THE AMERICAN NATURALIST 

 TABLE III 



From this table it is clear that the black oats segre- 

 gates into the wild and saliva forms as also do the grays. 

 On the other hand, the yellow oats exhibit no wild type 

 of base but are all of the sativa class. It is also appar- 

 ent from these data, then, that in addition to the inhibi- 

 tion of awn production and pubescence there is also some 

 factor or factors which inhibit the production of the wild 

 type of base when this particular cross is made. That 

 it must be due to some factor or factors related to the 

 yellow oats is clear from the fact that with a large num- 

 ber of crosses in which white oats and other forms have 

 been used, the grays and whites as well as the blacks ex- 

 hibit the wild type of base in about the ratio that would 

 be expected. 



TABLE IV 



Seed from a large number of F 2 plants were tested in 

 the F 3 generation but all of these will not be discussed 

 here. Three of these which exhibited the segregation 



