Bui. 108, U. S. Dept. of Agriculture. 



Plate I. 



Fig. 1.— Effect of Salicylic Aldehyde Extracted from Mount Vernon 

 Garden Soil on Wheat Seedlings. 



(1) Nutrient solution; (2) nutrient solution plus salicylic aldehyde; (3) distilled water; 

 (4) distilled water plus salicylic aldehyde. 



Fig. 2.— Effect of Salicylic Aldehyde on Wheat Seedlings in Water Solutions. 



(1) Control in distilled water; (2) same plus salicylic aldehyde 10 parts per million; (3) 25 parts 

 per million; (4) 50 parts per million; (5) 100 parts per million; (6) 200 parts per million. 



