5] 
The third generation progenies inoculated with the covered smut 
have shown a very different behavior. During the past year, 179 
third generation progenies were grown, and only 1 of these was 
classified as resistant, 64 as segregating, and 114 as susceptible, 
thus confirming the data of the previous year. The noteworthy 
feature about the behavior of these hybrids to the covered smut 
is the almost complete absence of resistant progenies, combined 
with the great excess of those which may be classified as suscepti- 
ble. 
The results obtained with the third generation progenies, how- 
ever, are in harmony with those secured for the second generation 
plants. A large number of these were inoculated and, altogether, 
71.4 per cent. were infected. Probably the fact that one parent is 
fully susceptible to the covered smut while the other is moderately 
susceptible enters into the explanation for the facts obtained. 
Hybrid 83 is a cross between Canadian and Black Norway. 
Canadian is very susceptible to both smuts, while Black Norway is 
somewhat susceptible to the loose smut but very resistant to the 
covered. There were 24 third generation progenies inoculated 
with the loose smut and most of these proved very susceptible; 
however, 5 gave percentages of infection below 50. ne data 
are comparable with those obtained for the two parental varieties 
and for the few second generation plants which were inoculated. 
There were 60 third generation progenies inoculated with the 
covered smut and 19 were classified as resistant, 31 segregating, 
and 10 susceptible. These results also harmonize with the data 
secured for the second generation, in which 64 plants were inocu- 
lated and 8 (12.5 per cent.), were infected. 
Hybrid 84 is a cross between Scottish Chief and Black Mesdag, 
the former being moderately susceptible to loose smut and quite 
resistant to the covered, while Black Mesdag is resistant to both. 
There were nine different crosses represented. In the second 
generation there were 388 plants inoculated with the loose smut 
and 70 (18 per cent.) were infected. During the past year 269 
third generation progenies were inoculated and 95 were resistant, 
139 segregating, and 35 susceptible. On the basis of the previous 
results for the second generation, we might have expected a larger 
number of susceptible progenies. 
