279 



124.5 degrees F., showed over one per cent, of smutted heads in the result- 

 ant crop. 



Hot water treatment. —Only two periods of treatment were tried with 

 hot water; these were for five and ten minutes. The range of temperature 

 tried was from 130 degrees F. to 100 degrees F. The highest temperature 

 used was considered the lowest point at which the treatment of wheat seed 

 could be expected to prove effective, and it was therefore taken as the 

 starting point in the work. As this temperature proved effective in killing 

 the spores, a lower one was tried and so on until the lowei- liiuit of effect- 

 iveness was reached. The results of the work, which are presented in 

 Table III, shoAV that the lower limit of effective treatment was 110 degi'ees 

 F, for five minutes and 105 degrees F. for ten minutes. 



TABLE III. 



Oermination of Spores Treated With Hot Water. 



