paleness of the mucous membranes
become manifest. These symptoms are accompanied with a gradual diminution
of the milk secretion. The debilitated condition of the animal is also
manifested by a staring coat and a tough, dry, harsh skin (hidebound).
Digestive disturbances are indicated by tympanites, or distention of the
rumen by gas, colic, and diarrhea, alternating with constipation. The
animal generally dies from exhaustion after a period of sickness which may
last months or even years.

[Illustration: PLATE XXXIV. TUBERCULOSIS OF THE LUNGS OF CATTLE.]

[Illustration: PLATE XXXV. TUBERCULOSIS OF THE LIVER.]

[Illustration: PLATE XXXVI. TUBERCULOSIS OF LYMPH GLAND AND OF
OMENTUM (CAUL).]

[Illustration: PLATE XXXVII. FIG. 1.--TUBERCULOSIS OF SIRLOIN AND
PORTERHOUSE CUTS OF BEEF.
FIG. 2.--TUBERCULOSIS OF PLEURA OF A COW, SO-CALLED "PEARLY
DISEASE."]

[Illustration: PLATE XXXVIII. TUBERCULOSIS OF COW'S UDDER.]

* * * * *

TUBERCULOSIS.
DESCRIPTION OF PLATES.

PLATE XXXIV. Tuberculosis of the lungs of cattle. The upper figure
represents a large cheesy mass, surrounded by a capsule of connective
tissue, the whole embedded in healthy lung tissue. The lower figure
illustrates in section a mass of tubercles which have undergone cheesy
degeneration, and some of which are surrounded by dense connective tissue.

PLATE XXXV. Tuberculosis of the liver. A large portion of the lobe
represented in the plate has undergone tuberculous changes. Numerous
nodules are shown in various stages of the disease, the majority of which,
however, contain the yellowish, partly cheesy, partly gritty areas
characteristic of advanced tuberculous degeneration. This large mass
involves the surface of the liver, and also extends into the liver
substance.

PLATE XXXVI. Tuberculosis of lymph gland and of omentum (caul).

Fig. 1. A lymph gland from the region of the thorax behind or above the
esophagus, or gullet (posterior, or dorsal, mediastinum). The gland is
shown cut through and laid open. It is very much enlarged, and the
yellowish cheesy masses which represent tissue undergoing tuberculous
changes are well shown on the cut surface.

Fig. 2. Omentum, or caul, resting upon the paunch. The reddish nodules with
which the membrane is beset are tubercles, the product of the disease.

PLATE XXXVII. Fig. 1. Tuberculosis of the sirloin and p