486 



BACTERIAL DISEASES OF PLANTS 



Fig. 364. — Ricinus .stem in lonfi;itudiiuil .section showing tiuuurs produced 

 by exposure to the vapors from 0.2 cc. of a 20 per cent solution oi monobasic 

 ammonium phosphate held in a small serum tube resting on the next septum below. 

 The unopened internodc above shows its base also tumefied. 



