BACTERIAL DISEASE OF TOBACCO. 44] 
in which lactic bacteria act upon it, this is not a point upon 
which great stress can be laid. 
Dr. Honing, working on tobacco diseases in Sumatra, 
published eleven papers (1911-—1913)—these have been 
summarised by Erwin Smith. In paper (2) he states “The 
Deli-strain (in Sumatra) is somewhat more variable than 
Smith (in America) and Uyeda (in Japan) have announced. 
Because the Deli isolations have given three different 
results (in milk) depending on the age of the cultures and 
on the kind of milk used, the possibility is not excluded 
that Uyeda actually had another bacterium.”’ 
For the purpose of comparison, Erwin Smith’s characters 
of Bact. solanacearum are given. They are followed by 
Table I. in which are given the characters of the bacterium 
which has been isolated from potatoes in New South Wales. 
In Table II are given the characters of another bacterium 
which has been isolated from tomato plants in New South 
Wales, showing a wilt-disease and which agrees in very 
many respects with Bact. solanacearum. 
- From ‘Bacteria in Relation to Plant Diseases,’ by Erwin Smith 
ively an, p. 199. 
Brown Rot of Potatoes (Bacteriwm or Pseudomonas solanacearum). 
Named Bacillus solanacearum by Erwin Smith in 1896. It is 
motile by means of one polar flagellum, and therefore should be 
classified as Bacterium or Pseudomonas solanacearum. This is a 
specific communicable disease of Potatoes, ‘Tomatoes, Egg-plants, 
etc. In potato tubers it rots the region of the vascular ring. The 
organism is a short rod often termo-like with rounded ends, often 
occurs in pairs, usually 4°59 by 1:5 mu, no spores, 
Sugars—No acid or gas. 
Milk—Converts slowly to alkaline translucent fluid. 
Litmus-milk—Gradually changes to indigo or hyacinth blue. 
Gelatine—Does noé liquefy. 
Gram.—Negative. 
