4Q 



Research Bulletin No. g 



TABLE Will— Continued 



A marked difference was found in the ability of the two organ- 

 isms to use the fatty acids, F. trichothecioides being much more 

 restricted in its ability. The experiments with alcohol and the 

 acids also showed that the former organism was much more readily 

 poisoned and inhibited in its growth. It was found that F. oxy- 

 sporuni grew well in i per cent ethyl alcohol, and that F. trichotheci- 

 oides made no growth. The solution was then diluted one-half, 

 whereupon F. trichothecioides made a good growth. This was 

 clearly a case of inhibition. The growth of F. trichothecioides was 

 inhibited by N/ioo acetic acid, as can be seen by the fact that it 

 grew in N/125 concentration and that it grew in N/100 when glu- 

 cose was added, while F. oxysporum grew well in N/100 acetic acid. 

 N/100 formic acid was toxic to F. trichothecioides, while it merely 

 inhibited growth with the other organism. The latter grew in 

 N/i25Jormic acid, while F. trichothecioides did not grow in N/500 

 solution. N/100 proprionic acid was toxic to both, while both 



