BACTERIAL DISEASE OF TOBACCO. 445 
dirty white, anda typical plate is shown at Plate XXXVI, 
fig.1. Twodistinct types of growth however are obtained, 
round colonies with a smooth margin and dendritic colonies. 
The organisms from these, howexer, show the same mor- 
phology and give the same reactions on the sugars. 
This variation in the form of the colonies is remarkable, 
and one would expect to find two different organisms. IH. 
Smith, however, figures a petri-dish poured-plate from the 
cavity in stem of an inoculated plant showing the presence 
of a white organism producing branching colonies. A 
similar branching colony recovered from an inoculated 
plant in one of my experiments is shown at Plate XXXVI, 
fe. 2. 
Particulars of the cultures obtained from diseased plants. 
from Tamworth are given in Table III. Thus from three 
diseased tobacco stems three plates were poured. From 
the plates obtained two colonies on each plate were com- 
pared, there being only two types of colony on the plates. 
Plate 1, Col. 1, like each other in sugar reactions. 
Pe Col. 2, differed only in their plate growth, (1) being den- 
dritic, (2) circular. 
Plate 2, Col. 1, like each other in sugar reaction. 
Bs Col. 2, and resemble Cols. 1 and 2 of Plate No. 1, but 
differ from them in sugar reactions. 
Plate-3, Col. 1, like each other in sugar reaction. 
4: Col. 2, and similar also to Cols. 1 and 2 of Plate No. 
they resemble Cols. 1 and 2 of Plate Bi. ic in 
plate growth. 
Thus we have two types of growth, the dendritic and the 
circular in each plate, and two types of sugar reactions, 
those given by the organisms on Plate 1 and those given by 
the organisms on Plates 2 and 3. 
From these cultures tobacco plants were inoculated as. 
under :— 
Pot 1, Plants 3, Culture No. 1 (1) This organism was recovered at 
the end of 2 months. 
” 2, 9 2, ” 9 2 (1) ” 9 
