520 



BACTERIAL DISEASES OF PLANTS 



Fig. 'MO. — Photographs showing small tumors developing under the cut surface 

 (cork-layerj of a raw potato which was sealed into a very limited air space: (A) 

 Front view; (B) upper surface of A; (C) lower surface of A. The cork-layer is 

 ruptured in places. Block enclosed in a test tube May 2, 1917, and sealed in with 

 sealing wax^ At X one of the tumors has developed a bud. Photo. Sept. 25, 1917 



