534 



BACTERIAL DISEASES OF PLANTS 



Fig. 402.— Shoot of White McCorinick potato from a pared sterile block 

 cut from a potato tuber and sealed into a test tube on wet cotton, February 18, 

 1919, and held in very dull light at 23° to 25°C. Base and middle covered with 

 intumescences, ruptured and unruptured. Shoots and roots dying, of asphyxia- 

 tion. Photographed March 22. X 5. 



