Germ of the Southern Cattle Plague. 123 
together (Fig. 2), or we may find two apparently mature organisms 
enclosed in a common capsule, the two medial dark points or poles 
being in such close apposition that no line of demarcation or inden- 
tation of the capsule can be seen at this point, the whole outer sur- 
face being smooth (Fig. 7). On the other hand, the two lateral 
ends, or free poles, are separated by the normal quantity of white, 
non-colorable substance. 
Again, these diplo-bacteria may assume a curved or sausage shape, 
which we may sometimes see intimated in the single organism, ma- 
ture (Fig. 8). At other times, though not very frequently, the 
germ may appear in nearly its normal form, but one pole (coccoid) 
end will be semisegmented from its appositional end of the white 
substance by a constriction of the same at its line of attachment 
with the pole end (Fig. 9). This end will then be smaller than the 
opposite pole, thus giving a sort of pear shape to the entire organ- 
ism: the small pole end is soon dropped, however, and becomes 
momentarily a free coccoid, and goes through the cycle of morpho- 
development already described; the same occurs with the other 
pole end. 
This concludes my observations of the micro-morpho-biological 
phases presented by these two micro-etiological organisms in the 
course of their development. There may be some minor phenom- 
ena that have escaped my attention, but I am very sure I have de- 
scribed all the essential points. 
THE SWINE PLAGUE AND SOUTHERN CATTLE PLAGUE GERMS 
DIFFERENTIATE THEMSELVES VERY SHARPLY BY THEIR 
APPEARANCE WHEN CULTIVATED ON POTATOES. 
If we properly prepare (see text-books) and sterilize some nice, 
clean potatoes, and then place them (lege artis) in a sterilized, moist, 
cultivating chamber, and inoculate the cut surface of some of the 
potatoes from Agar Agar, Boullion or other cultivations of the 
microdrganisms of these two diseases, we shall invariably find that 
they can be readily differentiated from one another in the course of 
from twenty-four to forty-eight hours after the surface of the pota- 
toes has been inoculated. The growth of the germs of the American 
Swine Plague will invariably present a peculiar brownish-yellow to the 
eye, reminding one of coffee color, especially the sion one gets in 
the ordinary boarding-house and restaurant.' 
1 Colin says “‘ greyish.” 
