SUMMARY OF PHYSIOLOGICAL DEVELOPMENT, 395 



among other parts that are modified, molecularly or other 

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

 isms. The molecules cf their produced germs must tend 

 ever to conform the motions of their components, and there 

 fore the arrangements of their components, to the molecular 

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

 of molecular forces be 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 aggregate of 

 molecular forces. 



