32 



Black Dry Rot in Swedes. 



determine the presence, of a single polar flagellum, and, 

 hence, adopting- Migulas Classification, it must be placed in 

 his genus Pseudomonas % For special specific characters and 

 determination of ferments, etc., a more prolonged investiga- 

 tion is required. 



That the Black Rot is produced by this bacterium is 

 established by the following facts : — 



1. The bacterium is always present in the diseased tissues. 



2. It has been isolated from the diseased tissues and 



cultivated in various media. 



3. The disease is produced, with all its characteristic 



symptoms, upon healthy tissues, after inoculation 

 with the bacterium from pure cultures. 



4. The bacterium is found pervading the tissues in 



which the disease has been artificially produced by 

 inoculation, and from these it has been re-isolated. 



M. C. Potter. 



