PLATE E 



I. — Bacterium ■viridilividnm , second organism isolated from Virginia lettuce: Appear- 

 ance of the gro\vth on potato at the end of 2 days. 



2.—Bacierii(m viridilividuv: , original organism from Louisiana: Appearance of the 

 growth on potato at the end of 2 days. Later, the upper part of tne fluid becomes 

 buff colored. 



3. — Bacterium vitians, first organism isolated from Virginia lettuce: Appearance of 

 the growth on potato at the end of 2 days. 



4. — BcLcterium vitians, isolated from South Carolina lettuce: Appearance of the 

 growth on potato at the end of 3 days. 



5. — Bacterium marginale, isolated from Kansas lettuce: Appearance of the growth 

 on potato at the end of 2 days. 



6. — Bacterium marginale, isolated from Kansas lettuce: Appearance of the growth 

 on potato at the end of 13 days. 



Painted by Mr. James F. Brewer. 



