284 



The Ohio Joiifnal of Science [Vol. XVII, No. 8, 



definitive nucleus. The definitive nucleus is formed by the 

 fusion of two nuclei from opposite poles of the female game- 

 tophyte. The fusion nuclei appear following three successive 

 divisions of the megaspore nucleus, during which the egg is 

 differentiated. 



Ectogony is suggested as a necessary word to describe 

 those influences which are due to the developing zygote. In 

 xenia the variation appears as the direct result of the introduc- 

 tion of hereditary factors. 



1907. (15 



1899. (5 



1910. (11 



1916. (12 



1899. (4 



1881. (2 



1899. (7 



1901. (8 



1913. (13 



1872. (3 



1916. (14 



1899. (6 



1916. (10 



1911. (1 



1916. (9 



1917. (16 



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