MECHANISM OF NATURE 



PROPOSITION XV. 



The primary spheres of void matter penetrate all 

 substances. 



Let any substance be heated. Then that sub- 

 stance will require more room in a vessel. (Com- 

 mon experience.) But it cannot occupy more room 

 in the Universe, while it preserves its identity. 

 (Prop. I.) 



Then, something else which required room in the 

 Universe must have changed its place in the Uni- 

 verse, from without the substance heated to within 

 the substance. 



But no weight has been added to the substance 

 by the addition to its bulk. (Axiom IV.) There- 

 fore, it was no organized substance which changed 

 its place from without the substance heated, to 

 within the substance ; therefore, it must have been 

 void matter. 



And since any substance expands by heat, and 

 this will apply to bodies of all sizes, therefore, the 

 primary, etc. 



PROPOSITION XVI. 



Force cannot be transmitted from one body to 

 another body by an unbroken wave. 



The wave of the ocean may roll a thousand miles, 

 but when it strikes the shore or another wave, then 



24 





