GENETICS 



with certain chemical reservations, are the morpho- 

 logical carriers of the heritage, forms an excellent 

 working hypothesis, and this chapter may suitably be 

 closed with a quotation from Professor Wilson, whose 

 brilliant work in the entire field of cytology makes it 

 possible for him to speak with authority. "In my 

 view studies in this field are at the present time most 

 likely to be advanced by adopting the comparatively 

 simple hypothesis that the nuclear substances are actual 

 factors of reaction by virtue of their specific chemical 

 properties ; and I think that it has already helped us 

 to gain a clearer view of some of the most puzzling 

 problems of genetics.'* 



