shows a disposition to leave its feed in order to eat these injurious and
innutritions substances. In ruminants, the wool or hair may form balls and
obstruct the opening into the third compartment, causing chronic
indigestion and death.

_The treatment_ consists in the removal of the cause. Feeding a ration that
meets the needs of the system, clean quarters and plenty of exercise are
the most important preventive lines of treatment. In such cases medicinal
treatment (saline and bitter tonics) may be indicated. It is usually
advisable to remove the affected animals from the herd or flock in order to
prevent others from imitating them.

DISEASES OF THE STOMACH

There is a remarkable difference in the development of the stomachs of
solipeds and ruminants.

The horse's stomach (Fig. 8) is simple and has a capacity of three or four
gallons. The left portion is lined with a cuticular mucous membrane, and
the right portion with a glandular mucous membrane that has in it the
glands that secrete the gastric juice. The most important digestive change
in the feed is the action of the gastric juice on the proteids and their
conversion into the simpler products, proteoses and peptones.

[Illustration: FIG. 8.--Photograph of model of horse's stomach: left
portion, oesophagus, right portion, and intestine.]

[Illustration: FIG. 9.--Photograph of model of stomach of ruminant: rumen,
reticulum, omasum, and abomasum.]