MECHANISM OF NATURE 



more material, to the infinite circle of material, 

 moved to infinite change, by infinite life. 



PROPOSITION III. 



Every display of force requires pushing on one 

 side and yielding on the other side. 



Force cannot be transmitted from one body to 

 another body, when the two are in all re- 

 spects equal. (Prop. XVIII, B. 1.) The irre- 

 sistible force, pressing against the immovable post, 

 will not produce action on manifestation until the 

 post ceases to be irresistible. When the steam is 

 turned on equally on both sides of the piston, the 

 piston will not move, be the pressure ever so great. 



Therefore, every action of force depends, in du- 

 ration and intensity, on one body pushing and an- 

 other yielding. 



PROPOSITION IV. 



Force is irresistible and instantaneous. 



We speak of strength and weakness and measure 

 our motive power in quantity and intensity. And 

 often we forget that strong and weak alike are in- 

 separable links of one whole chain; and, because 

 we cannot readily trace the connection of one iden- 

 tity with the whole Universe, that identity is in- 



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