able cases of this description have been encountered in
practice.

Unfortunately, we often find a rapid destruction of the tissues of the
lungs, and speedy dissolution. In other instances, the general symptoms
of hectic, or consumption, attend lingering cases, in which the
temperature of the body becomes low, and the animal has a dainty
appetite, or refuses all nourishment. It has a discharge from the eyes,
and a fetid, sanious discharge from the nose. Not infrequently, it
coughs up disorganized lung-tissue and putrid pus. Great prostration,
and, indeed, typhus symptoms, set in. There is a fetid diarrhoea, and
the animal sinks in the most emaciated state, often dying from
suffocation, in consequence of the complete destruction of the
respiratory structures.

_Post mortem_ appearances.--In acute cases, the cadaverous lesions
chiefly consist in abundant false membranes in the trachea, or windpipe,
and closure of the bronchial tubes by plastic lymph. The air-vesicles
are completely plugged by this material, and very interesting specimens
may be obtained by careful dissection, in the shape of casts of the
bronchial tubes and air-vesicles, clustered together like bunches of
grapes. On slicing the lungs in these cases, hepatization is observed,
presenting a very peculiar appearance, which is, in a great measure, due
to the arrangement of the lung-tissue in cattle. The pulmonary lobules
are of a deep-red or brown color, perfectly consolidated, and
intersected or separated, one from the other, by lighter streaks of
yellowish-red lymph, occupying the interlobular, areolar tissue. In the
more chronic cases, the diseased lobes and lobules are found partly
separated from the more healthy structures.

This occurs from gangrene, and putrefactive changes, or in some
instances, from the ulcerative process, so constantly observed in the
segregation of dead from living tissues. Abscesses are not infrequently
found in different parts of the lungs. Sometimes circumscribed, at
others connected with bronchial tubes, and not infrequently
communicating with the pleural cavity. True empyema is not often seen;
but, at all times, the adhesions between the costal and visceral pleura
are extensive, and there is much effusion in the chest. In dressed
carcasses of cows that have been slaughtered from pleuro-pneumonia, even
though the disease has not been far advanced, it will be found that the
butcher has carefully scraped the serous membrane off