PLATE 2 1 
A. —Portion of an experimental castor bean field at Orlando, Fla., upon which 
observations were made and experimental sprayings conducted in 1919. Note in 
addition the cloud effects which are typical of the summer season in most parts of 
Florida. A shower has just occurred in the distance from clouds shown in the upper 
left-hand comer of the picture. A storm is rising in the other direction, as evidenced 
by the large dark cloud shown. Such storms pass over quickly and are followed 
immediately by sunshine, but their frequency, combined with the relatively high 
humidity, is conducive to the rapid spread of the gray mold. 
B. —A single Bombay type castor bean plant, the majority of whose spikes are 
affected with the gray mold. De Land, Fla., August 22, 1918. # 
1 All photographs used in illustrating this paper were taken by the author except where otherwise indi¬ 
cated. 
