49* 



THE AMERICAN NATURALIST 



[Vol. LII 



tian X Kekchi hybrids described by Cook (1909, p. 12-14) 

 and the Egyptian X Hindi hybrids described by Marshall 

 (1915).) 



Little or no evidence of dominance was shown by the 

 distributions, for the various characters, of the F 1 of the 



simple hybrids. The F 2 distributions were strictly uni- 

 modal for all characters excepting the highly variable 

 one length of axis, and even in this case the indication of 

 bimodality was so slight as to be probably insignificant. 



