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much_o disperse_v nor_o so_o well_o preserve_v either_o
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help_v mankind_n but_o very_o much_o disserve_v those_o great_a interest_n by_o set_v the_o understanding_n at_o rest_n in_o general_a obscurity_n or_o employ_v it_o in_o airy_a nicety_n and_o dispute_n and_o so_o hinder_v its_o pursuit_n of_o particular_a cause_n and_o experimental_a reality_n in_o this_o treatise_n he_o lay_v the_o foundation_n and_o deliver_v the_o principle_n of_o the_o mechanic_n philosophy_n which_o he_o strengthen_v and_o illustrate_v by_o several_a very_o pleasant_a and_o instructive_a experiment_n he_o show_v that_o the_o most_o admirable_a thing_n which_o have_v be_v take_v for_o the_o effect_n of_o substantial_a form_n and_o be_v use_v as_o proof_n of_o the_o notional_a hypothesis_n may_v be_v the_o result_v of_o the_o mere_a texture_n and_o position_n of_o part_n since_o art_n be_v able_a to_o make_v vitriol_n as_o well_o as_o nature_n and_o body_n by_o humane_a skill_n may_v be_v produce_v who_o suppose_a form_n have_v be_v destroy_v he_o give_v many_o 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i_o say_v this_o excellent_a person_n have_v by_o experiment_n rare_a and_o new_a about_o these_o subject_n make_v it_o evident_o appear_v that_o the_o internal_a motion_n configuration_n and_o posture_n of_o the_o part_n be_v all_o that_o be_v necessary_a for_o alteration_n and_o diversity_n of_o body_n and_o consequent_o that_o substantial_a form_n and_o real_a quality_n be_v needless_a and_o precarious_a being_n these_o be_v some_o brief_a and_o general_a hint_n of_o those_o great_a thing_n this_o incomparable_a person_n have_v do_v for_o the_o information_n and_o benefit_n of_o man_n and_o beside_o they_o there_o be_v several_a other_o that_o he_o have_v by_o he_o and_o the_o inquisitive_a expect_v in_o which_o real_a philosophy_n and_o the_o world_n be_v no_o less_o concern_v i_o receive_v a_o late_a account_n of_o they_o from_o a_o ingenious_a friend_n of_o he_o mr._n oldenburgh_n secretary_n to_o the_o royal_a society_n who_o also_o render_v himself_o a_o great_a benefactor_n 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that_o which_o be_v so_o stop_v into_o a_o vessel_n of_o mercury_n the_o tube_n be_v perpendicular_o erect_v let_v he_o then_o subtract_v his_o finger_n and_o he_o will_v perceive_v the_o quick_a silver_n to_o descend_v from_o the_o tube_n into_o the_o subjacent_a vessel_n till_o it_o come_v to_o 29_o digit_n or_o thereabouts_o there_o after_o some_o vibration_n it_o ordinary_o rest_v the_o reason_n that_o this_o remainder_n of_o the_o mercury_n do_v not_o descend_v also_o be_v because_o such_o a_o mercurial_a cylinder_n be_v just_o equiponderant_a to_o one_o of_o the_o insumbent_a atmosphere_n that_o lean_v upon_o the_o quicksilver_n in_o the_o vessel_n and_o so_o hinder_v a_o further_a descent_n it_o be_v conclude_v therefore_o that_o such_o a_o cylinder_n of_o the_o air_n as_o press_v upon_o the_o mercury_n in_o the_o vessel_n be_v of_o equal_a weight_n to_o about_o 29_o digit_n of_o that_o ponderous_a body_n in_o the_o tube_n thus_o it_o be_v when_o the_o air_n be_v in_o its_o 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