VANILLIN AND SALICYLIC ALDEHYDE 



373 



in the solutions without vanillin are given in the fifth column, 

 and with 100 parts per million of vanillin in the sixth column. 

 The absorption of the nutrient salts is given in the remainder 

 of the table. 



TABLE 1 

 Effect of cowpeas in nutrient solution with and without vanillin. 



June 17- July 8 



{100 p.p.m.) 



The gi'een weight was reduced by the vanillin in each culture 

 except No. 5. When the cultures are grouped as in the table 

 according to their composition it is seen that the vanillin is 

 least harmful in those cultures which are composed principally 



