Bui. 279, Bureau of Piant Industry, U. S. Dept. of Agriculture. 



Plate III. 



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Fig. 1.— Leaf Prints of Potato from all Sections of Beds A and B at the End 

 of 30 Days. Shades as Numbered; 1 Indicates Least Illumination and 6 

 Normal Light. 



Fig. 2.— Leaf Prints of Corn from Beds A and B at the End of 30 Days. 

 Shades as Numbered, Ranging from 2 (n/15 Light) to 6 'Normal). 



