EVOLUTION AND VARIATION 59 



only can the functions of a colony be maintained, 

 and upon its integrity depends its continued 

 existence; it must depend upon specialized 

 individuals. 



As in multicellular life, so in the structure of our 

 human social fabric individual human life must 

 be specialized to a certain extent so that we may 

 adapt ourselves to existence with one another. 

 Individuals cannot exist except through the mu- 

 tual aid of one another. The same laws govern 

 cell life, human life, all life. These fundamental 

 laws cannot be evaded. They apply to personal, 

 social, and national life, and any virtue or defect 

 in an individual infallibly affects the whole. 



It has been said that a "House divided against 

 itself must fall." A plant, an animal, a man, 

 a society, a nation, a continent or a world 

 whose individual units do not cooperate har- 

 moniously is on the highroad to destruction. 

 All that is precious to the whole human race 

 is devastated by war which threatens to de- 

 stroy from the earth much that had been built up 

 faithfully and painfully during centuries for the 

 best interests of the race. 



The Fundamental Significance of Sex 



We find these words in a late scientific work 

 by Dr. L. Doncaster, Fellow of King's College, 



