I9I4] 



/. /. Skinner 



397 



also different smaller amounts of nitrate and potash stated in p.p.m. 

 of P2O5, NH3 and K2O. In the fourth column is given the green 

 weight of the plants grown in Solutions which contain no salicylic 

 aldehyde, and in the fifth column is given the weight of the plants 

 in Solutions which contain 10 p.p.m. of salicylic aldehyde. 



By comparing the two last columns in Table 4 it is seen that the 

 green weight of the salicylic aldehyde culture is less in every case, 

 with one exception only, than the green weight of the culture of the 

 same fertilizer mixture without the salicylic aldehyde. The total 

 green weight of the 21 normal or control cultures was 39.61 gm. 

 against 31.74 gm. for the 21 cultures with saHcylic aldehyde. 



Table 5 gives the data for effects of salicylic aldehyde in nutrient 

 Solution in which the principal ingredient is nitrate. 



TABLE 5 



Effect of salicylic aldehyde ort wheat in nutrient culture Solutions, composcd 



princinally of nitrate 



As seen in the fourth and fifth columns of Table 5, the growths 

 in cultures with salicylic aldehyde are much smaller than the growths 

 in Solutions containing merely the nutrient salts. The total green 



