NOTE 



SOME time before his death Mr. Romanes decided 

 to publish those sections of his work which deal with 

 Heredity and Utility, as a separate volume, leaving 

 Isolation and Physiological Selection for the third and 

 concluding part of Darwin, and after Darwin. 



Most of the matter contained in this part was 

 already in type, but was not finally corrected for the 

 press. The alterations made therein are for the most 

 part verbal. 



Chapter IV was type-written ; in it, too, no altera- 

 tions of any moment have been made. 



For Chapters V and VI there were notes and iso- 

 lated paragraphs not yet arranged. I had promised 

 during his life to write for Mr. Romanes Chapter V 

 on the basis of these notes, extending it in such ways 

 as seemed to be desirable. In that case it would 

 have been revised and amended by the author and 

 received his final sanction. Death annulled this 

 friendly compact ; and since, had I written the 

 chapter myself, it could not receive that imprimatur 

 which would have given its chief value, I have decided 



