Bui. 279, Bureau of Plant Industry, U. S. Dept. of Agi cu hire. 



Plate V. 



Fig. 1.— Leaf Prints of Cotton from Beds A and Bat the End of 30 Days. 

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



Fig. 2.— Leaf Prints of Radish from Bed B at the End of 30 Days. Leaf 

 Prints of Bed A Exhibit no Essential Differences from those here 

 Shown. Shades as Numbered, Ranging from 2 in 1 5 Light; to 6 (Normal). 



