upon_o a_o power_n that_o certain_a body_n have_v to_o cause_n precipitation_n and_o some_o upon_o such_o a_o disposition_n to_o be_v strike_v down_o by_o other_o as_o may_v if_o man_n please_v be_v call_v precipitability_n and_o so_o these_o differ_a affection_n may_v with_o at_o least_o tolerable_a congruity_n be_v refer_v to_o those_o that_o we_o have_v elsewhere_o style_v chemical_a quality_n but_o though_o i_o hope_v i_o may_v in_o these_o few_o line_n have_v say_v enough_o concern_v the_o name_n give_v to_o these_o attribute_n yet_o perhaps_o it_o will_v be_v find_v in_o time_n that_o the_o thing_n themselves_o may_v deserve_v a_o large_a discourse_n than_o my_o little_a leisure_n will_v allow_v they_o for_o that_o be_v not_o a_o causeless_a intimation_n of_o the_o importance_n of_o the_o subject_n wherewith_o i_o conclude_v the_o follow_a tract_n since_o beside_o that_o many_o more_o instance_n may_v have_v be_v particular_o refer_v to_o the_o head_n treat_v of_o in_o the_o ensue_a essay_n there_o be_v improper_a kind_n of_o precipitation_n beside_o those_o mention_v in_o the_o former_a part_n of_o the_o discourse_n to_o which_o one_o may_v not_o incongruous_o refer_v divers_a of_o the_o phaenomena_n of_o nature_n as_o well_o in_o the_o great_a as_o in_o the_o lesser_a world_n whereof_o either_o no_o cause_n at_o all_o or_o but_o improper_a one_o be_v wont_n to_o be_v give_v and_o beside_o the_o simple_a spirit_n and_o salt_n usual_o employ_v by_o chemist_n there_o be_v many_o compound_v and_o decompound_v body_n not_o only_o factitious_a but_o natural_a and_o some_o such_o as_o one_o will_v scarce_o suspect_v that_o may_v in_o congruous_a subject_n produce_v such_o precipitation_n as_o i_o speak_v of_o and_o the_o phaenomena_n and_o consequent_n of_o such_o operation_n may_v in_o divers_a case_n prove_v conducive_a both_o to_o the_o discovery_n of_o physical_a cause_n and_o the_o production_n of_o useful_a effect_n though_o the_o particularise_v of_o such_o phaenomena_n do_v rather_o belong_v to_o a_o history_n of_o precipitation_n than_o to_o such_o a_o discourse_n as_o that_o which_o follow_v wherein_o i_o propose_v not_o so_o much_o to_o deliver_v the_o latent_fw-la mystery_n as_o to_o investigate_v the_o mechanical_a cause_n of_o precipitation_n of_o the_o mechanical_a cause_n of_o chemical_a precipitation_n chap._n i._n by_o precipitation_n be_v here_o mean_v such_o a_o agitation_n or_o motion_n of_o a_o heterogeneous_a liquor_n as_o in_o no_o long_a time_n make_v the_o part_n of_o it_o subside_o and_o that_o usual_o in_o the_o form_n of_o a_o powder_n or_o other_o consistent_a body_n as_o on_o many_o occasion_n chemist_n call_v the_o substance_n that_o be_v make_v to_o fall_v to_o the_o bottom_n of_o the_o liquor_n the_o precipitate_v so_o for_o brevity_n sake_n we_o shall_v call_v the_o body_n that_o be_v put_v into_o the_o liquor_n to_o procure_v that_o subside_v the_o precipitant_n as_o also_o that_o which_o be_v to_o be_v strike_v down_o the_o precipitable_a substance_n or_o matter_n and_o the_o liquor_n wherein_o it_o swim_v before_o the_o separation_n the_o menstruum_fw-la or_o solvent_a when_o a_o hasty_a fall_n of_o a_o heterogeneous_a body_n be_v procure_v by_o a_o precipitant_n the_o operation_n be_v call_v precipitation_n in_o the_o proper_a or_o strict_a sense_n but_o when_o the_o separation_n be_v make_v without_o any_o such_o addition_n or_o the_o substance_n separate_v from_o the_o fluid_a part_n of_o the_o liquor_n instead_o of_o subside_v emerge_n than_o the_o word_n be_v use_v in_o a_o more_o comprehensive_a but_o less_o proper_a acceptation_n as_o for_o the_o cause_n of_o precipitation_n the_o very_a name_n itself_o in_o its_o chemical_a sense_n have_v be_v scarce_o hear_v of_o in_o the_o peripatetic_a school_n it_o be_v not_o to_o be_v expect_v that_o they_o shall_v have_v give_v a_o account_n of_o the_o reason_n of_o the_o thing_n and_o it_o be_v like_a that_o those_o few_o aristotelian_o that_o have_v by_o their_o converse_n with_o the_o laboratory_n or_o write_n of_o chemist_n take_v notice_n of_o this_o operation_n will_v according_a to_o their_o custom_n on_o such_o occasion_n have_v recourse_n for_o the_o explication_n of_o it_o to_o some_o secret_a sympathy_n or_o antipathy_n between_o the_o body_n who_o action_n and_o reaction_n intervene_v in_o this_o operation_n but_o if_o this_o be_v the_o way_n propose_v of_o account_v for_o it_o i_o shall_v quick_o have_v occasion_n to_o say_v somewhat_o to_o it_o in_o consider_v the_o way_n propose_v by_o the_o chemist_n who_o be_v wont_a to_o refer_v precipitation_n either_o as_o be_v most_o usual_a to_o a_o sympathy_n betwixt_o the_o precipitate_v body_n and_o the_o menstruum_fw-la which_o make_v the_o solvent_a run_v to_o the_o embrace_n of_o the_o precipitant_n and_o so_o let_v fall_v the_o particle_n of_o the_o body_n sustain_v before_o or_o with_o other_o to_o a_o great_a antipathy_n or_o contrariety_n between_o the_o acid_a salt_n of_o the_o menstruum_fw-la and_o the_o fix_a salt_n of_o the_o oil_n or_o solution_n of_o calcine_v tartar_n which_o be_v the_o most_o general_a and_o usual_a precipitant_n they_o employ_v but_o i_o see_v not_o how_o either_o of_o these_o cause_n will_v either_o reach_v to_o all_o the_o phaenomena_n that_o have_v be_v exhibit_v or_o give_v a_o true_a account_n even_o of_o some_o of_o those_o to_o which_o it_o seem_v applicable_a for_o first_o in_o precipitation_n wherein_o what_o they_o call_v a_o sympathy_n between_o the_o liquor_n be_v suppose_v to_o produce_v the_o effect_n this_o admire_a sympathy_n do_v not_o in_o my_o apprehension_n evince_v such_o a_o mysterious_a occult_a quality_n as_o be_v presume_v but_o rather_o consist_v in_o a_o great_a congruity_n as_o to_o bigness_n shape_n motion_n and_o pore_n of_o the_o minute_n part_n between_o the_o menstruum_fw-la and_o the_o precipitant_n than_o between_o the_o same_o solvent_a and_o the_o body_n it_o keep_v before_o dissolve_v and_o though_o this_o sympathy_n right_o explain_v may_v be_v allow_v to_o have_v a_o interest_n in_o some_o such_o precipitation_n as_o let_v fall_v the_o dissolve_a body_n in_o its_o pristine_a nature_n and_o form_n and_o only_o reduce_v into_o minute_n powder_n yet_o i_o find_v not_o that_o in_o the_o generality_n of_o precipitation_n this_o doctrine_n will_v hold_v for_o in_o some_o that_o we_o have_v make_v of_o gold_n and_o silver_n in_o proper_a menstruum_n after_o the_o subside_v matter_n have_v be_v well_o wash_v and_o dry_v several_a precipitate_v of_o gold_n make_v some_o with_o oil_n of_o tartar_n which_o abound_v with_o a_o fix_a salt_n and_o be_v the_o usual_a precipitant_n and_o some_o with_o a_o urinous_a spirit_n which_o work_v by_o virtue_n of_o a_o salt_n high_o fugitive_a or_o volatile_a i_o find_v the_o powder_n to_o exceed_v the_o weight_n of_o the_o gold_n and_o silver_n i_o have_v put_v to_o dissolve_v and_o the_o eye_n itself_o sufficient_o discover_v such_o precipitate_v not_o to_o be_v mere_a metalline_a powder_n but_o composition_n who_o consist_v not_o as_o have_v be_v by_o some_o body_n suspect_v of_o the_o combine_a salt_n alone_o but_o of_o the_o metalline_a part_n also_o may_v be_v strong_o conclude_v not_o only_o from_o the_o ponderousness_n of_o divers_a of_o they_o in_o reference_n to_o their_o bulk_n but_o also_o manifest_o from_o the_o reduction_n of_o true_a malleable_a metal_n from_o several_a of_o they_o chap._n ii_o the_o other_o chemical_a way_n of_o explicate_a precipitation_n may_v in_o a_o right_a sense_n be_v make_v use_n of_o by_o a_o naturalist_n on_o some_o particular_a occasion_n but_o i_o think_v it_o much_o too_o narrow_a and_o defective_a as_o it_o be_v in_o a_o general_a way_n propose_v to_o be_v fit_a to_o be_v acquiesce_v in_o for_o first_o it_o be_v plain_a that_o it_o be_v not_o only_a salt_n of_o tartar_n and_o other_o fix_a alcaly_n that_o precipitate_v most_o body_n that_o be_v dissolve_v in_o acid_a menstruum_n as_o in_o make_v of_o aurum_fw-la fulminans_fw-la oil_n of_o tartar_n precipitate_v the_o gold_n out_o of_o aqua_fw-la regis_fw-la but_o acid_a liquor_n themselves_o do_v on_o many_o occasion_n no_o less_o powerful_o precipitate_v metal_n and_o other_o body_n out_o of_o one_o another_o thus_o spirit_n of_o salt_n as_o i_o have_v often_o try_v precipitate_v silver_n out_o of_o aqua_fw-la fortis_fw-la the_o corrosive_a spirit_n of_o nitre_n copious_o precipitate_v that_o white_a powder_n whereof_o they_o make_v bezoardicum_n minerale_fw-mi spirit_n or_o oil_n of_o sulphur_n make_v by_o a_o glass-bell_n precipitate_v coral_n pearl_n etc._n etc._n dissolve_v in_o spirit_n of_o vinegar_n as_o be_v know_v to_o many_o chemist_n who_o now_o use_v this_o oleum_fw-la sulphuris_fw-la per_fw-la campanam_fw-la to_o make_v the_o magistery_n of_o pearl_n etc._n etc._n for_o which_o vulgar_a chemist_n employ_v oleum_fw-la tartari_fw-la per_fw-la deliquium_fw-la i_o have_v sometime_o make_v a_o menstruum_fw-la wherein_o
nature_n of_o the_o thing_n and_o helmont_n write_n have_v be_v late_o allege_v against_o their_o hypothesis_n i_o consider_v how_o slight_a account_n they_o be_v wont_n to_o give_v we_o even_o of_o the_o familiar_a phaenomena_n of_o corrosive_a liquor_n for_o if_o for_o example_n you_o ask_v a_o vulgar_a chemist_n why_o aqua_fw-la fortis_fw-la dissolve_v silver_n and_o copper_n it_o be_v great_a odds_o but_o he_o will_v tell_v you_o it_o be_v because_o of_o the_o abundance_n of_o fret_a salt_n that_o be_v in_o it_o and_o have_v a_o cognation_n with_o the_o salt_n of_o the_o metal_n and_o if_o you_o ask_v he_o why_o spirit_n of_o salt_n dissolve_v copper_n he_o will_v tell_v you_o it_o be_v for_o the_o same_o reason_n and_o yet_o if_o you_o put_v spirit_n of_o salt_n though_o very_o strong_a to_o aqua_fw-la fortis_fw-la this_o liquor_n will_v not_o dissolve_v silver_n because_o upon_o the_o mixture_n the_o liquor_n acquire_v a_o new_a gonstitution_n as_o to_o the_o saline_n particle_n by_o virtue_n of_o which_o the_o mixture_n will_v dissolve_v instead_o of_o silver_n gold_n whence_o we_o may_v argue_v against_o the_o chemist_n that_o the_o inability_n of_o this_o compound_a liquor_n to_o work_v on_o silver_n do_v not_o proceed_v from_o its_o be_v weaken_a by_o the_o spirit_n of_o salt_n as_o well_o because_o according_a to_o they_o gold_n be_v far_o the_o more_o compact_a metal_n of_o the_o two_o and_o require_v a_o more_o potent_a menstruum_fw-la to_o work_v upon_o it_o as_o because_o this_o same_o compound_a liquor_n will_v ready_o dissolve_v copper_n and_o to_o the_o same_o purpose_n with_o this_o experiment_n i_o shall_v allege_v divers_a other_o if_o i_o think_v this_o the_o fit_a place_n wherein_o i_o can_v propose_v they_o sect_n ii_o about_o the_o mechanical_a origine_fw-la of_o corrosibility_n corrosibility_n be_v the_o quality_n that_o answer_v corrosiveness_n he_o that_o have_v take_v notice_n of_o the_o advertisement_n i_o former_o give_v about_o my_o use_n of_o the_o term_n corrosiveness_n section_n in_o these_o note_n may_v easy_o judge_v in_o what_o sense_n i_o employ_v the_o name_n of_o the_o other_o quality_n which_o whether_o you_o will_v style_v it_o opposite_a or_o conjugate_v for_o want_v of_o a_o better_a word_n i_o call_v corrosibility_n this_o corrosibility_n of_o body_n be_v as_o well_o as_o their_o corrosiveness_n a_o relative_n thing_n as_o we_o see_v that_o gold_n for_o instance_n will_v not_o be_v dissolve_v by_o aqua_fw-la fortis_fw-la but_o will_v by_o aqua_fw-la regis_fw-la whereas_o silver_n be_v not_o soluble_a by_o the_o latter_a of_o these_o menstruum_n but_o be_v by_o the_o former_a and_o this_o relative_a affection_n on_o who_o account_n a_o body_n come_v to_o be_v corrodible_a by_o a_o menstruum_fw-la seem_v to_o consist_v chief_o in_o three_o thing_n which_o all_o of_o they_o depend_v upon_o mechanical_a principle_n of_o these_o qualification_n the_o first_o be_v that_o the_o body_n to_o be_v corrode_v be_v furnish_v with_o pore_n of_o such_o a_o bigness_n and_o figure_n that_o the_o corpuscle_n of_o the_o solvent_a may_v enter_v they_o and_o yet_o not_o be_v much_o agitate_a in_o they_o without_o give_v brisk_a knock_n or_o shake_v to_o the_o solid_a part_n that_o make_v up_o the_o wall_n if_o i_o may_v so_o call_v they_o of_o the_o pore_n and_o it_o be_v for_o want_v of_o this_o condition_n that_o glass_n be_v penetrate_v in_o a_o multitude_n of_o place_n but_o not_o dissipate_v or_o dissolve_v by_o the_o incident_a beam_n of_o light_n which_o permeate_n its_o pore_n without_o any_o considerable_a resistance_n and_o though_o the_o pore_n and_o commissure_v of_o a_o body_n be_v less_o minute_n and_o capable_a of_o let_v in_o some_o grosser_n corpuscle_n yet_o if_o these_o be_v for_o want_v of_o solidity_n or_o rigidness_n too_o flexible_a or_o be_v of_o a_o figure_n incongruous_a to_o that_o of_o the_o pore_n they_o shall_v enter_v the_o dissolution_n will_v not_o ensue_v as_o it_o happen_v when_o pure_a spirit_n of_o wine_n be_v in_o the_o cold_a put_v upon_o salt_n of_o tartar_n or_o when_o aqua_n fortis_fw-la be_v put_v upon_o powder_n of_o sulphur_n the_o second_o qualification_n of_o a_o corrodible_a body_n be_v that_o its_o consistent_a corpuscle_n be_v of_o such_o a_o bulk_n and_o solidity_n as_o do_v not_o render_v they_o uncapable_a of_o be_v disjoin_v by_o the_o action_n of_o the_o insinuate_a corpuscle_n of_o the_o menstruum_fw-la agreeable_a to_o this_o and_o the_o former_a observation_n be_v the_o practice_n of_o chemist_n who_o oftentimes_o when_o they_o will_v have_v a_o body_n to_o be_v wrought_v on_o by_o a_o menstruum_fw-la otherwise_o too_o weak_a for_o it_o in_o its_o crude_a estate_n dispose_v it_o to_o receive_v the_o action_n of_o the_o menstruum_fw-la by_o previous_o open_v it_o as_o they_o speak_v that_o be_v by_o enlarge_a the_o pore_n make_v a_o comminution_n of_o the_o corpuscle_n or_o weaken_v their_o cohesion_n and_o we_o see_v that_o divers_a body_n be_v bring_v by_o fit_a preparation_n to_o be_v resoluble_a in_o liquor_n that_o will_v not_o work_v on_o they_o before_o thus_o as_o be_v late_o note_v limestone_n by_o calcination_n become_v in_o part_n dissoluble_a in_o water_n and_o some_o metalline_a calces_fw-la will_n be_v so_o wrought_v on_o by_o solvent_n as_o they_o will_v not_o be_v by_o the_o same_o agent_n if_o the_o preparation_n of_o the_o metalline_a or_o other_o body_n have_v not_o give_v they_o a_o new_a disposition_n thus_o though_o crude_a tartar_n especial_o in_o lump_n be_v very_o slow_o and_o difficult_o dissoluble_a in_o cold_a water_n yet_o when_o it_o be_v burn_v it_o may_v be_v present_o dissolve_v in_o that_o liquor_n and_o thus_o though_o the_o file_n and_o the_o calx_fw-la of_o silver_n will_v not_o be_v at_o all_o dissolve_v by_o common_a water_n or_o spirit_n of_o wine_n yet_o if_o by_o the_o interposition_n of_o the_o saline_n particle_n of_o aqua_fw-la fortis_fw-la the_o lunar_a corpuscle_n be_v so_o disjoin_v and_o suffer_v such_o a_o comminution_n as_o they_o do_v in_o crystal_n of_o lune_fw-fr the_o metal_n thus_o prepare_v and_o bring_v with_o its_o saline_n additament_n into_o a_o new_a texture_n will_v easy_o enough_o dissolve_v not_o only_o in_o water_n but_z as_o i_o have_v try_v in_o well_o rectify_v spirit_n of_o wine_n and_o the_o like_a solubility_n i_o have_v find_v in_o the_o crystal_n of_o lead_n make_v with_o spirit_n of_o verdigrease_n or_o good_a distil_a vinegar_n and_o in_o those_o of_o copper_n make_v with_o aqua_fw-la fortis_fw-la the_o last_o disposition_n to_o corrosibility_n consist_v in_o such_o a_o cohesion_n of_o the_o part_n whereof_o a_o body_n be_v make_v up_o as_o be_v not_o too_o strict_a to_o be_v superable_a by_o the_o action_n of_o the_o menstruum_fw-la this_o condition_n though_o of_o kin_n to_o the_o former_a be_v yet_o somewhat_o differ_v from_o it_o since_o a_o body_n may_v consist_v of_o part_n either_o bulky_a or_o solid_a which_o yet_o may_v touch_v one_o another_o in_o such_o small_a portion_n of_o their_o surface_n as_o to_o be_v much_o more_o easy_o dissociable_a than_o the_o minute_n or_o less_o solid_a part_n of_o another_o body_n who_o contact_n be_v more_o full_a and_o close_o and_o so_o their_o cohesion_n more_o strict_a by_o what_o have_v be_v say_v it_o may_v seem_v probable_a that_o as_o i_o former_o intimate_v the_o corrosibility_n of_o body_n be_v but_o a_o mechanical_a relation_n result_v from_o the_o mechanical_a affectious_a and_o contexture_n of_o its_o part_n as_o they_o intercept_v pore_n of_o such_o size_n and_o figure_n as_o make_v they_o congruous_a to_o those_o of_o the_o corpuscle_n of_o the_o menstruum_fw-la that_o be_v to_o pierce_v between_o they_o and_o disjoin_v they_o that_o the_o quality_n that_o dispose_v the_o body_n it_o affect_v to_o be_v dissolve_v by_o corrosive_n and_o other_o menstruum_n do_v as_o have_v be_v declare_v in_o many_o case_n depend_v upon_o the_o mechanical_a texture_n and_o affection_n of_o the_o body_n in_o reference_n to_o the_o menstruum_fw-la that_o be_v to_o work_v upon_o it_o may_v be_v make_v very_o probable_a by_o what_o we_o be_v in_o due_a place_n to_o deliver_v concern_v the_o pore_n of_o body_n and_o figure_n of_o corpuscle_n but_o yet_o in_o compliance_n with_o the_o design_n of_o these_o note_n and_o agreeable_o to_o my_o custom_n on_o other_o subject_n i_o shall_v subjoin_v a_o few_o experiment_n on_o this_o occasion_n also_o exper._n i._n if_o we_o put_v high_o rectify_v spirit_n of_o wine_n upon_o crude_a sulphur_n or_o even_a flower_n of_o sulphur_n the_o liquor_n will_v lie_v quiet_o thereon_o especial_o in_o the_o cold_a for_o many_o hour_n and_o day_n without_o make_v any_o visible_a solution_n of_o it_o and_o if_o such_o exact_o dephlegm_v spirit_n be_v put_v on_o very_o dry_a salt_n of_o tartar_n the_o salt_n will_v lie_v in_o a_o
of_o the_o motion_n of_o the_o flame_n upward_o may_v render_v it_o very_o difficult_a for_o the_o electrical_a emanation_n to_o divert_v the_o flame_n from_o its_o course_n 10._o we_o have_v find_v by_o experiment_n that_o a_o vigorous_a and_o well_o excite_a piece_n of_o amber_n will_v draw_v not_o only_o the_o powder_n of_o amber_n but_o less_o minute_n fragment_n of_o it_o and_o as_o in_o many_o case_n one_o contrary_a direct_v to_o another_o so_o this_o trial_n suggest_v a_o further_a which_o in_o case_n of_o good_a success_n will_v probable_o argue_v that_o in_o electrical_a attraction_n not_o only_a effluvia_fw-la be_v emit_v by_o the_o electrical_a body_n but_o these_o effluvia_fw-la fasten_v upon_o the_o body_n to_o be_v draw_v and_o that_o in_o such_o a_o way_n that_o the_o intervening_a viscous_a string_n which_o may_v be_v suppose_v to_o be_v make_v up_o of_o those_o cohere_a effluvia_fw-la be_v when_o their_o agitation_n cease_v contract_v or_o make_v to_o shrink_v inward_o towards_o both_o end_n almost_o as_o a_o high_o stretch_v lutestring_n do_v when_o it_o be_v permit_v to_o retreat_n into_o short_a dimension_n but_o the_o conjecture_n itself_o be_v much_o more_o easy_a to_o be_v make_v than_o the_o experiment_n requisite_a to_o examine_v it_o for_o we_o find_v it_o no_o easy_a matter_n to_o suspend_v a_o electric_n great_a and_o vigorous_a enough_o in_o such_o a_o manner_n that_o it_o may_v whilst_o suspend_v be_v excite_v and_o be_v so_o nice_o poise_v that_o so_o faint_a a_o force_n as_o that_o wherewith_o it_o attract_v light_a body_n shall_v be_v able_a to_o procure_v a_o lccal_a motion_n to_o the_o whole_a body_n itself_o but_o after_o some_o fruitless_a attempt_n with_o other_o electrick_n i_o have_v recourse_n to_o the_o very_a vigorous_a piece_n of_o polish_a amber_n former_o mention_v and_o when_o we_o have_v with_o the_o help_n of_o a_o little_a wax_n suspend_v it_o by_o a_o silken_a thread_n we_o chafe_v very_o well_o one_o of_o the_o blunt_a edge_n of_o it_o upon_o a_o kind_n of_o large_a pin-cushion_n cover_v with_o a_o course_n and_o black_a woollen_a stuff_n and_o then_o bring_v the_o electric_n as_o soon_o as_o we_o can_v to_o settle_v notwithstanding_o its_o hang_n free_o at_o the_o bottom_n of_o the_o string_n this_o course_n of_o rub_v on_o the_o edge_n of_o the_o amber_n we_o pitch_v upon_o for_o more_o than_o one_o reason_n for_o if_o we_o have_v chafe_v the_o flat_a side_n the_o amber_n can_v not_o have_v approach_v the_o body_n it_o have_v be_v rub_v on_o without_o make_v a_o change_n of_o place_n in_o the_o whole_a electric_n and_o which_o be_v worse_o without_o make_v it_o move_v contrary_a to_o the_o nature_n of_o heavy_a body_n somewhat_o upward_o whereas_o the_o amber_n have_v by_o reason_n of_o its_o suspension_n its_o part_n counterpoise_v by_o one_o another_o to_o make_v the_o excite_a edge_n approach_v to_o another_o body_n that_o edge_n need_v not_o at_o all_o ascend_v but_o only_o be_v move_v horizontal_o to_o which_o way_n of_o move_v the_o gravity_n of_o the_o electric_n which_o the_o string_n keep_v from_o move_v downward_o can_v be_v but_o little_a or_o no_o hindrance_n and_o agreeable_o to_o this_o we_o find_v that_o if_o as_o soon_o as_o the_o suspend_v and_o well_o rub_v electric_n be_v bring_v to_o settle_v free_o we_o apply_v to_o the_o chafe_v edge_n but_o without_o touch_v it_o the_o late_o mention_v cushion_n which_o by_o reason_n of_o its_o rough_a superficies_n and_o porosity_n be_v fit_a for_o the_o electrical_a effluvia_fw-la to_o fasten_v upon_o the_o edge_n will_v manifest_o be_v draw_v aside_o by_o the_o cushion_n steady_o hold_v and_o if_o this_o be_v slow_o remove_v will_v follow_v it_o a_o good_a way_n and_o when_o this_o body_n no_o long_o detain_v it_o will_v return_v to_o the_o posture_n wherein_o it_o have_v settle_v before_o and_o this_o power_n of_o approach_v the_o cushion_n by_o virtue_n of_o the_o operation_n of_o its_o own_o steam_n be_v so_o durable_a in_o our_o vigorous_a piece_n of_o amber_n that_o by_o once_o chafe_v it_o i_o be_v able_a to_o make_v it_o follow_v the_o cushion_n no_o less_o than_o ten_o or_o eleven_o time_n whether_o from_o such_o experiment_n one_o may_v argue_v that_o it_o be_v but_o as_o it_o be_v by_o accident_n that_o amber_n attract_v another_o body_n and_o not_o this_o the_o amber_n and_o whether_o these_o aught_o to_o make_v we_o question_n if_o electrick_n may_v with_o so_o much_o propriety_n as_o have_v be_v hitherto_o general_o suppose_v be_v say_v to_o attract_v be_v doubt_n that_o my_o design_n do_v not_o here_o oblige_v i_o to_o examine_v some_o other_o phaenomena_n may_v be_v add_v of_o the_o same_o tendency_n with_o those_o already_o mention_v as_o the_o advantage_n that_o electrical_a body_n usual_o get_v by_o have_v well_o polish_a or_o at_o least_o smooth_a surface_n but_o the_o title_n of_o this_o paper_n promise_v some_o experiment_n about_o the_o production_n of_o electricity_n i_o must_v not_o omit_v to_o recite_v how_o i_o have_v be_v sometime_o able_a to_o produce_v or_o destroy_v this_o quality_n in_o certain_a body_n by_o mean_n of_o alteration_n that_o appear_v not_o to_o be_v other_o than_o mechanical_a exper._n i._n and_o first_o have_v with_o a_o very_a mild_a heat_n slow_o evaporate_v about_o a_o four_o part_n of_o good_a turpentine_n i_o find_v that_o the_o remain_a body_n will_v not_o when_o cold_a continue_v a_o liquor_n but_o harden_v into_o a_o transparent_a gum_n almost_o like_o amber_n which_o as_o i_o look_v for_o prove_v electrical_a exper._n ii_o second_o by_o mix_v two_o such_o liquid_a body_n as_o petroleum_n and_o strong_a spirit_n of_o nitre_n in_o a_o certain_a proportion_n and_o then_o distil_v they_o till_o there_o remain_v a_o dry_a mass_n i_o obtain_v a_o brittle_a substance_n as_o black_a as_o jet_v and_o who_o superficies_n where_o it_o be_v contiguous_a to_o the_o retort_n be_v glossie_n like_o that_o mineral_n when_o polish_a and_o as_o i_o expect_v i_o find_v it_o also_o to_o resemble_v jet_n in_o be_v endow_v with_o a_o electrical_a faculty_n exper._n iii_o three_o have_v burn_v antimony_n to_o ash_n and_o of_o those_o ash_n without_o any_o addition_n make_v a_o transparent_a glass_n i_o find_v that_o when_o rub_v as_o electrical_a body_n ought_v to_o be_v to_o excite_v they_o it_o answer_v my_o expectation_n by_o manifest_v a_o not_o inconsiderable_a electricity_n and_o this_o be_v the_o worthy_a of_o notice_n because_o that_o as_o a_o vitrum_fw-la antimonii_n that_o be_v say_v to_o be_v pure_a than_o ordinary_a may_v be_v make_v of_o the_o regulus_n of_o the_o same_o mineral_n in_o who_o preparation_n you_o know_v a_o great_a part_n of_o the_o antimonial_a sulphur_n be_v separate_v and_o leave_v among_o the_o scoriae_fw-la so_o glass_n of_o antimony_n make_v without_o additament_n may_v easy_o as_o experience_n have_v inform_v we_o be_v in_o part_n reduce_v to_o a_o regulus_n a_o body_n not_o reckon_v among_o electrical_a one_o and_o that_o you_o may_v not_o think_v that_o it_o be_v only_o some_o peculiar_a and_o fix_a part_n of_o the_o antimony_n that_o be_v capable_a of_o vitrification_n let_v i_o assure_v you_o that_o even_o with_o the_o other_o part_n that_o be_v wont_a to_o fly_v away_o namely_o the_o flower_n a_o antimonial_a glass_n may_v without_o a_o addition_n of_o other_o ingredient_n be_v make_v exper._n iu._n fourthly_o the_o mention_n of_o a_o vitrified_a body_n bring_v into_o my_o mind_n that_o i_o more_o than_o once_o make_v some_o glass_n of_o lead_n per_fw-la se_fw-la which_o i_o find_v no_o very_a easy_a work_n that_o also_o be_v not_o whole_o destitute_a of_o a_o electrical_a virtue_n though_o it_o have_v but_o a_o very_a languid_a one_o and_o it_o be_v not_o here_o to_o be_v overlook_v that_o this_o glass_n may_v easy_o be_v bring_v to_o afford_v again_o malleable_a lead_n which_o be_v never_o reckon_v that_o i_o know_v of_o among_o electrical_a body_n exper._n v._n fisth_o have_v take_v some_o amber_n and_o wary_o distil_v it_o not_o with_o sand_n or_o powder_a brick_n or_o some_o such_o additament_n as_o chemist_n be_v wont_a to_o use_v for_o fear_v it_o shall_v boylover_n or_o break_v their_o vessel_n but_o by_o its_o self_n that_o i_o may_v have_v a_o unmix_a caput_fw-la mortuum_fw-la having_n make_v this_o distillation_n i_o say_v and_o continue_v it_o till_o it_o have_v afford_v a_o good_a proportion_n of_o phlegm_n spirit_n volatile_a salt_n and_o oil_n the_o retort_n be_v wary_o break_v and_o the_o remain_a matter_n be_v take_v out_o in_o a_o lump_n which_o though_o it_o have_v quite_o lose_v its_o colour_n be_v burn_v quite_o black_a and_o though_o it_o be_v grow_v strange_o brittle_a in_o comparison_n of_o amber_n so_o that_o they_o who_o believe_v the_o virtue_n of_o attract_v