THE BLACK ROT OF CRUCIFERSI TECHXIC 



151 



a 



b 





FIG. 90. Surface and buried colonies of Bacterium campestre (New York iso- 

 lation of 1908) at end of 10 days in +14 beef peptone agar. Crystal at x. Colo- 

 nies coming to the surface at a, b. Photographed February 11, 1919, by direct 

 transmitted light. X 10. Tested on Crucifers Feb. 9, 1919. 



