PLATE 35 



Sections of oat leaves through halo lesions, showing bacteria in the tissues. Fixed 

 in Gilson's fixative and stained with carbol fuchsin. 



A. — Bacteria in substomatal cavity, showing method of entrance of bacteria into the 

 leaf tissue. Cut 15 m thick. X 700. 



B. — Bacteria in substomatal cavity. Cut 15 ^ thick. X 1,650. 



C. — Section of older lesion, showing bacteria between the cells. In the upper 

 part of this section the tissue is disintegrating at about the point of infection. 



Photographed August 26, 1919. X ii550- 



