large number of varieties of barley to the different races. How- 

 ever, it seems clear that some races of the smut are confined to a 

 relatively few varieties. The races originally designated as 

 " Hannchen " and " Xe]>al " races seem to belong to this class. It 

 is quite evident that the " Hannchen " race will not infect Nepal, 

 nor will the " Xepal " race infect 1 lannchen. There are. however, 

 other races which seem to be capable of infecting a much wider 

 range of barley varieties, one. for example, which appears to be 

 capable of attacking both Hannchen and Nepal. Tt is also true 

 that some varieties of barley seem to be susceptible to many dif- 

 ferent races of covered smut. 



The Inheritance of Resistance in Sorghums to Covered 



The studies on the inheritance of resistance of certain crosses 

 between sorghum varieties to covered kernel smut ( Spliaeelotheca 

 sor(jhi) were continued. Additional second generation plants of 

 the crosses referred to last year were grown, together with inocu- 

 lated plants of both the resistant and susceptible parents. Two 

 different plantings of each hybrid were made on two different 

 dates, and the results obtained from the two sets of experiments 

 varied rather widely. 



The second generation plants of resistant Feterita and sus- 

 ceptible Sumac Sorgo gave 48.1 per cent, infection. 65 plants out 

 of a total of 135 being infected. In another family of this same 

 cross 34.6 per cent, of the plants were infected, or 53 out of a 

 total of j 53. The results with Sumac Sorgo, the susceptible 

 parent, were considerably lower than in the previous year, only 

 49.2 per cent, of the plants being smutted, 67 being grown in the 

 different series. 



Three second generation progenies of new crosses between 

 Feterita and Dawn Kafir were grown. Dawn Kafir is very sus- 

 ceptible to the covered kernel smut, in contrast to the resistant 

 Feterita. In one progeny 41.6 per cent, of the plants were in- 

 fected, in another 50. 2 per cent, and in a third, 40.3 per cent. The 

 susceptible Dawn Kafir used in connection with the same experi- 

 ments gave 65. r per cent, infection. 



