PLATE 30 
Ceiling of upper treated intemode of plant 2 of Ricinus communis , which was injected 
with i-to-1,200 ammonia water on August 15, 1916. It shows lobed tumors from the 
center and also from a dozen places on the side walls. There was here no trace 
of killing action (surface specking) of the pith. Photographed on September 9, 
1916. X$- 
