58 



susceptible to this parasite, with tliese two crosses in the second 

 generation, segregation of resistant and susceptible individuals 

 was obtained. With Early Gothland X Victor less than 25 per 

 cent, of the second generation plants were infected, while with 

 Early Gothland X Hull-less, considerably more than 25 per cent, 

 were infected. In the third generation there was obtained an 

 exceptionally large number of resistant families in the first cross, 

 while in the second there were relatively few. Thus the results 

 obtained with the third generation seem to harmonize fairly well 

 with those obtained with the second generation, but the two sets 

 of hybrids show obvious differences in their behavior. 



Other third generation progenies included 243 of the hybrid 

 Monarch X Idull-less inoculated with the loose smut, 99 progenies 

 of Fulghum X Black Afesdag inoculated with the Fulghum Race 

 of loose smut. 67 progenies of Silvermine X Black Mesdag, and 

 55 progenies of ILarly Champion X Black Mesdag inoculated with 

 the loose smut. In the case of these last two hybrids, seed of most 

 of the same progenies were also inoculated with the covered smut. 



For the most part, the results obtained with these progenies are 

 in harmony with the data secured on the second generation plants. 

 The second generation of Monarch X Hull-less has given slightly 

 more than 30 per cent, of infected individuals, and among the third 

 generation progenies there was an excess of segregating and sus- 

 ceptible families. The ]^rogenies of Silvermine X Black Mesdag 

 and Early Champion X Black Mesdag showed a similar behavior 

 to both loose and covered smut. 



A large number of F, jilants involving many varieties differing 

 in their reaction to the smuts have been grown and the seed for 

 growing the second generation has been obtained. Many of these 

 have been planted in the greenhouse and additional ones will be 

 grown in the field. 



Artificial iUuuiitniiiou of oal Jn'l'i'ids 



During the ])ast season the use of artificial light for hastening 

 the growth of oat plants was tried out. The seed of a number of 

 crosses made in the summer of 1928 were ]:)lanted in the green- 

 house in the early winter. Ordinarily, such i)lants would mature 

 in the following Afay or June. They were illuminated by electric 



