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



Plate V. 



Fig. 1.— Effect of Aldehyde Extracted from Garden Soil 

 (No. 2, Table IX) from Mechanicsburq, Pa., on Growth. 



(1) Distilled water; (2) distilled water plus aldehyde. 



Fig. 2.— Effect of Aldehyde Extracted from a Poor Garden 

 Soil (No. 4, Table IX) on Wheat Seedlings. 



(1) Distilled water; (2) distilled water plus aldehyde from garden soil. 



