222 Referate. 



the facts. And as a matter of fact Spillman's distinction between his 

 views and those imputed to others reduces to an absurdity. He supposes 

 the difference between race No. i and Race No. 2 to be due to a more 

 potent chromosome function in Race No. i. In other words the total 

 chromosome functions are: 



Race No. i = X + A 



Race No. 2 = X 

 The difference is the presence and absence of the activity of a hypo- 

 thetical something A, or as expressed in Mendelian notation A and a. There 

 is no difference m the two notations. But Spillman assumes a more or 

 less definite physical basis of inheritance, even though he calls it a physio- 

 logical basis, while other writers make no assumptions whatever as to nature 

 of their hypothetical factors. 



E. M. East and O. E. White, Harvard University. 



