PLATE 37 



A. — Two leaves of a lettuce plant inoculated by spraying with Bacterium viridili- 

 vidum isolated from Virginia lettuce. Photographed 37 days after inoculation. 



B. — Cross sections of stems of lettuce plants inoculated with the Virginia yellow 

 organism (Bact. vitians), which is the same as the South Carolina lettuce organism. 

 At the right sections of two healthy stems are included. 



