PLATE 102 
Crowngall embryoma on Bryophyllum calycinum. The hop strain of Bacterium 
tumefaciens was inoculated in upper leaf axils January 13, 1920, from a 5-day agar 
streak by needle pricks. Many of the tumor shoots were red or purplish red. Photo¬ 
graphed June 2, 1920. See Dr. Levine’s conclusion No. 4. 
