spots and blotches (Fig. 81). The _spleen_ may show no evidence of disease.
It may be large and soft, or even smaller than normal. The _liver_ may be
enlarged and dark, or mottled and light colored.

The _stomach_ and _intestines_ may show hemorrhagic spots and blotches.
Sometimes the gastric and intestinal mucous membrane is a brick red.
Ulceration of the mucous membrane is common (Fig. 83).

[Illustration: FIG. 83.--A piece of intestine from a hog that died of
chronic hog-cholera, showing appearance of intestinal ulcers.]

Small, red spots may be present on the surface of the _lungs_ (Fig. 82).
Scattered lung lobules or a large portion of the lungs may be inflamed. In
chronic hog-cholera, pleural exudation, adhesions and abscesses in the lung
tissue may occur. Inflammations of the pericardium and heart muscle are
less common lesions.

PREVENTIVE MEASURES.--Hog-cholera is the most widespread infectious disease
of hogs, and all possible precautions against its distribution to healthy
herds should be practised. Hogs coming from other herds and stock shows
should be excluded from the home herd until they are positively shown to be
free from disease. They should be quarantined in yards set off for this
purpose. The hogs should be cleaned by dipping or washing them with a
disinfectant. The quarantine period should be longer than the average
period of incubation. Three weeks is sufficient.

_The possible introduction of the disease_ into the pens by people, dogs,
birds and other carriers of the disease should be guarded against,
especially if cholera is present in the neighborhood. The exchange of help
at threshing and shredding time with a neighbor who has hog-cholera on his