440 
CECIL YAMPOLSKY 
An examination of the literature brings out the fact that the sex of either 
one of the generations in cryptogamic and phanerogamic plants is not 
fixed. 
8. Results in inheritance of polygamous species tend to bear out the 
conception that in such forms there are gametes of graded potencies, this 
being true of the egg as well as of the male gamete. This, together with the 
behavior of selfed females and males as in Mercurialis annua, may explain 
fluctuations in the expected one-to-one ratio. 
The work reported in the foregoing pages was begun in 19 14 under the 
direction of Professor R. A. Harper. The writer wishes to express his 
indebtedness to Professor Harper for his suggestions and criticisms 
during the pursuance of this study. 
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