340 



Belling. 

 Siimman of Cnuditions of I*ods. 



This table speaks for itself. 



Working Hypothesis. 



If K is a geuetic factor present in the Velvet "beau", but not in 

 the other three parent plants, where it is replaced by the similar factor 

 L; and the presence of either K oi' L, but not both, is essential for the 

 development of microspores into perfect pollen-grains, and of functional 

 megaspores into perfect embryo-sacs; tliou tlie Fi hybrid zygotes will 

 have KkLl (read, K uo-K, L uo-Li. Tlicir microspores and their 

 megaspores will be of fnui- equal classes witii I'egard to these factors, 

 namely, KL, Kl, kL, and kl. The microspores and megaspores with 

 Kl or with kL ai'e I'espectively similar in this regard to those of the 

 origin.'il parent plants of the cross; and will, ceteris paribus,, develop 

 into normal pollen-grains and embryo-sacs. The microspores or functional 



