152 



BACTERIAL DISEASES OF PLANTS 



Fig. 91. — ,4, B. Surfac;e and buried colonies of Bacterium campestre (isolated 

 from D. C. rape) at end of 13 da,ys on +14 beef-peptone agar plates. Four crystals 

 are present, 3 in colonies. X is a buried colony coming to the surface. Photo- 

 graplic<i hy trnnsniittcd (,Mi()uc liglit. Fcl.iii.'uy 13, 1919. X 10.'' 



