Fusarium in Tuber Rot and Wilt of Potato 



39 



bility permitted only N/200 solutions. In the case of the higher 

 fatty acids and oils, the material was weighed out as though N/100 

 solutions were being prepared. With these no weighings of the 

 material formed were attempted, but merely differences in luxuri- 

 ance of growth were recorded. To those acids which showed no 

 growth with N/100 solutions, 5 cc. of 10 per cent glucose solution 

 was added, making the sugar concentration 1 per cent, so as to 

 determine whether the acid was merely non-usable, er whether 

 it was toxic. Since it was found that some were toxic at N/100 con- 

 centration, lower concentrations were made up also. The results 

 are given in table IX. 



TABLE VIII 



Dry weight (in milligrams) formed with the following carbon compounds 

 as carbon sources 



