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THE AMERICAN NATURALIST [Vol. LIT 



segregation of the grays does not follow the 1:2:1 ratio 

 here but it is possible that some of those classed as non- 

 pubescent may have a few hairs when examined more 

 closely. It was found with the second generation ma- 

 terial that it was necessary to use a lens with certain ones, 

 especially where there was very little pubescence show- 

 ing. This has not been done with all those in this table 

 and, therefore, it is possible on later examination that 

 some of them may fall into the group of one kernel pubes- 

 cent. The yellow oats also, instead of all being in the 

 non-pubescent group, have a few in the class having one 

 kernel pubescent. It is likely that on later examination 

 these will be found to be gray oats. This can not be said 

 at present. In general, it may be said that this segrega- 

 tion agrees very closely with that of the second genera- 

 tion with the exception of the five yellow plants which 

 seem to exhibit some slight amount of pubescence. 



The relations between color and type of base for these 

 same three third generation families is shown in Table 

 VI. 



TABLE VI 



Type of Base 



On examining this table it is clear that the segregation 

 of these third generation families agrees very closely 

 with that of the second generation material. The black 

 and gray oats have both wild and sativa bases in appar- 

 ently a 1 : 3 ratio. The yellow oats, on the other hand, 

 have only the safira base. This material tends to sub- 

 stantiate the conclusions drawn from the second genera- 

 tion material, which is to the effect that it does not seem 



