Bui. 1 64, U. S. Dept. of Agriculture. 
Plate II. 
Fig. 1.— Effect of Vanillin on Wheat in Florida Sand. 
[No. 1, Soil untreated; No. 2, vanillin 100 p. p. m.; No. 3, vanillin 200 p. p. m.; No. 4, vanillin 
300 p. p. m.; No. 5, vanillin 400 p. p. m.; No. 6, vanillin 500 p. p. m.) 
Fig. 2.— Effect of Vanillin on Wheat in Susquehanna Sandy Loam. 
(No. 1, Soil untreated: No. 2, vanillin 100 p. p. m.; No. 3, vanillin 200 p. p.m., No. 4, vanillin 
300 p. p. m.; No. 5, vanillin 100 p. p. m.; No. 6 vanillin 500 p. p. m.) 
Fig. 3.— Effect of Vanillin on Wheat in Hagerstown Loam. 
(No. 1, Soil untreated; No. 2, vanillin 100 p. p. m.: No. 3, vanillin 200 p. p. m.; No. 4, 
300 p. p. m.; No. 5, vanillin 400 p. p. m.; No. 6, vanillin 500 p. p. m.) 
vanillin 
