500 



BACTERIAL DISEASES OF PLANTS 



FIG. 376. Under-surface of cauliflower leaf showing overgrowths due to 

 formic acid water O^oo)- Leaf sprayed March 24, 1917. Tumors not so well- 

 developed as on plants sprayed with Koo formic acid water, i.e., not raised so 

 high. The very small round tumors are undoubtedly due to entrance of the acid 

 in a minimum quantity through a single stoma. Photographed March 31, 1917. 

 X 4, nearly. 



