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. 
