Hybridization 129 



experience, it is very difficult to get good seeds from 

 squashes fertilized by a flower upon the same vine. 

 The squashes may grow normally to full maturity but be 

 entirely hollow, or contain only empty seeds. In some 

 instances the seeds may appear to be good, but may 

 refuse to grow under the best conditions. Finally, a 



FIG. 35. Variation in hybrid squashes. 



small number of flowers may give good seeds. I have 

 many times observed this refusal of squashes (Cucurbita 

 Pepo) to in-breed. It was first brought to my attention 

 through efforts to fix certain types into varieties. The 

 figures of the season's tests will sufficiently indicate the 

 character of the problem. In 1890, one hundred and 



