1 862.] mimicry. 393 



sexual and individual variability : these will some day, if I 

 live, be a treasure to me. 



With respect to mimetic resemblance being so common 

 with insects, do you not think it may be connected with their 

 small size ; they cannot defend themselves ; they cannot 

 escape by flight, at least, from birds, therefore they escape 

 by trickery and deception ? 



I have one serious criticism to make, and that is about the 

 title of the paper ; I cannot but think that you ought to have 

 called prominent attention in it to the mimetic resemblances. 

 Your paper is too good to be largely appreciated by the mob 

 of naturalists without souls ; but, rely on it, that it will have 

 lasting value, and I cordially congratulate you on your first 

 great work. You will find, I should think, that Wallace will 

 fully appreciate it. How gets on your book ? Keep your 

 spirits up. A book is no light labour, I have been better 

 lately, and working hard, but my health is very indifferent. 

 How is your health ? Believe me, dear Bates, 



Yours very sincerely, 



C. Darwin. 



END OF VOL. II. 



2 D 



