244 



BACTERIAL DISEASES OF PLANTS 



Fig. 1S5. — A celery plant inoculated by needle-pricks with Worniald's Bacillus 

 apioi'orus in the central part. Inoculated May 11, 191o. Photographed May 

 17. One inoculated leaf-stalk broken over, another dis(>ased and discolored 

 but still erect. 



