PLATE XXII 



Teratoid crowngalls produced in a tobacco plant by inoculating Bacterium tume- 

 faciens (hop strain through sunflower) into the leaf axils. Small tumors soon appeared 

 where inoculated and these are now covered with pale leafy shoots which have swollen 

 (tumefied) bases and are beginning to die. The top was cut away on the 26th day, 

 and the plant was unable to make a new one out of these pathological shoots, but has 

 grown it (X) from an uninoculated lower leaf axil. Time, 73 days. 



