124 Germ of the Southern Cattle Plague. 
On the other hand, the micro-etiological moment of the Southern 
Cattle Plague will with equal constancy present a growth of the most 
delicate straw color during the first day or so of its development, but 
which soon begins to show a delicate pinkish, red-yellow, and finally 
quite a decided brick-red-yellow shade, as the cultivation becomes anti- 
quated ; this reddish shade begins and grows most intense at the centre 
of the growth, leaving it more yellow toward its peripheries. 
THE DEPORTMENT OF THE GERMS OF SWINE PLAGUE AND 
SOUTHERN CATTLE PLAGUE IN BEEF-INFUSION GELATINE. 
As what is known to us as beef-infusion gelatine cannot be used 
in hot weather, or when the prevailing temperature is above 75° 
F. (23° C.), on account of its becoming fluid, I could not use this 
material until the last moment, and only prepared the first of the 
season on Saturday last, October 1, and on Sunday was enabled to 
inoculate tubes of this material with from pure cultivations of the 
germs of Southern Cattle Plague and hog cholera. This beef-infu- 
sion gelatine is an invaluable medium in the technique of bacteri- 
ology, for two essential reasons: First, being transparent, one can 
see what is going on on it, and, secondly, many micro-organisms 
cause the solid material to become fluid, and present peculiar phe- 
nomena to the eye, while others do not cause any change in it, but 
may grow in a peculiar manner. 
Now the hog-cholera germs belong to the latter class,as well as the 
germ of the German, French and English swine plagues, which are 
probably identical with hog cholera,as also those of hen cholera, and 
the peculiar disease known as “ wild Seuche” in Germany,which affects 
the deer tribe and cattle and hogs, and belongs to the same blood- 
poisoning group as hog cholera. When we take our hog-cholera 
germ,and inoculate tubes containing this beef-infusion gelatine from 
the pure agar agar cultures, we shall observe that the germs do not 
cause the gelatine to become fluid, and that it never becomes so, 80 
far as any influence of the hog-cholera germs goes, if the culture 
from which the material has been taken was a pure one, that 1% 
contained no other form of micro-organismal life than the germs <4 
of hog cholera. 
This germ, however, has other peculiarities; it slowly spreads 
1 The germ of the English Swine Plague was first discovered by a : 
in 1886, in some tissues from England belonging to my then assistant, = 
Dr. Bowhill, M.R.C.V.S. = 
