DYNAMICS. 19 



DYNAMICS. 



SECT. I. 



OF THE MEASURES OF MOTION, 



43. \V HEN a body changes its place continually, 

 it is said to MOVE, or to be in MOTION. 



44. A moving body cannot pass from one point 

 of space to another without passing through every 

 intermediate point ; that is, whatever be the path 

 it describes, it must intersect all the planes that 

 can pass any how in the interval between the two 

 points. 



45. The ideas of Space and Time are both neces- 

 sarily involved in the idea of motion. 



46. Time is conceived as a quantity consisting 



B2 of 



