THEORY OF SEX— ITS NATURE AND ORIGIN. 125 



genesis, or special facts like menstruation and lactation. The whole 

 thesis may be once more summed up diagrammatically. 



In this way we see, with reference to the three speculations out- 

 lined at the beginning of the chapter, — (1) that the penetrating insight 

 of Rolph, of females as the more and males as the less nutritive, is 

 fully justified; (2) that the view of Minot of the differentiation of both 

 sex-cells from a primitive hermaphroditism becomes similarly devel- 

 oped, and acquires greater definiteness; while (3) the view of Brooks, 

 which ascribes variability primarily to the males, at least acquires con- 

 siderable support from the interpretation of the males as preponder- 

 atingly katabolic. For it is rather in connection with the destructive 

 changes of protoplasm than with the constructive, that variations 

 might be expected to arise. 



