The International Scientific Series. 267 



illustrated cards of another bit of slang poetry, but true 

 to nature in Pike County, Illinois. I quite relished the 

 last illustration.* 



37 Queen's Gardens, Baysv/ater, London, W.,Junej, i8yi. 



My dear Youmans : I inclose a brief article just out. 

 I wrote it partly as a quiet way of setting opinion right 

 on the matter. Since the publication of Darwin's De- 

 scent of Man there has been a great sensation about the 

 theory of the development of mind — essays in the mag- 

 azines on Darwinism and Religion, Darwinism and Morals, 

 Philosophy and Darwinism, all having reference to the 

 question of mental evolution, and ail proceeding on the 

 supposition that it is Darwin's hypothesis. As no one says 

 a word in rectification, and as Darwin himself has not in- 

 dicated the fact that the Principles of Psychology was pub- 

 lished five years before the Origin of Species,f I am obliged 

 to gently indicate it myself. 



I send you the letter, thinking that perhaps the repub- 

 lication of the last paragraph with some preliminary ex- 

 planation might not be amiss in America, where I doubt 

 not the same erroneous idea is current. 



Ever yours truly, Herbert Spencer. 



On the date of this last letter (June 3) Mr. You- 

 mans was in mid-ocean, sailing on one of the most im- 

 portant of his many errands to England. Since his 

 resignation of the editorship of Appletons' Journal 

 his services to the Appletons had consisted chiefly in 

 the examination of foreign scientific books, from which 



* The reference is to John Hay's Little Breeches, and to the last stanza, 

 where the angels' deed of kindness is felicitously pronounced 



" A demed sight better business 

 Than loafin' 'round the throne." 



\ Mr. Darwin mentioned the fact next year in the sixth edition of the 

 Origin of Species, pp. xix, 42S. 



