PLATE 106 
Inoculated leaf notches cut away and photographed July 27, 1920, and enlarged to 
show the small tumors distinctly. Each was produced by a single needle prick intro¬ 
ducing Bacterium tumefaciens (hop strain). Such shoots developed about a month after 
the inoculation and only from the inoculated notches. Most bore roots also, as in the 
lower shoot. X 5* 
