THE LAW OF EVOLUTION CONTINUED. 371 



whole and by its members. The entire mass is integrating, 

 and simultaneously differentiating from other masses; and 

 each member of it is also integrating and simultaneously dif- 

 ferentiating from other members. 



Our conception, then, must unite these characters. As 

 we now understand it, Evolution is definable as a change 

 from an incoherent homogeneity to a coherent heteroge- 

 neity, accompanying the dissipation of motion and integra- 

 tion of matter. 



