236 



BACTERIAL DISEASES OF PLANTS 



FIG. 178. Original stock of B. carotovorus (Jones' 3a, received from him in 

 1920). Photographed after 3 days at 25 on + 14 beef-pepton agar, showing 

 surface and buried colonies. Y is a buried colony beginning to come to the sur- 

 face, X is a young thin colony. Photographed, X 10 by oblique transmitted light 

 for comparison with Fig. 177. The colonies are smooth on the surface and show 

 internal wavy markings by oblique transmitted light. Still infectious to carrot. 



