but one quarter,
more rarely two, these being usually the hind quarters. The larger milk
ducts contain yellowish, cheesy particles, in which are many tubercle
bacilli. Later larger nodules can be felt within the udder, which undergo
the various changes to which tubercles are subject. The udder may grow very
hard to the touch and become very large, weighing in some cases up to 40
pounds. The milk, at first normal, becomes thin and watery after a month or
so, and is mixed with flakes and tubercle bacilli.

As regards the frequency of the tuberculous processes in the different
organs, the following carefully compiled statistics of the disease in
Bavaria and Baden may serve as a guide:

Bavaria: Per cent.
Tuberculosis of lungs and serous membranes 41
Tuberculosis of lungs alone 33
Tuberculosis of serous membranes alone (pearly disease) 17
Tuberculosis of other organs 8

Baden:
Tuberculosis of lungs alone 21
Tuberculosis of serous membranes alone 28
Both combined 39
Generalized tuberculosis 9
Tuberculosis of the sexual organs alone 3

_Symptoms._--The beginning of the disease usually passes unnoticed,
inasmuch as it is very slow and insidious and rarely accompanied with
fever. When the lungs are involved a dull, short cough is noticed, which
may later on become prolonged, convulsive, and very troublesome to the
animal. The cough is more frequent in the morning after movement and
drinking. The breathing varies. Only when much of the lung tissue is
diseased is it labored and accompanied with active movements of the chest
and nostrils. Discharge from the nose is rare or absent. At times, however,
when the tubercles have broken down and cavities containing cheesy masses
have formed in the lung tissue, or when the air tubes have become filled
with cheesy and mucous masses, coughing will dislodge them and cause their
discharge. In advanced stages the breath may have a disagreeable odor.
Pressure on the chest wall may give rise to pain.

The general effect on the body is at first slight. In fact, animals may
remain in good flesh for a considerable time. Invariably as the disease
progresses loss of flesh and appetite and