penetrate_v and_o illustrate_v they_o if_o you_o take_v a_o basin_n about_o half_a full_a of_o water_n and_o have_v place_v it_o so_o in_o the_o sunbeam_n shine_v into_o a_o room_n that_o one_o part_n of_o the_o water_n may_v be_v free_o illustrate_v by_o the_o beam_n of_o light_n and_o the_o other_o part_n of_o it_o darken_v by_o the_o shadow_n of_o the_o brim_n of_o the_o basin_n if_o then_o i_o say_v you_o drop_v of_o our_o tincture_n make_v somewhat_o strong_a both_o into_o the_o shade_v and_o illuminate_v part_n of_o the_o water_n you_o may_v by_o look_v upon_o it_o from_o several_a place_n and_o by_o a_o little_a agitation_n of_o the_o water_n observe_v divers_a please_a phoenomena_fw-la which_o be_v tedious_a to_o particularize_v if_o you_o power_n a_o little_a of_o this_o tincture_n upon_o a_o sheet_n of_o white_a paper_n so_o as_o the_o liquor_n may_v remain_v of_o some_o depth_n upon_o it_o you_o may_v perceive_v the_o neighbour_a drop_n to_o be_v partly_o of_o one_o colour_n and_o partly_o of_o the_o other_o according_a to_o the_o position_n of_o your_o eye_n in_o reference_n to_o the_o light_n when_o it_o look_v upon_o they_o but_o if_o you_o power_n off_o all_o the_o liquor_n the_o paper_n will_v seem_v die_v of_o a_o almost_o yellow_a colour_n and_o if_o a_o sheet_n of_o paper_n with_o some_o of_o this_o liquor_n in_o it_o be_v place_v in_o a_o window_n where_o the_o sunbeam_n may_v shine_v free_o on_o it_o then_o if_o you_o turn_v your_o back_n to_o the_o sun_n and_o take_v a_o pen_n or_o some_o such_o slender_a body_n and_o hold_v it_o overthwart_a betwixt_o the_o sun_n and_o the_o liquor_n you_o may_v perceive_v that_o the_o shadow_n project_v by_o the_o pen_n upon_o the_o liquor_n will_v not_o all_o of_o it_o be_v a_o vulgar_a and_o dark_a but_o in_o part_n a_o curious_o colour_a shadow_n that_o edge_n of_o it_o which_o be_v next_o the_o body_n that_o make_v it_o be_v almost_o of_o a_o lively_a golden_a colour_n and_o the_o remote_a verge_n of_o a_o coeruleous_a one_o these_o and_o other_o phoenomena_fw-la which_o i_o have_v observe_v in_o this_o delightful_a experiment_n divers_a of_o my_o friend_n have_v look_v upon_o not_o without_o some_o wonder_n and_o i_o remember_v a_o excellent_a oculist_n find_v by_o accident_n in_o a_o friend_n chamber_n a_o fine_a vial_n full_a of_o this_o liquor_n which_o i_o have_v give_v that_o friend_n and_o have_v never_o hear_v any_o thing_n of_o the_o experiment_n nor_o have_v any_o body_n near_o he_o that_o can_v tell_v he_o what_o this_o strange_a liquor_n may_v be_v be_v a_o great_a while_n apprehensive_a as_o he_o present_o after_o tell_v i_o that_o some_o strange_a new_a distemper_n be_v invade_v his_o eye_n and_o i_o confess_v that_o the_o unusualness_n of_o the_o phoenomena_fw-la make_v i_o very_o solicitous_a to_o find_v out_o the_o cause_n of_o this_o experiment_n and_o though_o i_o be_o far_o from_o pretend_v to_o have_v find_v it_o yet_o my_o inquiry_n have_v i_o suppose_v enable_v i_o to_o give_v such_o hint_n as_o may_v 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wood._n and_o to_o try_v whether_o these_o subtle_a part_n be_v volatile_a enough_o to_o be_v distil_v without_o the_o dissolution_n of_o their_o texture_n i_o careful_o distil_v some_o of_o the_o tinct_a liquor_n in_o very_o low_a vessel_n and_o the_o gentle_a heat_n of_o a_o lamp_n furnace_n but_o find_v all_o that_o come_v over_o to_o be_v as_o limpid_n and_o colourless_a as_o rock-water_n and_o the_o liquor_n remain_v in_o the_o vessel_n to_o be_v so_o deep_o coeruleous_a that_o it_o require_v to_o be_v oppose_v to_o a_o very_a strong_a light_n to_o appear_v of_o any_o other_o colour_n i_o take_v likewise_o a_o vial_n with_o spirit_n of_o wine_n and_o a_o little_a salt_n of_o hartshorn_n and_o find_v that_o there_o be_v a_o certain_a proportion_n to_o be_v meet_v with_o betwixt_o the_o liquor_n and_o the_o salt_n which_o make_v the_o mixture_n fit_a to_o exhibit_v some_o little_a variety_n of_o colour_n not_o observable_a in_o ordinary_a liquor_n as_o it_o be_v various_o direct_v in_o reference_n to_o the_o light_n and_o the_o eye_n but_o this_o change_n of_o colour_n be_v very_o far_o short_a from_o that_o which_o we_o have_v admire_v in_o our_o tincture_n but_o however_o i_o suspect_v that_o the_o ting_a particle_n do_v abound_v with_o such_o salt_n who_o texture_n and_o the_o colour_n spring_v from_o it_o will_v probable_o be_v alter_v by_o pierce_a acid_n salt_n which_o will_v in_o likelihood_n either_o make_v some_o dissipation_n of_o their_o part_n or_o associate_v themselves_o to_o the_o like_a body_n and_o either_o way_n alter_v the_o colour_n exhibit_v by_o they_o whereupon_o pour_v into_o a_o small_a vial_n full_a of_o impregnated_a water_n a_o very_a little_a spirit_n of_o vinegar_n i_o find_v that_o according_a to_o my_o expectation_n the_o coeruleous_a colour_n immediate_o vanish_v but_o be_v deceive_v in_o the_o expectation_n i_o have_v that_o the_o golden_a colour_n will_v do_v so_o too_o for_o which_o way_n soever_o i_o turn_v the_o vial_n either_o to_o or_o from_o the_o light_n i_o find_v the_o liquor_n to_o appear_v always_o of_o a_o yellowish_a colour_n and_o no_o other_o upon_o this_o i_o imagine_v that_o the_o acid_n salt_n of_o the_o vinegar_n have_v be_v able_a to_o deprive_v the_o liquor_n of_o its_o coeruleous_a colour_n a_o sulphureous_a salt_n be_v of_o a_o contrary_a nature_n will_v be_v able_a to_o mortify_v the_o saline_n particle_n of_o vinegar_n and_o destroy_v their_o effect_n and_o according_o have_v place_v myself_o betwixt_o the_o window_n and_o the_o vial_n and_o into_o the_o same_o liquor_n drop_v a_o few_o drop_n of_o oil_n of_o tartar_n per_fw-la deliquium_fw-la as_o chemist_n call_v it_o i_o observe_v with_o pleasure_n that_o immediate_o upon_o the_o diffusion_n of_o this_o liquor_n the_o impregnated_a water_n be_v restore_v to_o its_o former_a coeruleous_a colour_n and_o this_o liquor_n of_o tartar_n be_v very_a ponderous_n and_o fall_v at_o first_o to_o the_o bottom_n of_o the_o vial_n it_o be_v easy_a to_o observe_v that_o for_o a_o little_a while_o the_o low_a part_n of_o the_o liquor_n appear_v deep_o coeruleous_a whilst_o all_o the_o upper_a part_n retain_v its_o former_a yellowness_n which_o it_o immediate_o lose_v as_o soon_o as_o either_o agitation_n or_o time_n have_v make_v a_o competent_a diffusion_n of_o the_o liquor_n of_o tartar_n through_o the_o body_n of_o the_o former_a tincture_n and_o this_o restore_v liquor_n do_v as_o it_o be_v look_v upon_o against_o or_o from_o the_o light_n exhibit_v the_o same_o phaenomena_n as_o the_o tinct_a water_n do_v before_o either_o of_o the_o adventitious_a liquor_n be_v pour_v into_o it_o have_v make_v pyrophilus_n divers_a trial_n upon_o this_o nephritick_n wood_n we_o find_v mention_v make_v of_o it_o by_o the_o industrious_a jesuit_n kircherus_n who_o
will_v add_v a_o experiment_n of_o our_o own_o make_v before_o we_o meet_v with_o that_o which_o though_o in_o many_o circumstance_n very_o differ_v serve_v to_o prove_v the_o same_o thing_n for_o have_v take_v of_o the_o deep_o red_a juice_n of_o buckthorn_n berry_n which_o i_o buy_v of_o the_o man_n that_o use_v to_o sell_v it_o to_o the_o apothecary_n to_o make_v their_o syrup_n de_fw-fr spina_n cervina_fw-la i_o let_v some_o of_o it_o drop_v upon_o a_o piece_n of_o white_a paper_n and_o have_v leave_v it_o there_o for_o many_o hour_n till_o the_o paper_n be_v grow_v dry_a again_o i_o find_v what_o i_o be_v incline_v to_o suspect_v namely_o that_o this_o juice_n be_v degenerate_v from_o a_o deep_a red_a to_o a_o dirty_a kind_n of_o greyish_a colour_n which_o in_o a_o great_a part_n of_o the_o stain_a paper_n seem_v not_o to_o have_v so_o much_o as_o a_o eye_n of_o red_a though_o a_o little_a spirit_n of_o salt_n or_o dissolve_v alcaly_a will_v turn_v this_o unpleasant_a colour_n as_o former_o i_o tell_v you_o it_o will_v change_v the_o not_o yet_o alter_v juice_n into_o a_o red_a or_o green_n and_o to_o satisfy_v myself_o that_o this_o degeneration_n of_o colour_n do_v not_o proceed_v from_o the_o paper_n i_o drop_v some_o of_o the_o deep_a red_a or_o crimson_a juice_n upon_o a_o white_a glaze_v tile_n and_o suffer_v it_o to_o dry_v on_o there_o i_o find_v that_o even_o in_o that_o body_n on_o which_o it_o can_v not_o soak_v and_o by_o which_o it_o can_v not_o be_v wrought_v it_o nevertheless_o lose_v its_o colour_n and_o these_o instance_n pyrophilus_n i_o be_o the_o more_o careful_a to_o mention_v to_o you_o that_o you_o may_v not_o be_v much_o surprise_v or_o discourage_v if_o you_o shall_v sometime_o miss_v of_o perform_v punctual_o what_o i_o affirm_v myself_o to_o have_v do_v in_o point_n of_o change_a colour_n since_o in_o these_o experiment_n the_o oversight_n or_o neglect_n of_o such_o little_a circumstance_n as_o in_o many_o other_o will_v not_o be_v perhaps_o considerable_a may_v occasion_v the_o miscarrying_a of_o a_o trial._n and_o i_o be_v willing_a also_o to_o take_v this_o occasion_n of_o advertise_v you_o in_o the_o repeat_n of_o the_o experiment_n mention_v in_o this_o treatise_n to_o make_v use_n of_o the_o juice_n of_o vegetable_n and_o other_o thing_n prepare_v for_o your_o trial_n as_o soon_o as_o ever_o they_o be_v ready_a lest_o one_o or_o other_o of_o they_o grow_v less_o fit_a if_o not_o quite_o unfit_a by_o delay_n and_o to_o estimate_v the_o event_n of_o the_o trial_n by_o the_o change_n that_o be_v produce_v present_o upon_o the_o due_a and_o sufficient_a application_n of_o active_n to_o passive_n as_o they_o speak_v because_o in_o many_o case_n the_o effect_n of_o such_o mixture_n may_v not_o be_v last_v and_o the_o new_o produce_v colour_n may_v in_o a_o little_a time_n degenerate_a but_o pyrophilus_n i_o forget_v to_o add_v to_o the_o two_o former_a observation_n late_o make_v about_o vegetable_n a_o three_o of_o the_o same_o import_n make_v in_o mineral_n substance_n by_o tell_v you_o that_o the_o better_a to_o satisfy_v a_o friend_n or_o two_o in_o this_o particular_a i_o sometime_o make_v according_a to_o some_o conjecture_n of_o i_o this_o experiment_n that_o have_v dissolve_v good_a silver_n in_o aquafortis_n and_o precipitate_v it_o with_o spirit_n of_o salt_n upon_o the_o first_o decant_v of_o the_o liquor_n the_o remain_a matter_n will_v be_v pure_o white_a but_o after_o it_o have_v lie_v a_o while_n uncover_v that_o part_n of_o it_o that_o be_v contiguous_a to_o the_o air_n will_v not_o only_o lose_v its_o whiteness_n but_o appear_v of_o a_o very_a dark_a and_o almost_o blackish_a colour_n i_o say_v that_o part_n that_o be_v contiguous_a to_o the_o air_n because_o if_o that_o be_v gentle_o take_v off_o the_o subjacent_a part_n of_o the_o same_o mass_n will_v appear_v very_o white_a till_o that_o also_o have_v continue_v a_o while_n expose_v to_o the_o air_n will_v likewise_o degenerate_a now_o whether_o the_o air_n perform_v these_o thing_n by_o the_o mean_n of_o a_o subtle_a salt_n which_o we_o elsewhere_o show_v it_o not_o to_o be_v destitute_a of_o or_o by_o a_o pierce_a moisture_n that_o be_v apt_a easy_o to_o insinuate_v itself_o into_o the_o pore_n of_o some_o body_n and_o thereby_o change_v their_o texture_n and_o so_o their_o colour_n or_o by_o solicit_v the_o avolation_n of_o certain_a part_n of_o the_o body_n to_o which_o it_o be_v contiguous_a or_o by_o some_o other_o way_n which_o possible_o i_o may_v elsewhere_o propose_v and_o consider_v i_o have_v not_o now_o the_o leisure_n to_o discourse_v and_o for_o the_o same_o reason_n though_o i_o can_v add_v many_o other_o instance_n of_o what_o i_o former_o note_v touch_v the_o emergency_n of_o redness_n upon_o the_o digestion_n of_o many_o body_n insomuch_o that_o i_o have_v often_o see_v upon_o the_o border_n of_o france_n and_o probable_o we_o may_v have_v the_o like_a in_o england_n a_o sort_n of_o pear_n which_o digest_v for_o some_o time_n with_o a_o little_a wine_n in_o a_o vessel_n exact_o close_v will_v in_o not_o many_o hour_n appear_v throughout_o of_o a_o deep_a red_a colour_n as_o also_o that_o of_o the_o juice_n wherein_o they_o be_v stew_v become_v but_o even_o on_o pure_a and_o white_a salt_n of_o tartar_n pure_a spirit_n of_o wine_n as_o clear_a as_o rock-water_n will_v as_o we_o elsewhere_o declare_v by_o long_a digestion_n acquire_v a_o redness_n though_o i_o say_v such_o instance_n may_v be_v multiply_v and_o though_o there_o be_v some_o other_o obvious_a change_n of_o colour_n which_o happen_v so_o frequent_o that_o they_o can_v but_o be_v as_o well_o considerable_a as_o notorious_a such_o as_o be_v the_o blackness_n of_o almost_o all_o body_n burn_v in_o the_o open_a air_n yet_o our_o haste_n invite_v we_o to_o resign_v you_o the_o exercise_n of_o inquire_v into_o the_o cause_n of_o these_o change_n and_o certain_o the_o reason_n both_o why_o the_o soot_v of_o such_o differ_a body_n be_v almost_o all_o of_o they_o all_o black_a why_o so_o much_o the_o great_a part_n of_o vegetable_n shall_v be_v rather_o green_a than_o of_o any_o other_o colour_n and_o particular_o which_o more_o direct_o concern_v this_o place_n why_o gentle_a heat_n do_v so_o frequent_o in_o chemical_a operation_n produce_v rather_o a_o redness_n than_o another_o colour_n in_o digest_v menstruum_n not_o only_o sulphureous_a as_o spirit_n of_o wine_n but_o saline_n as_o spirit_n of_o vinegar_n may_v be_v very_o well_o worth_a a_o serious_a inquiry_n which_o i_o shall_v therefore_o recommend_v to_o pyrophilus_n and_o his_o ingenious_a friend_n experiment_n xxxvii_o it_o may_v seem_v somewhat_o strange_a that_o if_o you_o take_v the_o crimson_a solution_n of_o cochineel_n or_o the_o juice_n of_o black_a cherry_n and_o of_o some_o other_o vegetable_n that_o afford_v the_o like_a colour_n which_o because_o many_o take_v but_o for_o a_o deep_a red_a we_o do_v with_o they_o sometime_o call_v it_o so_o and_o let_v some_o of_o it_o fall_v upon_o a_o piece_n of_o paper_n a_o drop_n or_o two_o of_o a_o acid_n spirit_n such_o as_o spirit_n of_o salt_n or_o aquafortis_n will_v immediate_o turn_v it_o into_o a_o fair_a red._n whereas_o if_o you_o make_v a_o infusion_n of_o brazil_n in_o fair_a water_n and_o drop_v a_o little_a spirit_n of_o salt_n or_o aquafortis_n into_o it_o that_o will_v destroy_v its_o redness_n and_o leave_v the_o liquor_n of_o a_o yellow_a sometime_o pale_a i_o may_v perhaps_o plausible_o enough_o say_v on_o this_o occasion_n that_o if_o we_o consider_v the_o case_n a_o little_a more_o attentive_o we_o may_v take_v notice_n that_o the_o action_n of_o the_o acid_n spirit_n seem_v in_o both_o case_n but_o to_o weaken_v the_o colour_n of_o the_o liquor_n on_o which_o it_o fall_v and_o so_o though_o it_o destroy_v redness_n in_o the_o tincture_n of_o brazil_n as_o well_o as_o produce_v red_a in_o the_o tincture_n of_o chochineel_n its_o operation_n may_v be_v uniform_a enough_o since_o as_o crimson_a seem_v to_o be_v little_a else_o than_o a_o very_a deep_a red_a with_o perhaps_o a_o eye_n of_o blue_n so_o some_o kind_n of_o red_a seem_v as_o i_o have_v late_o note_v to_o be_v little_a else_o than_o heighten_v yellow_a and_o consequent_o in_o such_o body_n the_o yellow_a seem_v to_o be_v but_o a_o diluted_a red._n and_o according_o alcalizate_a solution_n and_o urinous_a spirit_n which_o seem_v dispose_v to_o deepen_v the_o colour_n of_o the_o juice_n and_o liquor_n of_o most_o vegetable_n will_v not_o only_o restore_v the_o solution_n of_o cochineel_n and_o the_o infusion_n of_o brazil_n to_o the_o crimson_a whence_o the_o spirit_n of_o salt_n have_v change_v they_o into_o a_o true_a red_a but_o will_v also_o as_o i_o late_o tell_v you_o not_o
instanced_a in_o the_o whiteness_n of_o froth_n and_o in_o the_o mixture_n of_o dry_a colour_a powder_n 30._o a_o further_a explication_n of_o the_o variety_n that_o may_v be_v in_o the_o superficial_a part_n of_o colour_a body_n that_o may_v cause_v that_o effect_n by_o a_o example_n draw_v from_o the_o surface_n of_o the_o earth_n 31._o a_o apology_n for_o that_o gross_a comparison_n 32._o that_o the_o appearance_n of_o the_o superficial_a asperity_n may_v be_v vary_v from_o the_o position_n of_o the_o eye_n and_o several_a instance_n give_v of_o such_o appearance_n 33_o 34_o 35._o that_o the_o appearance_n of_o the_o superficial_a particle_n may_v be_v vary_v also_o by_o their_o motion_n confirm_v by_o a_o instance_n of_o the_o smoke_a liquor_n 35._o especial_o if_o the_o superficial_a part_n be_v of_o such_o a_o nature_n as_o to_o appear_v divers_a in_o several_a posture_n explain_v by_o the_o variety_n of_o colour_n exhibit_v by_o the_o shake_a leave_n of_o some_o plant_n 36._o and_o by_o changeable_a taffity_n 37_o 38_o 39_o the_o author_n wish_v that_o the_o variety_n of_o colour_n in_o mother_n of_o pearl_n be_v examine_v with_o a_o microscope_n 40._o and_o his_o conjecture_n that_o possible_o good_a microscope_n may_v discover_v those_o superficial_a inequality_n to_o be_v real_a which_o we_o now_o only_o imagine_v with_o his_o reason_n draw_v partly_o from_o the_o discovery_n of_o the_o telescope_n and_o microscope_n 41._o and_o partly_o also_o from_o the_o prodigious_o strange_a example_n of_o a_o blind_a man_n that_o can_v feel_v colour_n 42._o who_o history_n be_v relate_v 43_o 44_o 45._o the_o author_n conjecture_n and_o thought_n of_o it_o 46_o 47_o 48_o 49._o and_o several_a conclusion_n and_o corollary_n draw_v from_o it_o about_o the_o nature_n of_o blackness_n and_o black_a body_n 50_o 51_o 52._o and_o about_o the_o asperity_n of_o several_a other_o colour_a body_n 53._o and_o from_o these_o and_o some_o premised_a consideration_n be_v propose_v some_o conjecture_n that_o the_o reason_n of_o the_o several_a phaenomena_n of_o colour_n afterward_o to_o be_v meet_v with_o depend_v upon_o the_o disposition_n of_o the_o see_v part_n of_o the_o object_n 54._o that_o liquor_n may_v alter_v the_o colour_n of_o each_o other_o and_o of_o other_o body_n first_o by_o their_o insinuate_a themselves_o into_o the_o pore_n and_o fill_v they_o whence_o the_o asperity_n of_o the_o surface_n of_o a_o body_n become_v alter_v explicate_v with_o some_o instance_n 55_o 56._o next_o by_o remove_v those_o body_n which_o before_o hinder_v the_o appearance_n of_o the_o genuine_a colour_n confirm_v by_o several_a example_n 57_o three_o by_o make_v a_o fissure_n or_o separation_n either_o in_o the_o contiguous_a or_o continue_a particle_n of_o a_o body_n 58._o four_o by_o a_o union_n or_o conjunction_n of_o the_o former_o separate_a particle_n illustrate_v with_o divers_a instance_n of_o precipitate_v body_n 59_o five_o by_o dislocate_a the_o part_n and_o put_v they_o both_o into_o other_o order_n and_o posture_n which_o be_v illustrate_v with_o instance_n 60_o 61._o six_o by_o motion_n which_o be_v explain_v 62._o and_o last_o and_o chief_o by_o the_o union_n of_o the_o saline_n body_n with_o the_o superficial_a part_n of_o another_o body_n whereby_o both_o their_o bigness_n and_o shape_n must_v necessary_o be_v alter_v 63_o 64._o explain_v by_o experiment_n 65_o 66._o that_o the_o colour_n of_o body_n may_v be_v change_v by_o the_o concurrence_n of_o two_o or_o more_o of_o these_o way_n 67._o and_o beside_o all_o these_o eight_o reflective_a cause_n of_o colour_n there_o may_v be_v in_o transparent_a body_n several_a refractive_a 68_o 69._o why_o the_o author_n think_v the_o nature_n of_o colour_n deserve_v yet_o a_o further_a inquiry_n 69._o first_o for_o that_o the_o little_a mote_n of_o dust_n exhibit_v very_o lovely_a colour_n in_o a_o darken_a room_n whilst_o in_o a_o convenient_a posture_n to_o the_o eye_n which_o in_o other_o posture_n and_o light_n they_o do_v not_o 70._o and_o that_o though_o the_o small_a part_n of_o some_o colour_a body_n be_v transparent_a yet_o of_o other_o they_o be_v not_o so_o that_o the_o first_o doubt_n whether_o the_o superficial_a part_n create_v those_o colour_n and_o the_o second_o whether_o there_o be_v any_o refraction_n at_o all_o in_o the_o late_a 71_o 72_o 73._o a_o famous_a controversy_n among_o philosopher_n about_o the_o nature_n of_o colour_n decide_v 74._o 75._o chap._n 4._o the_o controversy_n state_v about_o real_a and_o emphatical_a colour_n 75_o 76._o that_o the_o great_a disparity_n between_o they_o seem_v to_o be_v partly_o their_o duration_n in_o the_o same_o state_n and_o partly_o that_o genuine_a colour_n be_v produce_v in_o opacous_a body_n by_o reflection_n and_o emphatical_a in_o transparent_a by_o refraction_n 78._o but_o that_o this_o be_v not_o to_o be_v take_v in_o too_o large_a a_o sense_n the_o cautionary_a instance_n of_o froth_n be_v allege_v and_o insist_v on_o 78_o 79._o that_o the_o duration_n be_v not_o a_o sufficient_a characteristick_n exemplify_v by_o the_o duration_n of_o froth_n and_o other_o emphatical_a colour_n and_o the_o sudden_a fade_a of_o flower_n and_o other_o body_n of_o real_a one_o 80._o that_o the_o position_n of_o the_o eye_n be_v not_o necessary_a to_o the_o discern_a emphatical_a colour_n show_v by_o the_o see_v white_a froth_n or_o a_o iris_n cast_v on_o the_o wall_n by_o a_o prism_n in_o what_o place_n of_o the_o room_n soever_o the_o eye_n be_v 81._o which_o proceed_v from_o the_o specular_a reflection_n of_o the_o wall_n 82._o that_o emphatical_a colour_n may_v be_v compound_v and_o that_o the_o present_a discourse_n be_v not_o much_o concern_v whether_o there_o be_v or_o be_v not_o make_v a_o distinction_n between_o real_a and_o emphatical_a colour_n 83._o chap._n 5._o six_o hypothesis_n about_o colour_n recite_v 84_o 85_o why_o the_o author_n can_v more_o full_o speak_v of_o any_o of_o these_o 86._o nor_o acquiesce_v in_o they_o 87_o 88_o what_o pyrophilus_n be_v to_o expect_v in_o this_o treatise_n 88_o 89._o what_o hypothesis_n of_o light_n and_o colour_n the_o author_n most_o incline_v too_o 90._o why_o he_o think_v neither_o that_n nor_o any_o other_o sufficient_a and_o what_o his_o difficulty_n be_v that_o make_v he_o decline_v all_o hypothesis_n and_o to_o think_v it_o very_o difficult_a to_o stick_v to_o any_o 91_o 92._o part_v the_o second_o of_o the_o nature_n of_o whiteness_n and_o blackness_n chap._n i._n the_o reason_n why_o the_o author_n choose_v the_o explication_n of_o whiteness_n and_o blackness_n 93._o wherein_o democritus_n think_v amiss_o of_o these_o 94._o gassendus_fw-la his_o opinion_n about_o they_o 95._o what_o the_o author_n approve_v and_o a_o more_o full_a explication_n of_o white_a make_v it_o a_o multiplicity_n of_o light_n or_o reflection_n 96_o 97._o confirm_a first_o by_o the_o whiteness_n of_o the_o meridian_n sun_n observe_v in_o water_n 98._o and_o of_o a_o piece_n of_o iron_n glow_v hot_a 99_o second_o by_o the_o offensiveness_n of_o snow_n to_o the_o traveller_n eye_n confirm_v by_o a_o example_n of_o a_o person_n that_o have_v travel_v much_o in_o russia_n 100_o and_o by_o a_o observation_n out_o of_o olaus_n magnus_n 100_o and_o that_o the_o snow_n do_v enlighten_v and_o clear_v the_o air_n in_o the_o night_n confirm_v by_o the_o moscow_n physician_n and_o captain_n james_n 101._o but_o that_o snow_n have_v no_o inherent_a light_n prove_v by_o experience_n 102._o three_o by_o the_o great_a store_n of_o reflection_n from_o white_a body_n observe_v in_o a_o darken_a room_n and_o by_o their_o unaptness_n to_o be_v kindle_v by_o a_o burning-glass_n 103._o four_o the_o specularness_n of_o white_a body_n be_v confirm_v by_o the_o reflection_n in_o a_o dark_a room_n from_o other_o body_n 104._o and_o by_o the_o appearance_n of_o a_o river_n which_o both_o to_o the_o eye_n and_o in_o a_o darken_a room_n appear_v white_a 105._o 106._o five_o by_o the_o whiteness_n of_o distil_a mercury_n and_o that_o of_o the_o galaxy_n 107_o 108._o and_o by_o the_o whiteness_n of_o froth_n raise_v from_o white_n of_o egg_n beat_v that_o this_o whiteness_n come_v not_o from_o the_o air_n show_v by_o experiment_n 109._o 110._o where_o occasional_o the_o whiteness_n of_o distil_v oil_n hot_a water_n etc._n etc._n be_v show_v 111._o that_o it_o seem_v not_o necessary_a the_o reflect_v surface_n shall_v be_v spherical_a confirm_v by_o experiment_n 112_o 113._o six_o by_o the_o whiteness_n of_o the_o powder_n of_o transparent_a body_n 114._o seven_o by_o the_o experiment_n of_o whiten_v and_o burnish_v silver_n 115._o 116._o chap._n 2._o a_o recital_n of_o some_o opinion_n about_o blackness_n and_o which_o the_o author_n incline_v to_o 117._o which_o he_o further_o insist_o on_o and_o explicate_v 118_o 119._o and_o show_v for_o what_o reason_n he_o embrace_v that_o
hypothesis_n 120._o first_o from_o the_o contrary_a nature_n of_o whiteness_n and_o blackness_n white_n reflect_v most_o beam_n outward_o black_a shall_v reflect_v most_o inward_a 120._o next_o from_o the_o black_a appearance_n of_o all_o body_n when_o shadow_a and_o the_o manner_n how_o this_o paucity_n of_o refection_n outward_o be_v cause_v be_v further_a explicate_v byshew_v that_o the_o superficial_a part_n may_v be_v conica_fw-la and_o pyramical_a 121._o this_o and_o other_o considration_n former_o deliver_v illustrate_v by_o experiment_n with_o black_a and_o white_a marble_n 122_o 123._o three_o from_o the_o black_a appearance_n of_o holes_n in_o whit_n linen_n and_o from_o the_o appearance_n of_o velvet_n stroke_v several_a way_n and_o from_o a_o observation_n of_o carrot_n 124_o 125._o four_o from_o the_o small_a reflection_n from_o black_a in_o a_o darken_a room_n 125_o 126._o five_o from_o the_o experiment_n of_o a_o chequer_v tile_n expose_v to_o the_o sunbeam_n 127._o which_o be_v to_o be_v prefer_v before_o a_o similar_v experiment_n try_v in_o italy_n with_o black_a and_o white_a marble_n 128._o some_o other_o congruous_a observation_n 129._o six_o from_o the_o roast_n blacked_a egg_n in_o the_o sun_n 130._o seven_o by_o the_o observation_n of_o the_o blind_a man_n late_o mention_v and_o of_o another_o mention_v by_o bartholine_n 130._o that_o notwithstanding_o all_o these_o reason_n the_o author_n be_v not_o absolute_o positive_a but_o remain_v yet_o a_o secker_n after_o the_o true_a nature_n of_o whiteness_n and_o blackness_n 131_o 132._o experiment_n in_o consort_n touch_v whiteness_n and_o blackness_n the_o first_o experiment_n with_o a_o solution_n of_o sublimate_n make_v white_a with_o spirit_n of_o urine_n etc._n etc._n 133_o 134._o the_o second_o experiment_n with_o a_o infusion_n of_o gall_n make_v black_a with_o vitriol_n etc._n etc._n 135_o 136_o further_o discourse_v of_o 137._o the_o three_o experiment_n of_o the_o black_n of_o hrtshorn_n and_o ivory_n and_o tartar_n and_o by_o a_o father_n calcination_n make_v they_o white_a 138_o 139._o the_o four_o experiment_n limit_v the_o chmist_n principle_n adusta_fw-la nigra_fw-la sed_fw-la perusta_fw-mi aâ—a_fw-mi by_o several_a instance_n of_o calcine_v alabaster_n lead_n antimony_n vitriol_n and_o by_o the_o testimony_n of_o bellonius_fw-la about_o the_o white_a charcoles_n of_o oxy-caedar_a and_o by_o that_o of_o camphire_n 140_o 141_o 142._o that_o which_o follow_v about_o inks_n be_v misplace_v by_o a_o error_n of_o the_o printer_n for_o it_o belong_v to_o what_o have_v be_v former_o say_v of_o gall_n 142_o 143._o the_o five_o experiment_n of_o the_o black_a smoke_n of_o camphire_n 144._o the_o six_o experiment_n of_o a_o black_a caput_fw-la mortuum_n of_o oil_n of_o vitriol_n with_o oil_n of_o wormwood_n and_o also_o with_o oil_n of_o winter-savory_n 145._o the_o seven_o experiment_n of_o whiten_a wax_n 146._o the_o eight_o experiment_n with_o tin-glass_n and_o sublimate_n 147_o 148._o the_o nine_o experiment_n of_o a_o black_a powder_n of_o gold_n in_o the_o bottom_n of_o aquafortis_n and_o of_o the_o black_n of_o refine_v gold_n and_o silver_n 148_o 149._o the_o ten_o experiment_n of_o the_o stain_a hair_n skin_n ivory_n etc._n etc._n black_a with_o crystal_n of_o silver_n 150_o 151._o the_o eleven_o experiment_n about_o the_o blackness_n of_o the_o skin_n and_o hair_n of_o negro_n and_o inhabitant_n of_o hot_a climate_n several_a objection_n be_v make_v and_o the_o whole_a matter_n more_o full_o discourse_v and_o state_v from_o several_a notable_a history_n and_o observation_n from_o the_o 151_o to_o the_o 167._o the_o twelve_o experiment_n of_o the_o white_a powder_n afford_v by_o precipitate_v several_a body_n as_o crab_n eye_n minium_n coral_n silver_n lead_v tin_n quicksilver_n tin-glass_n antimony_n benzoin_v and_o resinous_n gum_n out_o of_o spirit_n of_o wine_n etc._n etc._n but_o this_o be_v not_o universal_a since_o other_o body_n as_o gold_n antimony_n quicksilver_n etc._n etc._n may_v be_v precipitate_v of_o other_o colour_n 168_o 169_o 170._o the_o thirteen_o experiment_n of_o change_a the_o blackness_n of_o some_o body_n into_o other_o colour_n 171_o 172._o and_o of_o whiten_v what_o will_v be_v minium_n and_o copper_n with_o tin_n and_o of_o copper_n with_o arsenic_n which_o with_o coppil_v again_o vanish_v of_o cover_v the_o colour_n of_o that_o of_o â…”_n of_o gold_n with_o â…”_n of_o silver_n melt_v in_o a_o mass_n together_o 173_o 174._o the_o fourteen_o experiment_n of_o turn_v the_o black_a body_n of_o horn_n into_o a_o white_a immediate_o with_o scrape_v without_o change_v the_o substantial_a form_n or_o without_o the_o intervention_n of_o salt_n sulphur_n or_o mercury_n 176._o the_o fifteen_o experiment_n contain_v several_a instance_n against_o the_o opinion_n of_o the_o chemist_n that_o sulphur_n adust_a be_v the_o cause_n of_o blackness_n and_o the_o whole_a matter_n be_v full_o discuss_v and_o state_v from_o 176_o to_o 184._o part_v the_o three_o concern_v fromiscuous_a experiment_n about_o colour_n experiment_n the_o first_o in_o confirmation_n of_o a_o former_a conjecture_n about_o the_o generation_n of_o colour_n from_o diversity_n of_o reflection_n be_v set_v down_o several_a observation_n make_v in_o a_o darken_a room_n 186_o 187._o experiment_n the_o second_o that_o white_a linen_n seem_v tinge_v with_o the_o red_a of_o silk_n place_v near_o it_o in_o a_o light_a room_n 188_o 189._o experiment_n the_o three_o of_o the_o trajection_n of_o light_n through_o colour_a paper_n 189_o 190._o experiment_n the_o four_o observation_n of_o a_o prism_n in_o a_o dark_a room_n 191_o 192._o experiment_n the_o five_o of_o the_o refract_n and_o reflect_v prismatical_a colour_n in_o a_o light_a room_n 193._o experiment_n the_o six_o of_o the_o vanish_v of_o the_o iris_n of_o the_o prism_n upon_o the_o access_n of_o a_o great_a adventitious_a light_n 194._o experiment_n the_o seven_o of_o the_o appearance_n of_o the_o same_o colour_a paper_n by_o candle-light_n 195_o 196._o experiment_n the_o eight_o of_o the_o yellowness_n of_o the_o flame_n of_o a_o candle_n 197._o experiment_n the_o nine_o of_o the_o greenish_a blue_a transparency_n of_o leaf_n gold_n 198._o experiment_n the_o ten_o of_o the_o curious_a tincture_n afford_v by_o lignum_fw-la nephriticum_fw-la from_o 199_o to_o 203._o several_a trial_n for_o the_o investigation_n of_o the_o nature_n of_o it_o from_o 204_o to_o 206._o kircher_n '_o s_o relation_n of_o this_o wood_n set_v down_o and_o examine_v from_o 206_o to_o 212._o a_o corollary_n on_o this_o ten_o experiment_n show_v how_o it_o may_v be_v applicable_a for_o the_o discover_v whether_o any_o salt_n be_v of_o a_o acid_n or_o a_o sulphureous_a and_o alcalizate_a nature_n from_o 213_o to_o 216._o the_o eleven_o experiment_n of_o certain_a piece_n of_o glass_n that_o afford_v this_o variety_n of_o colour_n and_o of_o the_o way_n of_o so_o ting_a any_o plate_n of_o glass_n with_o silver_n from_o 216_o to_o 219._o the_o twelve_o experiment_n of_o the_o mix_v and_o temper_v of_o painter_n pigment_n 219_o 220_o 221._o the_o thirteen_o experiment_n of_o compound_v several_a colour_n by_o traject_v the_o sunbeam_n through_o tinged_a glass_n from_o 221_o to_o 224._o the_o fourteen_o experiment_n of_o the_o compound_v of_o real_a and_o fantastical_a colour_n and_o the_o result_v 224_o 225_o 226._o as_o also_o the_o same_o of_o fantastical_a colour_n 226_o 227._o the_o fifteen_o experiment_n of_o vary_v the_o trajected_a iris_n by_o a_o colour_a prism_n 228_o 229._o the_o sixteen_o experiment_n of_o the_o red_a fume_n of_o spirit_n of_o nitre_n and_o the_o resemble_v redness_n of_o the_o horizontal_a sunbeam_n 230_o 231._o the_o seventeen_o experiment_n of_o make_v a_o green_a by_o nine_o kind_n of_o composition_n from_o 231_o to_o 236._o and_o some_o deduction_n from_o they_o against_o the_o necessity_n of_o recur_v to_o substantial_a form_n and_o hypostatical_a principle_n for_o the_o production_n of_o colour_n from_o 237_o to_o 240._o the_o eighteen_o experiment_n of_o several_a composition_n of_o blue_n and_o yellow_a which_o produce_v not_o a_o green_a and_o of_o the_o production_n of_o a_o green_a by_o other_o colour_n 241_o 242._o the_o nineteen_o experiment_n contain_v several_a instance_n of_o produce_v colour_n without_o the_o alteration_n of_o any_o hypostatical_a principle_n by_o the_o prism_n bubble_n and_o feather_n from_o 242_o to_o 245._o the_o twenty_o experiment_n of_o turn_v the_o blue_n of_o violet_n into_o a_o red_a by_o acid_n salt_n and_o to_o a_o green_a by_o alcalizate_n 245_o 246._o and_o the_o use_n of_o it_o for_o investigate_a the_o nature_n of_o salt_n 247_o 248._o the_o one_o and_o twenty_o experiment_n of_o the_o same_o change_v effect_v by_o the_o same_o mean_n on_o the_o blue_a tincture_n of_o corn-flower_n 249_o 250._o and_o some_o restriction_n to_o show_v it_o not_o to_o be_v so_o general_a a_o propriety_n as_o one_o may_v imagine_v 251._o the_o twenty_o
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other_o 14._o and_o perhaps_o pyrophilus_n it_o may_v prove_v some_o illustration_n of_o what_o i_o mean_v and_o help_v you_o to_o conceive_v how_o this_o may_v be_v if_o i_o represent_v that_o where_o the_o particle_n be_v so_o exceed_v slender_n we_o may_v allow_v the_o part_n expose_v to_o the_o sight_n and_o touch_n to_o be_v a_o little_a convex_a in_o comparison_n of_o the_o erect_v particle_n of_o black_a body_n as_o if_o there_o be_v wire_n i_o know_v not_o how_o many_o time_n slendere_a than_o a_o hair_n whether_o you_o suppose_v they_o to_o be_v figure_v like_o needle_n or_o cylindrical_o like_o the_o hair_n of_o a_o brush_n with_o hemisphaerical_a or_o at_o least_o convex_a top_n they_o will_v be_v so_o very_a slender_n and_o consequent_o the_o point_n both_o of_o the_o one_o sort_n and_o the_o other_o so_o very_o sharp_a that_o even_o a_o exquisite_a touch_n will_v be_v able_a to_o distinguish_v no_o great_a difference_n between_o they_o than_o that_o which_o our_o blind_a 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so_o do_v it_o turn_v the_o pitta_n di_fw-it crystalio_n as_o the_o glassman_n call_v the_o matter_n of_o the_o pure_a sort_n of_o glass_n wherewith_o it_o be_v colliquate_v into_o a_o white_a mass_n which_o if_o it_o be_v opacous_a enough_o be_v employ_v as_o we_o elsewhere_o declare_v for_o white_a amel._n but_o of_o the_o colour_n which_o the_o other_o metal_n may_v be_v make_v to_o produce_v in_o colourless_a glass_n and_o other_o vitrifiable_a body_n that_o have_v native_a colour_n of_o their_o own_o i_o must_v leave_v you_o to_o inform_v you_o self_n upon_o trial_n or_o at_o least_o must_v forbear_v to_o do_v it_o till_o another_o time_n consider_v how_o many_o annotation_n be_v to_o follow_v upon_o what_o have_v in_o this_o and_o the_o two_o former_a experiment_n be_v say_v already_o annotation_n i._n when_o the_o material_n of_o glass_n be_v melt_v with_o calcine_v tin_n have_v compose_v a_o mass_n undiaphanous_a and_o white_a this_o white_a amel_n be_v as_o it_o be_v the_o 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