388 PHYSIOLOGICAL DEVELOPMENT. 



among the movements, molecular and other, of all parts ; then 

 among other parts that are modified, molecularly or other- 

 wise, must be those which cast off the germs of new 

 organisms. The molecules of their produced germs must 

 tend ever to conform the motions of their components, and 

 therefore the arrangements of their components, to the 

 molecular forces of the organism as a whole ; and if this 

 aggregate of molecular forces is modified in its distribution 

 by a local change of structure, the molecules of the germs 

 must be gradually changed in the motions and arrangements 

 of their components, until they are re-adjusted to the aggre- 

 gate of molecular forces. For to hold that the moving equi- 

 librium of an organism may be altered without altering the 

 movements going on in a particular part of it, is to hold that 

 these movements will not be affected by the altered distribu- 

 tion of forces ; and to hold this is to deny the persistence of 

 force. 



