oe 
interesting. In the second generation, 71.4 per cent. of the plants 
were infected, a total of 287 being inoculated. The behavior of 
this hybrid is very different from that of the other hybrids just 
mentioned. The results obtained may, however, be associated 
with the fact that Danish Island occasionally gives some infected 
plants with the covered smut, Monarch being fully susceptible. 
There were 193 third generation progenies of this hybrid 
inoculated with the covered smut, of which 133 descended from 
uninoculated second generation plants. Only 1 of these progenies 
was classified as resistant; there were 52 segregating and 80 
susceptible. Most of the susceptible progenies gave 100 per cent. 
infection. 
Experiments with the Fourth and Fifth Generations of Oat 
Hybrids —Additional data on the fourth and fifth generations of 
Hybrids 29 to 32, Fulghum * Black Mesdag, were obtained, the 
plants being inoculated with the Fulghum Race of loose smut. 
Fulghum is quite susceptible to this race, while Black Mesdag is 
resistant. The families selected had shown a high degree of 
resistance in the earlier generations, and it was demonstrated 
that this resistance persisted through the fourth and fifth genera- 
tions. The lines selected for growing showed various combina- 
tions of the morphological characters of Fulghum and Black 
Mesdag. 
' The experiments with these hybrids have extended over a 
period of several years, and extensive data on the second, third, 
fourth, and fifth generations have been accumulated. The results 
have been assembled for early publication. 
A few third, fourth, and fifth generation families were grown 
of Hybrid 50, Canadian & Markton, Hybrids 51 and 52, Early 
Champion * Markton, Hybrid 53, Victor * Markton, Hybrid 
56, Gothland & Markton, Hybrid 60, Monarch * Markton, 
Hybrid 61, Seizure & Victor, Hybrid 62, Scottish Chief Victor, 
Hybrid 63, Gothland X Monarch, Hybrid 64, Rossman X 
Monarch, Hybrid 65, Danish X Monarch, Hybrid 66, Danish 
Island * Monarch, Hybrid 67, Seizure X Monarch, and Hybrid 
68, Monarch X Scottish Chief, and some points in the inheritance 
of smut resistance were clarified. The various crosses involve 
interesting types of combinations of resistance to the Missouri 
