Bui. 164, U. S. Dept of Agriculture. 



Plate IV. 



Cow Pee 



Fig. 1.— Yield of Cowpeas, Vines, and Pods on Check Plot a and on Vanillin- 

 Treated Plot. 



Gar-den Peas 



Fig. 2.— Yield of Garden Peas, Vines, and Pods on Check Plot a and on Vanillin- 

 Treated Plot. 



Srr- - = Beans 



Untreated 



&& - .-.I r: 



Fiq. 3.— Yield of String Beans, Vines, and Pods on Check Plot a and on 

 Vanillin-Treated Plot. 



