20 



CAUSE AND NATURE OF CROWN-GALL 



Fig. 2. -Diagram showing almond seedlings growing under old diseased trees in 

 the Glendale orchard. The small central circles represent the old trees ; the dots in- 

 dicate the position of undiseased seedlings, and the crosses seedlings with galls upon 

 them. The outer circle represents an area six feet in diameter. 



