GO 
varying from 5.5 to 31.2. The remaining 25 progenies contained 
no smutted plants. 
There were 30 third generation progenies of the hybrid Dwarf 
Yellow Milo X I*eterita. This hybrid is the reciprocal of the one 
just referred to. Only one of these progenies contained an in- 
fected plant, and in this progeny one plant out of 14 was smutted. 
There were 170 fourth generation progenies of two hybrids of 
leterita & Sumac Sorgo grown. These were descended from the 
surviving plants of third generation progenies which gave different 
percentages of smut, and the results obtained have thrown a great 
deal of light on the inheritance of smut resistance in these par- 
ticular hybrids. 
One of the important problems in connection with these studies 
is that of securing the infection of all susceptible individual plants. 
Further experiments were made on the influence of environal 
factors on the infection of some susceptible and resistant varieties. 
It was found that a much ligher percentage of smutted plants of 
such susceptible varieties as Blackhull Kafir, Dawn Kafir, Dakota 
Amber Sorgo, Sumac Sorgo, and Red Amber Sorgo, was secured 
when the inoculated seed were germinated in sand with a low per- 
centage of water. Excellent results were also obtained when a 
somewhat higher percentage of moisture was used, to which a 
weak sugar solution was added. In all cases, resistant varieties 
such as Feterita and Milo remained free from smut. In general, 
all the susceptible varieties and the hybrids gave higher percent- 
ages in 1933 than in 1932, probably due to securing an environ- 
ment more favorable to infection during the seedling stage. 
A large amount of data on the inheritance of various mor- 
phological features in relation to smut resistance has been ob- 
tained. The most extensive studies have been made on the 
inheritance of pithy and juicy stem, and on the red and green 
color of seedlings. 
Cultural Characteristics of the Oat Simuts 
Mr. L. Gordon Utter has continued his studies on the char- 
acteristics of both loose and covered smut of oats as grown in 
cultures in flasks. Under natural conditions, the smuts are para- 
sites which invade the host plant in the young seedling stage and 
