BIOLOGY AND SOCIOLOGY 99 



has led to an ever-increasing number of men and 

 women finding most of their adventure and romance 

 in books instead of in the life that we are accustomed 

 to call real. But that would lead us away from 

 our main point — enough to have indicated another 

 great difference between processes above and below 

 the human level. 



There are numerous important questions concern- 

 ing our right to apply biological ideas of heredity 

 directly to human beings which I would have liked 

 to touch upon. But for one thing I have not the time, 

 and for another, Mr. Carr-Saunders in his recent book 

 on the Population Problem has dealt so fully with the 

 relation between biological inheritance and what may 

 be called tradition-inheritance, that I omit them with 

 a good conscience. 



In this brief treatment I have had to ask you to 

 take conclusions on trust, without presenting the 

 evidence on which they are based ; this, however, 

 is inevitable when transferring ideas from one science 

 to another. I have attempted to show, first, that 

 biology can profit by incorporating certain conclusions 

 of sociology and so rounding off and completing 

 certain of its own principles : on the other hand, I 

 have put before you my belief that there are certain 

 basic biological principles which must be taken into 

 account by the sociologist — principles which hold 

 good in sociology because man too is an organism. 



By now, however, we can see more clearly the way 



