PLATE i 
A. — a , A spinach plant killed by blight; 6, an apparently healthy plant; c, d, and 
e, plants in progressive stages of the disease. (Original.) 
B. —A spinach field near Norfolk, Va., in which scattered blighted plants occur. 
As these are yellow, they show light in the illustration. Photographed in January, 
1917. (Original.) 
