on of the heart muscle. This
is shown by a very weak and rapid pulse, great prostration, some filling
of the lungs. This complication nearly always terminates in death. Other
complications which may be mentioned are inflammation of the kidneys,
blood poisoning, congestion of the brain, and inflammation of the
tendinous sheaths and the tendons of the legs.

_Diagnosis._--As fever is the first symptom of infectious pneumonia, it
is useful during an outbreak of this disease to make daily temperature
measurements of the exposed horses, so that the first indication of
disease may be discovered and the horse removed from contact with those
that are sound.

_Prognosis._--The mortality in this disease may be as high as 25 per
cent, but it is usually not more than 10 per cent. If there is a special
tendency to complications of some sort, the mortality is increased.

_Alterations._--At the time of death from infectious pneumonia we
frequently find septic changes and the evidences of putrefaction. The
solidification of the lung tissue is found irregular in shape and high
around the root of the lungs and the large bronchi, and is generally
covered by sound lung tissue. The anterior lobes of the lungs are
usually entirely affected. The diseased portion appears of a
gray-yellowish color, somewhat watery, and tears readily. Matter is
found in the air tubes which form gutters through the jellylike mass of
the diseased lung. Abscesses from the size of a nut to larger masses may
be found throughout the lungs. The blood is dark in color, fluid, or
only clotted into soft, jellylike masses. Masses of gangrenous or
dead-black tissue may be present.

_Treatment._--Bleeding is not to be used, because it would only still
further weaken an already enfeebled animal; antimony or the alterants
would increase the depression of a too-depraved constitution. There is
in this disease no acute congestion of a particular organ to draw off by
depletive measures, nor any violent blood current to be retarded, for
fear of hypernutrition of any special part.

Revulsives do good, as they excite the nervous system and awaken the
torpor of the weakened blood vessels, which aid in the reestablishment
of the functions. As in other diseases, mustard poultices may be applied
over the belly and sides of the chest, but caution must be used in the
employment of blisters, as ugly ulcers may result from their action on a
tissue of weakened vitality. Setons are danger