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a_o dark_a and_o dirty_a one_o like_o that_o of_o iron_n that_o have_v be_v long_o keep_v in_o the_o air._n and_o have_v take_v some_o piece_n of_o agate_n pretty_o enough_o adorn_v with_o wave_n of_o differ_v colour_n and_o keep_v they_o a_o competent_a time_n for_o they_o shall_v not_o be_v keep_v too_o long_o in_o the_o fire_n i_o find_v as_o i_o conjecture_v that_o the_o great_a part_n of_o the_o agate_n seem_v to_o be_v deprive_v of_o its_o tincture_n be_v reduce_v to_o a_o pleasant_a whiteness_n but_o in_o some_o place_n where_o there_o be_v stain_n of_o a_o differ_a kind_n from_o the_o rest_n and_o where_o there_o run_v little_a vein_n that_o i_o guess_v to_o be_v of_o a_o metalline_a nature_n there_o i_o say_v the_o colour_n be_v not_o destroy_v but_o change_v and_o the_o vein_n of_o pigment_n thus_o colour_v acquire_v a_o deep_a redness_n which_o they_o will_v retain_v if_o let_v â—lone_o though_o i_o be_v induce_v to_o think_v by_o some_o trial_n make_v on_o other_o piece_n 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find_v in_o the_o territory_n of_o modena_n to_o bring_v this_o home_n to_o our_o purpose_n since_o there_o be_v mineral_n exhalation_n of_o very_a differ_a kind_n disperse_v in_o divers_a place_n under_o ground_n and_o since_o there_o be_v several_a volatile_a mineral_n as_o arsenic_n orpiment_n sandarach_n etc._n etc._n that_o be_v very_o active_o hurtful_a there_o may_v be_v other_o endow_v with_o medicinal_a quality_n and_o the_o exhalation_n of_o such_o mineral_n either_o alone_o or_o mix_v with_o petrescent_a liquor_n pervade_v due_o dispose_v earth_n and_o bolusses_n and_o other_o fluid_a soft_a or_o open_a substance_n before_o their_o induration_n may_v endow_v they_o with_o medicinal_a and_o other_o quality_n nay_o when_o i_o recall_v to_o mind_v the_o old_a phaenomena_n that_o i_o have_v partly_o observe_v and_o partly_o receive_v from_o credible_a testimony_n about_o the_o coalition_n mixture_n tincture_n and_o the_o emanation_n as_o it_o be_v of_o those_o tincture_n in_o 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last_o thing_n that_o i_o shall_v represent_v to_o show_v that_o the_o virtue_n of_o opacous_a gem_n and_o medicinal_a stone_n may_v be_v more_o easy_o than_o those_o of_o transparent_a one_o account_v for_o in_o our_o hypothesis_n be_v this_o that_o the_o main_a ingredient_n whereof_o many_o such_o opacous_a stone_n consist_v be_v complete_a mineral_n body_n before_o they_o become_v stone_n some_o of_o they_o have_v be_v medicinal_a bolusses_n or_o the_o like_a earth_n some_o earth_n abound_a with_o metalline_a or_o mineral_n juice_n some_o oar_n of_o metal_n or_o mineral_n of_o kin_n to_o metal_n and_o some_o in_o fine_a body_n of_o other_o sort_n or_o nature_n differ_v from_o these_o and_o one_o a_o other_o for_o all_o these_o several_a kind_n of_o fossil_n may_v by_o the_o superven_a and_o pervasion_n of_o petrific_a spirit_n be_v turn_v into_o stone_n and_o consequent_o retain_v many_o of_o the_o virtue_n they_o be_v endow_v with_o by_o the_o mineral_n corpuscle_n that_o have_v 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may_v be_v make_v or_o imitate_v by_o humane_a skill_n it_o may_v seem_v very_o improbable_a to_o many_o that_o body_n so_o near_o of_o kin_n to_o artificial_a one_o shall_v be_v endow_v with_o such_o peculiar_a and_o some_o of_o they_o with_o such_o strange_a virtue_n as_o be_v ascribe_v to_o divers_a gem_n and_o be_v think_v to_o be_v capable_a of_o flow_v only_o from_o certain_a substantial_a form_n and_o those_o very_a noble_a one_o too_o to_o this_o i_o may_v reply_v that_o i_o admit_v not_o any_o such_o imaginary_a being_n as_o the_o peripatetic_a form_n which_o i_o fear_v they_o will_v never_o be_v able_a to_o demonstrate_v but_o to_o avoid_v unnecessary_a dispute_n i_o will_v rather_o answer_v in_o short_a that_o such_o composition_n as_o be_v call_v artificial_a may_v for_o all_o that_o be_v endow_v with_o great_a virtue_n and_o such_o as_o be_v call_v specific_a witness_v the_o virtue_n of_o many_o chemical_a preparation_n even_o of_o those_o that_o be_v use_v by_o 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