o7, 
were grown from a few seed obtainable from 6 of the blasted 
plants which did not contain any evidence of smut spores. Of 
these, 4 progenies contained more than 50 per cent. blasted heads 
with no evident smut spores; 1 progeny produced heads with a 
few blasted spikelets; and 1 gave 41.6 per cent. typically smutted 
heads, the rest being blasted. The blasted plants in these proge- 
nies were quite uniform as to the extent of the blasting. A fur- 
ther interesting point is the fact that a higher percentage of smut 
was obtained from the progeny of a blasted plant than has ever 
been obtained for Feterita. 
Fifteen progenies of the same hybrid, descended from survivors 
f second generation plants inoculated with the loose smut, were 
inoculated with the same smut and, on the basis of infection re- 
sults, could be classified in three distinct groups: 9 progenies free 
from smut, 6 giving from 4.3 to 17.6 per cent. infection, and 1 
giving more than 50 per cent. infection. 
~ 
Out of a total of 38 third generation progenies of a cross be- 
tween Dakota Amber Sorgo and Dwarf Yellow Milo inoculated 
with the loose smut, 7 gave more than 50 per cent. infection, 22 
from 5 to 50 per cent., and 9 contained no smutted plants. These 
descended from uninoculated second generation plants. The fig- 
ures indicate a 1:2:1 ratio. In 1934, sister progenies of these 
were grown, inoculated with the covered smut, and it is interesting 
to note that there is no indication of any correlation between sus- 
ceptibility and resistance to the two smuts. A progeny might be 
resistant to one and susceptible to the other. 
— 
There were 10 third generation progenies of a hybrid between 
two susceptible varieties grown. 
These descended from normal 
plants which had survived inoculation of the loose smut in the 
second generation. Of these, 8 gave from 56.5 to 95.2 per cent. 
infection, the others 19 and 32 per cent. Thus at least 8 of the 
second generation plants were genetically susceptible and had 
merely escaped infection, and it is probably that the other normal 
second generation plants were also escapes. 
A total of 418 plants belonging to 29 third generation progenies 
of a cross between Feterita and Dwarf Yellow Milo were inocu- 
lated with the loose smut and none of them was infected. These 
plants descended from second generation plants which had also 
