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; (8) 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. 
