EVOLUTION THEORIES 219 



second only to Darwin's own, he failed to widen 

 the interests of fellow-workers henceforth 

 specialized, and perhaps rather intensified 

 their reluctance to venture beyond their im- 

 mediate problems. They too were doubtless so 

 far right in this : their re-examination of Nature 

 in the light of the Darwinian theory has been 

 a great task. But now on many sides fresh 

 chapters of evolutionary study are opening, 

 and there are many workers who feel free, 

 even constrained, to relate and unify the 

 phenomena of development of plants and 

 animals and man, the intricacies of structures 

 and functions, variations and diseases, amid 

 which have lain our various individual train- 

 ings as organic evolutionists, with those of 

 other evolutionists, not only the cosmic, but 

 the social. Hence, then, the planning of this 

 little book which starting with the social 

 origins of biological evolution theories, next 

 naturally gives its main bulk to the biological 

 theories themselves, but increasingly suggests 

 the fruitful parallel of organic and social 

 evolution; and now, as it draws towards 

 conclusion, it argues with more and more 

 insistence for the conscious renewal of this, 

 as a working partnership henceforward. 



SCIENCE IN ITS RELATIONS TO LABOUR. 

 Note here another difference between the 



