IDENTICAL CHANGES 



and because the whole Universe is full of them 

 (Prop. I, B. 1), therefore, a movement of any one 

 or more of them necessitates the change of some 

 bo'dy into its component void matter, and a simul- 

 taneous change of void matter somewhere else into 

 organized substance. (Prop. XXI, B. 1.) Yet 

 even where these two changing bodies are in close 

 proximity, the movement of primary spheres be- 

 tween them is participated in by all void matter 

 surrounding the moving spheres, in ever lessening 

 distance of movement, as the distance from the 

 bodies increases. 



This may be readily seen by putting a number 

 of round disks (coins, for instance) on the table 

 in closest possible contact, and then moving any 

 inside disk in any direction. 



Again, our brain undergoes a change, when we 

 see a star millions of miles off, and countless other 

 identities suffer a change because of that same 

 starlight. Then there must be a change of position 

 of every P. S. between us and the star. And in 

 every direction a change must take place. 



Therefore, every manifestation of force is at 

 last connected, on both ends, with a movement 

 of P. S. in universal void matter; all force is uni- 

 versal force. 



97 



