1890 THE COLOUES OP ANIMALS 261 



lishers also consent. In particular figs. 1, 2, 6, 10, 

 40, and 41. 



Having now read the book,^ I may say how 

 greatly it has delighted me. The whole is a wonder- 

 ful story, and I congratulate you on the large share 

 which you have had in adding to this chapter of 

 Darwinism. 



There is only one point I am not quite clear about, 

 viz. pp. 213-215. It is doubtless an advantage to 

 the parasites that the caterpillars should warn them 

 off as having been already ' occupied.' But would 

 not this be rather a disadvantage to the caterpillars 

 — i.e. to their species ? For in this way, it seems to 

 me, a greater number of caterpillars would become 

 infested than would be the case in the absence of 

 such warning. Or is there any point about it which 

 I do not understand ? 



When is your next book coming out ? I should 

 like you to read my reply to Wallace before it does. 

 Also my re-statement of physiological selection, with 

 discussion on the principles of Segregation and 

 Divergence. I hope the whole will be in type before 

 November. Can you wait tiU then, or shall I send 

 type-written MSS.? 



Yours very sincerely, 



GrEOEGE J. EoMANES. 



P.S. — Talking about hon. degrees the last time I 

 saw you reminded me — but something again put it 

 out of my head — that I had been wondering why 



' The Colours of Animals, by E. B. Poulton, M.A., F.E.S., Inter- 

 national Scientific Series, vol. Ixviii. 



