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equal_a b._n the_o cause_n can_v be_v no_o other_o the_o small_a spark_n of_o fire_n fly_v up_o seem_v a_o line_n draw_v upward_o and_o again_o by_o that_o swift_a circular_a motion_n which_o we_o have_v suppose_v for_o the_o cause_n of_o light_n seem_v also_o broad_a than_o it_o be_v and_o consequent_o the_o flame_n of_o every_o thing_n must_v needs_o seem_v much_o great_a than_o it_o be_v a._n what_o be_v those_o spark_n that_o fly_v out_o of_o the_o fire_n b._n they_o be_v small_a piece_n of_o the_o wood_n or_o coal_n or_o other_o fuel_n loosen_v and_o carry_v away_o with_o the_o air_n that_o come_v up_o with_o they_o and_o be_v extiguish_v before_o their_o part_n be_v quite_o dissipate_v into_o other_o be_v so_o much_o soot_n and_o black_a and_o may_v be_v fire_v again_o a._n a_o spark_n of_o fire_n may_v be_v strike_v out_o of_o a_o cold_a stone_n it_o be_v not_o therefore_o heat_v that_o make_v this_o shine_a b._n no_o it_o be_v the_o motion_n that_o make_v both_o the_o heat_n 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which_o place_n therefore_o there_o must_v be_v a_o very_a vehement_a motion_n and_o consequent_o if_o there_o be_v in_o that_o place_n combustible_a matter_n such_o as_o be_v not_o very_o hard_o kindle_v the_o part_n of_o it_o will_v be_v dissipate_v and_o receive_v that_o motion_n which_o work_v on_o the_o eye_n as_o other_o fire_n do_v the_o same_o reason_n be_v to_o be_v give_v for_o burn_v by_o reflection_n for_o there_o also_o the_o beam_n be_v collect_v into_o almost_o a_o point_n a._n why_o may_v not_o the_o sunbeam_n be_v such_o a_o body_n as_o we_o call_v fire_n and_o pass_v through_o the_o pore_n of_o the_o glass_n so_o dispose_v as_o to_o carry_v they_o to_o a_o point_n or_o very_o near_o b._n can_v there_o be_v a_o glass_n that_o be_v all_o pore_n if_o there_o can_v then_o can_v this_o effect_n be_v produce_v by_o the_o pass_n of_o fire_n through_o the_o pore_n you_o have_v see_v man_n llght_n their_o tobacco_n at_o the_o sun_n with_o a_o burn_a glass_n or_o with_o a_o ball_n of_o crystal_n hold_v which_o way_n they_o will_v indifferent_o which_o must_v be_v impossible_a unless_o the_o ball_n be_v all_o pore_n again_o neither_o you_o nor_o i_o can_v conceive_v any_o other_o fire_n than_o we_o have_v see_v nor_o then_o such_o as_o water_n will_v put_v out_o but_o not_o only_o a_o solid_a globe_n of_o glass_n or_o crystal_n will_v serve_v for_o a_o burn_a glass_n but_o also_o a_o hollow_a one_o fill_v with_o water_n how_o then_o do_v the_o fire_n from_o the_o sun_n pass_v through_o the_o glass_n of_o water_n without_o be_v put_v out_o before_o it_o come_v to_o the_o matter_n they_o will_v have_v it_o burn_v a._n i_o know_v not_o there_o come_v nothing_o from_o the_o sun_n if_o there_o do_v there_o be_v come_v so_o much_o from_o it_o already_o that_o at_o this_o day_n we_o have_v have_v no_o sun_n chap._n v._o problem_n of_o hard_a and_o soft_a a._n what_o call_v you_o hard_o and_o what_o soft_a b._n that_o body_n whereof_o no_o one_o part_n be_v easy_o put_v out_o of_o its_o place_n without_o remove_v the_o whole_a be_v that_o which_o i_o and_o all_o man_n call_v hard_a and_o the_o contrary_a soft_a so_o that_o they_o be_v but_o degree_n one_o of_o another_o a._n what_o be_v the_o cause_n that_o make_v one_o body_n hard_o than_o another_o or_o see_v you_o say_v they_o be_v but_o degree_n of_o one_o another_o what_o make_v one_o body_n soft_a than_o another_o and_o the_o same_o body_n sometime_o hard_o sometime_o soft_a b._n the_o same_o motion_n which_o we_o have_v suppose_v from_o the_o begin_n for_o the_o cause_n of_o so_o many_o other_o effect_n which_o motion_n not_o be_v upon_o the_o centre_n of_o the_o part_n move_v but_o the_o part_n itself_o go_v in_o another_o circle_n to_o and_o again_o it_o be_v not_o necessary_a that_o the_o motion_n be_v perfect_o circular_a for_o it_o be_v not_o circulation_n but_o the_o reciprocation_n i_o mean_v the_o to_o and_o again_o that_o do_v cast_v off_o and_o lacerrate_v the_o air_n and_o consequent_o produce_v the_o forementioned_a effect_n for_o the_o cause_n therefore_o of_o hardness_n i_o suppose_v the_o reciprocation_n of_o motion_n in_o those_o thing_n which_o be_v hard_a to_o be_v very_o swift_a and_o in_o very_o small_a circle_n a._n this_o be_v somewhat_o hard_a to_o believe_v i_o will_v you_o can_v supply_v it_o with_o some_o visible_a experience_n b._n when_o you_o see_v for_o example_n a_o cross-bow_n bend_v do_v you_o think_v the_o part_n of_o it_o stir_v a._n no._n i_o be_o sure_a they_o do_v not_o b._n how_o be_v you_o sure_a you_o have_v no_o argument_n for_o it_o but_o that_o you_o do_v not_o see_v the_o motion_n when_o i_o see_v you_o sit_v still_o must_v i_o believe_v there_o be_v no_o motion_n in_o your_o part_n within_o when_o there_o be_v so_o many_o argument_n to_o convince_v i_o there_o be_v a._n what_o argument_n have_v you_o to_o convince_v i_o that_o there_o be_v motion_n in_o a_o cross-bow_n when_o it_o stand_v bend_v b._n if_o you_o cut_v the_o string_n or_o any_o way_n set_v the_o bow_n at_o liberty_n it_o will_v have_v then_o a_o very_a visible_a motion_n what_o can_v be_v the_o cause_n of_o that_o a._n why_o the_o set_n of_o the_o bow_n at_o liberty_n b._n if_o the_o bow_n have_v be_v crooked_a before_o it_o be_v bend_v and_o a_o string_n tie_v to_o both_o end_n and_o then_o cut_v asunder_o the_o bow_n will_v not_o have_v stir_v where_o lie_v the_o difference_n a._n the_o bow_n bend_v have_v a_o spring_n unbend_v it_o have_v none_o how_o crooked_a soever_o b._n what_o mean_v you_o by_o spring_n a._n a_o endeavour_n of_o restitution_n to_o its_o former_a posture_n b._n i_o understand_v spring_n as_o well_o as_o i_o do_v endeavour_n a._n i_o mean_v a_o prnciple_n or_o beginning_n of_o motion_n in_o a_o contrary_a way_n to_o that_o of_o the_o force_n which_o bend_v it_o b._n but_o the_o begin_n of_o motion_n be_v also_o motion_n how_o insensible_a soever_o it_o be_v and_o you_o know_v that_o nothing_o can_v give_v a_o 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course_n of_o this_o internal_a motion_n will_v lie_v along_o the_o bow_n not_o according_a to_o the_o former_a but_o to_o the_o new_a acquire_v posture_n and_o then_o it_o will_v be_v as_o uneasy_a to_o return_v it_o to_o its_o former_a posture_n as_o it_o be_v before_o to_o bend_v it_o a._n that_o be_v true_a for_o bow_n long_o bend_v lose_v their_o appetite_n to_o restitution_n long_a custom_n become_v nature_n but_o from_o this_o internal_a reciprocation_n of_o the_o part_n how_o do_v you_o infer_v the_o hardness_n of_o the_o whole_a body_n b._n if_o you_o apply_v force_n to_o any_o single_a part_n of_o such_o a_o body_n you_o must_v needs_o disorder_v the_o motion_n of_o the_o next_o part_n to_o it_o before_o it_o yield_v and_o there_o disorder_v the_o motion_n of_o the_o next_o again_o must_v also_o be_v disorder_v and_o consequent_o no_o one_o part_n can_v yield_v without_o force_n sufficient_a to_o disorder_v all_o but_o then_o the_o whole_a body_n must_v also_o yield_v now_o 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