THE LIFE VARIES AS THE CORRESPONDENCE. 91 



tiform aggregates which display in the highest degree the 

 phenomena of Evolution structurally considered, must at the 

 same time be aggregates which display in the highest de- 

 gree the multiform actions which constitute Evolution 

 functionally considered. These heterogeneous changes, 



exhibited simultaneously and in succession by a living or- 

 ganism, prove, on further inquiry, to be distinguished by 

 their combination from certain non-vital changes which 

 simulate them. Here, too, the parallelism is maintained. 

 It was shown in 56 of First Principles, that an essential 

 characteristic of Evolution is the integration of parts, which 

 accompanies their differentiation an integration that is 

 shown both in the consolidation of each part, and in the 

 consolidation of all the parts into a whole. Now, manifestly, 

 combination among the changes going on in different com- 

 bined parts, must be proportionate to the degree of com- 

 bination among these parts : the more mutually dependent 

 the parts, the more mutually-dependent must be their 

 actions. Hence, animate bodies having greater co-ordin- 

 ation of parts than inanimate ones, must exhibit greater 

 co-ordination of changes. And this greater co-ordination of 

 their changes must not only distinguish organic from inor- 

 ganic aggregates ; but must, for the same reason, distinguish 

 higher organisms from lower ones, as we found that it 

 did. Yet once more, it was pointed out that the 



changes constituting Life, differ from other changes in the 

 definiteness of their combination ; and that a distinction like in 

 kind, though less in degree, holds between the vital changes 

 of superior creatures and those of inferior creatures. These, 

 also, are contrasts in harmony with the contrasts disclosed by 

 the analysis of Evolution. We saw (First Principles, 54, 

 55) that during Evolution, there is an increase of definiteness 

 as well as an increase of heterogeneity. We saw that the 

 integration accompanying differentiation, has necessarily the 

 effect of increasing the distinctness with which the parts are 

 marked off from each other ; and that so, out of the inco- 



