408 RINDERPEST 
after the animal seems to be improving. These cases usually die in 
from 3 to 4 weeks. 
The prognosis is not favorable. The mortality ranges from 60 to 
90 per cent. 
Morbid anatomy. Authors differ somewhat on the lesions charac- 
teristic of this disease. Walley has pointed out the fact that none 
of the morbid changes are constant and consequently they vary with 
the stages of the epizodtic and the condition of the animal. There is 
always emaciation, the muscles are dark and the capillary congestion 
is marked. All the tissues of the body may be the seat of effusions, 
exudations and blood extravasations. If symptoms referable to the 
nervous system have occurred, brain lesions will be found at post- 
mortem. 
The muscle of the heart is pale and relaxed. Blood extravasations 
may be found beneath the pericardium especially along its coronary 
grooves. The kidneys are usually the seat of congestion or ecchy- 
moses either beneath the capsule or in the cortical structure. There 
are also parenchymatous changes. The liver is congested, often giv- 
ing a mottled bile stained appearance. The lymphatic glands are 
usually enlarged and the mesenteric glands are often hyperemic or 
even hemorrhagic. 
The structures most often affected are the mucous membranes of 
the digestive, respiratory and genito-urinary tracts and the skin. 
Nodules and pustules are sometimes found on the skin, especially 
of the udder and abdomen. The mucous membrane of the mouth 
and pharynx is congested in spots, swollen and exhibits rounded, 
yellowish gray, caseous plates or deposits. The removal of plates 
discloses erosions and highly congested depressions in the mucous 
membrane, the so-called erosion ulcers. These changes are most 
marked on the inner surface of the lips, palate, walls of the pharynx 
and base of the tongue. Congestion and erosions are sometimes 
found in both the trachea and esophagus. 
In the first three stomachs the mucous membrane is usually normal 
or slightly congested in spots, and the epithelium is so loose that it can 
be easily detached. The contents of the rumen and reticulum are soft 
and those of the omasum are often dried, rarely they are fluid. Gener- 
ally the abomasum is empty or contains a small quantity of foul 
smelling liquid and mucus or sanious material... Its mucous membrane 
is highly congested, especially in the neighborhood of the pyloric 
orifice. The congestion is partly diffuse, partly in spots, in the form 
