4. 
However, none of the facts obtained were in any way seriously 
opposed to this interpretation. 
It is a mistake, however, to assume that the inheritance of re- 
sistance to both smuts is always the same. It seems to be true 
that in the hybrids between Hull-less and Black Mesdag the re- 
sistance to both smuts is inherited in exactly the same fashion. 
It certainly does not apply to crosses involving such varieties 
as Karly Gothland & Victor and Monarch & Hull-less. In these 
hybrids, one parent is susceptible to both smuts, while the other 
parent is resistant to one, but susceptible to the other. Such crosses 
serve to indicate quite clearly that the loose and covered smut do 
not always behave the same in their reaction on different varieties. 
As previously noted, the hybrids between Early Gothland and 
Victor were particularly interesting because both parents were 
susceptible to the loose smut, while Early Gothland is resistant 
to the covered smut and Victor is susceptible. The second gen- 
eration data indicated a segregation in which resistance was dom- 
inant and susceptibility recessive to the covered smut, 44 second 
generation plants being inoculated, of which 8 (18.1 per, cent.) 
were infected. The third generation progenies of many of the 
surviving second generation plants have been grown and the re- 
sults obtained were in fair harmony with those secured in the 
second hybrid generation. A number, of fourth generation 
progenies were also grown, being selected on the basis of their 
resistance in both the second and third generations. They all 
proved to be entirely resistant to the covered smut in this gen- 
eration, 
Second generation plants of hybrids between Early Champion 
and Black Mesdag were also grown. The [arly Champion variety 
is highly susceptible to both loose and covered smut, while Black 
Mesdag is very resistant. In the second hybrid generation, 278 
plants were inoculated with loose smut and 62 (22.3 per cent.) 
were infected and, in a similar series with the covered smut, 262 
plants were inoculated and 51 (19.4 per cent.) were infected. The 
resistant parent, Black Mesdag, grown in these experiments, 
showed complete absence of infection, while practically all of 
the inoculated plants of the Early Champion variety were smutted. 
Special interest attaches to the results with the second genera- 
