MECHANISM OF NATURE 



And let the line B C join the centres of the 

 circles B and C. 



And let the line B D join the centres of the 

 circles B and D. 



Let the line E F touch the outer edges of the 

 circles B and C. 



Then it is evident that the line E F which is 

 parallel to the line B C cannot be parallel to the 

 line B D that diverges from the line B C, except 

 only in one direction, namely, the plane of this 

 paper. And it is evident also that no other line 

 can be drawn parallel to both the lines B C and 

 B D except in a plane wherein any number of 

 lines may be drawn parallel to both, although in 

 every other direction they must diverge. 



PROPOSITION XII. 



Every manifestation of force whose intensity is 

 decreased after the inverse square, or after the 

 plain increase of the square, by the increase of 

 distance between the bodies displaying the mani- 

 festation, is a displacement of P. 8. of void matter 

 in plane layers. 



Light, heat, magnetism and gravity are transmis- 

 sions of force from one body to another body, and 

 always there are two bodies affected by them at 

 the same time. And these manifestations often 

 occur when there is no organized material between 

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