Affairs. 327 



Jltlv 12, 1874. 



MY nr.AK VOI'MANS: I had quite intended during the 

 \\-eek to write and send yon the paragraph I named to fill 

 the cut-out space, but I have been so busy preparing to 

 leave for Scotland on Tuesday that I have been unable. I 

 must leave it to you to do it or not, as you see fit. 



What I thought desirable was to reindicate, in the brief- 

 est way, the growth of the idea* onward from 1842, its 

 growing comprehensiveness and defmiteness, the recogni- 

 tion of the process of selection in the case of human be- 

 ings, the adoption of the idea of increasing heterogeneity 

 and its gradual extension in various directions, the reap- 

 pearance of these ideas in the Psychology in a combined 

 form, with the idea of integration as joining differentiation 

 and the entire interpretation of mind on evolution princi- 

 ples; then to indicate that in 1857 the law of evolution, 

 considered inductively as increasing heterogeneity, was 

 enunciated as universal as well as the deductive interpreta- 

 tion of it as due to the instability of the homogeneous and 

 the multiplication of effects; and that the doctrine as it 

 now stands was thus, in its universality and its chief out- 

 lines, set forth two years before the Origin of Species ap- 

 peared. You have clearly enough stated at the end this 

 independent origin of the doctrine ; but what strikes me is 

 that this fact would be much more clearly seized if in the 

 narration you briefly indicated the stage it had reached be- 

 fore Darwin published. But I leave this hint for you to 

 act on or not, as you think well. 



November 6 t 1874. 



MY DEAR YOUMANS : On my return to town last niijdit, 

 after a week's absence, I found among various other things 

 your last number of the Monthly. I had no idea you were 



* I. e., the growth of the idea of evolution in his own mind. 



