November 14, 1902.] 



SCIENCE. 



795 



Male. 

 Turkey. 



Female. 

 Little Club. 



Plat No. 

 D 2 

 D 8 

 D 9 

 DIO 

 Dll 

 D15 

 D16 



Average, 



Per cent. 

 Bearded Plants. 

 40.6 

 26.1 

 27.1 

 27.7 

 28.7 

 36.6 

 29.1 



The agreement between results and theory is 

 here close enough to confirm the theory in this 

 case. 



There were likewise five crosses in which one 

 of the parents had velvet chafl^. This proved 

 to be a dominant character (except in one 

 individual plant), and the second generation 

 should therefore show Y5 per cent, of plants 

 having velvet chaff. The results follow : 



A single first generation plant (1 15) of 

 this last cross had glabrous chaff. It is in- 

 teresting to note that velvet chaff was not 

 recessive in the ordinary sense, for in this 

 case one fourth of its progeny should have 

 had velvet chaff. But neither this plant nor 

 any of its progeny had this character. This 

 is an instance in which a parent character 

 wholly disappeared in the hybrid, and did not 

 reappear. The significance of this is not 

 clear unless the velvet-chaffed parent was 

 itself a hybrid having latent characters in it. 

 There is some evidence that this was the case. 

 The next cross is the reciprocal of the last. 

 In it there were 27 plats in the second genera- 

 tion, each the progeny of a single first genera- 

 tion plant. Nine of these plats were ex- 

 tremely irregular in character. In five of 

 them bearded plants appeared, though neither 

 parent was bearded. On the whole, the re- 

 sults are such as might be expected if some 

 of the original Farquahar parents had been 

 hybrids not fixed in character. Most of the 

 varieties used in my work had been carefully 

 selected to type for three years, but in a few 

 instances this was not the case, though I have 

 no records now to show details on this point. 

 The per cent, of plants having velvet chaff 

 in each of the remaining eighteen plats of 

 this cross was as follows : 



