Germ of the Southern Cattle Plague. 115 
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TEE e > Cukpacrantsrici OF THE GERMS OF THE 
SOUTHERN CATTLE PLAGUE AND THE AMERICAN SWINE 
PLAGUE AND THEIR Pornts OF DIFFERENTIATION.' 
These two micro-organisms are neither to. be classed with 
Micrococci or Bacilli. They are not round objects like the for- 
mer or rods like the latter. They belong to the intermediate 
group, to which the name “ bacteria” has been given. Their longi- 
tudinal dimensions are about twice that of their transverse. They 
are ovoid. Their ends are rounded. If an endeavor be made to dif- 
ferentiate these germs from one another by a microscopic examina- 
tion we shall find it impossible. They are approximately of the 
same size and shape. Fresh specimens of them both will not differ 
so much in dimensions as old cultures of either will from fresh 
ones, or different individuals iu the same old cultures. They are 
description will answer in nearly every particular and every chief 
essential. The only points where a difference may be found will be 
these :— 
1. The yellow-fever germ may cause gelatine to become fluid but pro- 
bably not as no other of these germs does. 
2. It may grow differently on potatoes and egg albumen. 
In this regard attention will be called to the difference between the. 
germs of the Southern Cattle Plague and Swine Plague when developed 
on potatoes. Now I have still another and hitherto unknown germ of 
this same group of which more will be heard later on. 
On potatoes, the Swine-Plague germ grows a light gray-brown, coffee- 
colored; the Cattle-Plague germ in yellow colonies becoming reddish, 
this new germ pure white. 
On whites of eggs, the Swine-Plague germ grows in a semi-fluid 
almost pure white colony, difficult to see. 
The Cattle-Plague germ develops in a delicate buff color with sharply 
circumscribed walls, while the new organism grows in deep yellow 
colonies with diffuse edges. However, I feel that aside from these 
points, the description herein given will answer completely for the germ 
of the yellow fever. Morphologically it cannot be distinguished surely 
from either of them 
1 With the exception of the points to which attention has been called 
_ as to the germ of Yellow Fever. 
