IDENTICAL CHANGES 



ment, the limitations of forces become a question of 

 space vacated on one side and occupied on the 

 other side, and how many primary spheres par- 

 ticipated in the movement. 



Because any manifested force is already preceded 

 by innumerable changes, before we perceive it, 

 therefore, we may justly look upon force as already 

 brought into the relations of time and distance, 

 before we perceive any manifestation of force. 

 Then through the law that matter must occupy 

 space, force that is infinite and instantaneous is 

 limited in our perception to laws of intensity and 

 duration of time and distance. 



PROPOSITION XI. 



Two lines drawn from the centre of any primary 

 sphere, anywhere in the Universe, to the centres 

 of two other P. S. in closed contact with the first 

 sphere, together with all lines that may be draivn 

 parallel to both of these lines, constitute a universal 

 plane. 



Let the circles in Figure A represent primary 

 spheres. p 



