The laws and mechanics of circulation, with the principle involved in animal movement . stancesthe moment pressure is relieved, proving thereby inter-molecu-lar action from the presence of a force radiating from moleculeto molecule, otherwise is inexplicable. Now, then, this factbeing indisputable, the question which naturally presentsconcerns the nature of this force. What is it ? This must beestablished before progress can be made in the mechanics ofcirculation, forming, as it were, the basis of the mechanics,and by means of which the nutritive and force-producingelements are set in motion f
The laws and mechanics of circulation, with the principle involved in animal movement . stancesthe moment pressure is relieved, proving thereby inter-molecu-lar action from the presence of a force radiating from moleculeto molecule, otherwise is inexplicable. Now, then, this factbeing indisputable, the question which naturally presentsconcerns the nature of this force. What is it ? This must beestablished before progress can be made in the mechanics ofcirculation, forming, as it were, the basis of the mechanics,and by means of which the nutritive and force-producingelements are set in motion for elaborating structure and ATMOSPHEEIC MAI TEE. evolving force, the whole connecting through and through, thematter necessarily involving continuity in force in order toeffect these results. • • • _ o Jo ° o 0 o o ^ °a9 ° 0 o o° oj ° 1 ° ° o o o 0 O o O O q >o ° o ° o ° O o , © ° °< o o o o o o oo o _o o 0o ° ° o o o \j _ O O q o o ,0o°00oVo0oo00°o0°oOo°oO°Ooo:jo-0°o°°oro0o0=V0Oo°co^o„o0°,oo0o0 0--0-«--V.°-,0o 000 ° °oo0°0o0o0!;o ° °oo. Fig. 1.—An Ideal Section of the Atmosphere, showing the Suspension of this Matter inSpace against the Force of Gravitation, a, a, Molecules of Nitrogen, Oxygen, Car-bonic Acid, etc.; b, b. Aqueous Molecules. In this we are materially assisted by the celebrated experi-ment of Dufay for proving the existence of two electricities, 6 POLAll FOKCES. or positive and negative, which is plain enough. For ex-ample, he discovered, by means of a glass rod excited byrapid friction, that a gold or silver leaf, when liberatednear it, is both attracted and repelled by it. At first,is powerfully attracted, dashing impetuously toward it, and,suddenly stopping, dashes in the opposite direction, when itagain stops suddenly, remaining stationary from two to threeinches from the rod, suspended in the air (Fig. 2). And if oneso mind, he may chase it round and round the room for hourswithout permitting it to fall to th
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