370 THE AMERICAN NATURALIST [YOL.LH 



tained from a cross between Arena fatua X Arena sativa 

 var. Kherson. The two parent forms differ in a number 

 of characters some of which may be given here. The 

 Avena fatua is brown or black in color, has both kernels 

 awned and pubescent and has the typical wild type of 

 base surrounded by a tuft of basal hairs. The Kherson 

 is yellow in color, has few or no awns and lacks pubes- 

 cence on the glumes and has the typical sativa base on 

 which is found an occasional hair. 



The Fj type is intermediate between the two parents. 

 The color of grain is brown but somewhat lighter than 

 the wild parent, and the larger kernel in the spikelet is 

 usually awned, 5 while the smaller or upper kernel is 

 never awned. The lower grain exhibits a medium pubes- 

 cence while the upper grain is always smooth. The base 

 is intermediate between the two parent forms with tufts 

 of hair on each side but not all around the base. 



Some of the results of the F 2 generation may be given 

 in Surface's conclusion: 



