EVOLUTION THEORIES 219 



thereby, despite services to evolutionary 

 biology 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 be- 

 yond their immediate 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 fr^sh chapters of 



are many workers w]io 



nr 



of development of plants anr] apmifrls and. 



ijiaji, the intricacies of structures and func- 

 tions, variations and diseases, amid which 

 have lain our various individual trainings 

 as organic evolutionists, with those of other 

 evolutionists, not only the^cosmic t 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 bio- 

 logical theories themselves, but increasingly 

 suggests the fruitful parallel of organic and 

 social evolutioji; and now, as it draws to- 

 wards conclusion, it argues with more and 

 more insistence for the conscious renewal 

 of this, as a working partnership hence- 

 forward. 



