PLATE i 
A. —Flagella of Bacterium citrarefaciens from 24-hour-old agar slant. Stained by 
Ldffler’s method. X 1,000. 
B. —Filamentous bodies showing thickened areas of denser protoplasm from saccha¬ 
rose bouillon cultures of Bact. citrarefaciens. Stained with carbol-fuchsin. X 450. 
C. —Cross section of a navel-orange leaf affected with Citrus blast. Stained by 
Mallory’s ferric-chlorid hematoxylin method. A few individuals and several masses 
of Bact . citrarefaciens may be observed. 
