Levine: Studies on Plant Cancers 11 



Fig. 8. A branch of Ficus elastica actively growing twelve months after 

 having been inoculated with Bacterium tumefaciens. Two galls formed " A," 

 and " B," " C," on opposite sides of the stem showing the smooth and nodular 

 types of crown galls. Two branches are growing through the smooth crown 

 gall. 



Fig. 9. Cross section of stem between the upper and lower crown galls 

 corresponding to level indicated by the line " BB " in figure 8. The gall to 

 the left is of the smooth kind, being covered by corky patches. 



Fig. 10. Cross section higher up on the stem corresponding to the level 

 indicated by the line " CC " in figure 8. Shows large brown necrotic area and 

 the undisturbed cylinder of the main stem " X " with bundles of fibers going 

 to branches " Y " and " Z." 



