56 
in Hybrid 79 was much higher than night be expected. However, 
a large number of plants, namely 287, were inoculated, and it 1s 
interesting to note that the three different crosses of this hybrid 
gave very similar results. 
The results with Elyvbrid 80, inoculated with the covered smut, 
also indicate a segregation on the basis of a ratio of three resistant 
to one susceptible plant. Pybrid 82, represented by five different 
crosses, has given a very different result with the covered smut. 
The segregation in the second generation has indicated three sus- 
ceptible plants to one resistant, just the opposite from the results 
previously described. There were a large number of plants of 
the five crosses inoculated, and the range of infection in the dif- 
ferent crosses was quite simular. It may be noted that the one 
parent, Monarch, 1s completely susceptible to the covered smut, 
and that the other parent, Danish Island, sometimes contains in- 
fected plants. 
Hu 
In Hybrid 79, both parents were very susceptible to the coverec 
smut, and practically all of the second generation plants were in- 
fected. Thus, these plants were as susceptible to this smut as 
the parental varieties. Stuular results were observed in) Hybrid 
80 with reference to the loose smut. In this case also, both pa- 
rental varieties were extremely susceptible to the loose smut. In 
Hybrid 81, the two parents were resistant to the covered smut, and 
complete resistance was observed among the second generation 
plants. 
Experiments with the Third Generation of Oat Hybrids. Vhe 
third generation progenies of two different oat hybrids were 
grown. Of Hybrid 61, Orientalis & Victor, there were 47 third 
generation progenies inoculated, one set of seed with the loose 
smut, and another with the covered. Both parental varieties are 
very susceptible to the loose smut, and the progenies grown gave 
percentages of infection varying from 68.1 to 100, in 13 of them 
all the plants being smutted. The variety Victor is very suscep- 
tible to covered smut, while Orientalis is resistant. Of the 47 
progenies, 8 were entirely resistant, 24 gave infections of 8.3 to 
47.8 per cent., and the remaining 15, more than 51 per cent. infec- 
tion; in 4 of the progenies all the plants were smutted. 
There were grown 33 third generation progenies of Hybrid 
