eal 
cn 
generation progenies of these hybrids grown. They were all 
inoculated with Ustilago Avenaec—Fulghum, a smut which se- 
verely attacks one of the parents—I*ulghum—but does not infect 
the other—Black Mesdag. Of these 98 progenies, 27 were re- 
sistant, 47 segregating, and 24 susceptible. 
Third generation progenies of the following hybrids were also 
grown: Hybrid 50, Canadian & Markton, Hybrid 51, Early Cham- 
pion * Markton, Hybrid 53, Victor X Markton, Hybrid 56, Goth- 
land & Markton, Hybrid 60, Monarch X Markton, Hybrid 62, 
Scottish Chief & Victor, Hybrid 63, Gothland & Monarch, Hy- 
brid 65, Danish & Monarch, Hybrid 66, Danish Island & Mon- 
arch, Hybrid 67, Orientalis & Monarch, and Hybrid 68, Monarch 
x Scottish Chief. In the series with loose smut, there was a total 
of 560 progenies and in the corresponding series with covered 
ear 
smut there was a total of 618 progenies. 
There were a few fourth generation progenies of some of these 
— 
same hybrids. Much additional material of these will be available 
for the coming year. 
During the past year, the extensive data previously obtained 
with Hybrid 16, Gothland & Victor, were published; the results 
for the second, third, and fourth generations were included. The 
extensive data secured on the inheritance of resistance to loose 
and covered smut in hybrids of Hull-less and Gothland and Mon- 
arch oats were also published. 
The first generation plants of several new oat crosses were 
grown, and the second generation of these hybrids will be avail- 
able for study during the coming year. A few additional crosses 
involving still further combinations of smut resistance were made. 
Physiologic Races of Oat Smuts 
Much additional work was done in determining the character- 
istics of some of the oat smut races. Several new collections of 
both loose and covered smuts were available for comparison. The 
data secured indicate definitely the existence of still further addi- 
tional races of both smuts. There is distinct evidence also that 
the loose smut which occurs on Fulghum oats is differentiated into 
fe 
more than one race; distinct specialized races can be separatec 
out by the use of suitable varieties. 
