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be_v equal_a but_o diverse_a according_a to_o the_o nature_n of_o the_o thing_n that_o be_v strike_v for_o no_o force_n that_o once_o be_v in_o nature_n can_v be_v lose_v but_o must_v have_v its_o adequate_a effect_n one_o way_n or_o other_o let_v we_o then_o first_o suppose_v the_o body_n strike_v to_o be_v a_o hard_a body_n of_o no_o exceed_a biggnesse_n in_o which_o case_n if_o the_o stroke_n light_v perpendiculary_a upon_o it_o it_o will_v carry_v such_o a_o body_n before_o it_o but_o if_o the_o body_n be_v too_o great_a and_o have_v its_o part_n so_o conjoin_v as_o that_o they_o be_v weak_a they_o the_o stroke_n in_o this_o case_n the_o stroke_n drive_v one_o part_n before_o it_o and_o so_o break_v it_o from_o the_o rest_n but_o last_o if_o the_o part_n of_o the_o strike_a body_n be_v so_o easy_o cessible_a as_o without_o difficulty_n the_o stroke_n can_v divide_v they_o than_o it_o enter_v into_o such_o a_o body_n until_o it_o have_v spend_v its_o force_n so_o that_o now_o make_v 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extrinsecall_a agent_n it_o seem_v therefore_o impossible_a that_o any_o body_n shall_v have_v any_o motion_n natural_a to_o itself_o and_o if_o there_o be_v none_o natural_a there_o can_v be_v none_o violent_a and_o so_o this_o distinction_n will_v vainsh_fw-mi to_o nothing_o but_o on_o the_o other_o side_n live_a creature_n do_v manifesty_n show_v natural_a motion_n have_v natural_a instrument_n to_o perform_v certain_a motion_n wherefore_o such_o motion_n must_v of_o necessity_n be_v natural_a to_o they_o but_o these_o be_v not_o the_o motion_n which_o we_o be_v to_o speak_v of_o for_o aristotle_n division_n be_v common_a to_o all_o body_n or_o at_o the_o least_o to_o all_o those_o we_o converse_v withal_o and_o particulary_a to_o those_o which_o be_v call_v heavy_a and_o
the_o cause_n of_o the_o plummet_n remount_v as_o long_o as_o gravity_n be_v say_v to_o be_v a_o quality_n for_o still_o gravity_n must_v be_v the_o cause_n of_o a_o effect_n contrary_a to_o its_o own_o inclination_n by_o set_v on_o foot_n the_o immediate_a cause_n to_o produce_v it_o the_o second_o thing_n we_o be_v to_o note_v in_o this_o experiment_n of_o the_o plummet_n ascent_n be_v that_o if_o gravity_n be_v a_o quality_n there_o must_v be_v as_o much_o resistance_n to_o its_o go_v up_o as_o there_o be_v force_n to_o its_o come_n down_o therefore_o there_o must_v be_v twice_o as_o much_o force_n to_o make_v it_o ascend_v as_o there_o be_v to_o make_v it_o descend_v that_o be_v to_o say_v there_o must_v be_v twice_o as_o much_o force_n as_o the_o natural_a force_n of_o the_o gravity_n be_v for_o there_o must_v be_v once_o as_o much_o to_o equalise_v the_o resistance_n of_o the_o gravity_n and_o then_o a_o other_o time_n as_o much_o to_o carry_v it_o as_o far_o through_o the_o 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have_v its_o birth_n from_o the_o universal_a oeconomy_n of_o nature_n here_o among_o we_o that_o be_v from_o the_o general_a work_n of_o the_o sun_n whereby_o all_o natural_a thing_n have_v their_o course_n and_o by_o reason_n that_o the_o cause_n of_o it_o be_v at_o all_o time_n and_o in_o all_o place_n constant_o the_o same_o next_o unto_o which_o the_o order_n of_o discourse_n lead_v we_o to_o take_v a_o survey_n of_o those_o force_a motion_n who_o first_o cause_v the_o more_o apparent_a they_o be_v the_o more_o obscurity_n they_o leave_v we_o in_o to_o determine_v by_o what_o mean_v they_o be_v continue_v when_o a_o tennis_n ball_n be_v strike_v by_o a_o rackett_n or_o a_o arrow_n be_v shoot_v from_o a_o bow_n we_o plain_o see_v the_o cause_n of_o their_o motion_n namely_o the_o string_n which_o first_o yield_v and_o then_o return_v with_o a_o great_a celerity_n do_v cause_n the_o missive_n to_o speed_v so_o fast_o towards_o their_o appoint_a home_n experience_n inform_v we_o what_o quality_n the_o missive_n must_v be_v endue_v withal_o to_o move_v fast_o and_o steady_o they_o must_v be_v so_o heavy_a that_o the_o air_n may_v not_o break_v their_o course_n and_o yet_o so_o light_a that_o they_o may_v be_v within_o the_o command_n of_o the_o stroke_n which_o give_v they_o motion_n the_o striker_n must_v be_v dense_a and_o in_o its_o best_a velocity_n the_o angle_n which_o the_o missive_a be_v to_o mount_v by_o if_o we_o will_v have_v it_o go_v to_o its_o further_a random_n must_v be_v the_o half_a of_o a_o right_a one_o and_o last_o the_o figure_n of_o the_o missive_a must_v be_v such_o as_o may_v give_v scope_n unto_o the_o air_n to_o bear_v it_o up_o and_o yet_o not_o hinder_v its_o course_n by_o take_v too_o much_o hold_v of_o it_o all_o this_o we_o see_v but_o when_o withal_o we_o see_v that_o the_o mover_n desert_v the_o movable_a as_o soon_o as_o he_o have_v give_v the_o blow_n we_o be_v at_o a_o stand_n and_o know_v not_o where_o to_o seek_v for_o 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