ttOG CHOLftUA. 
11 
then caseous. The inflammation also extends to the pleura, and 
sometimes causes it to become attached to the thoracic walls. 
Sometimes cavities are found between the adherent pulmonary and 
costal pleura, which contain a yellowish, turbid liquid ; and 
frequently the diaphragm is firmly attached to the principal lobe. 
The parts of the lung first attacked become converted into homo¬ 
geneous greenish or yellowish white masses, sharply defined from 
the surrounding tissue, and caseous in nature. This lesion is gen- 
erally limited to a few lobules, but in some cases the whole lobe 
* is involved. 
Generally there are no intestinal lesions, but sometimes these 
are present, and on superficial examination might easily be con¬ 
founded with hog cholera ulcers, particularly if the difference be¬ 
tween the two had never previously been recognized. Doubtless 
this superficial resemblance in the intestinal changes seen in the 
two diseases may account for peculiarities in the descriptions of 
swine-plague by some authors which cannot well be explained in 
any other way. 
The intestinal lesion in swine-plague is a yellowish croupous 
exudate, attached to the mucous surface in irregular masses vary¬ 
ing greatly in size. This exudate may be easily detached, when 
the mucous membrane beneath it is found to be pale and slightly 
depressed. At a later stage, in severe cases of the disease, when 
the inflammation has a diphtheritic rather than a croupous char¬ 
acter, the necrosed mucosa sloughs off, leaving a superficial erosion 
or a shallow ulceration. 
This malady, so distinct in its lesions, is associated with and 
undoubtedly caused by a microbe which differs radically from that 
found in hog cholera. When stained by an aqueous solution of 
methyl violet or an alkaline solution of methyline blue the two 
extremities of the longer axis are deeply stained, while between 
these colored masses there is a transverse band without any color, 
bounded on the sides by a very faint line. These microbes so 
stained are oval and 1 to 1.2 micromillimeters in length by 0.6 to 
0.8 of a micromillimeter in breadth. When grown in liquid cul¬ 
tures and examined fresh, instead of an oval it presents the ap¬ 
pearance of a double micrococcus, that is of two spheres united at 
