throughout the
whole course of the trouble are less marked and less clearly defined.

The symptoms may develop slowly or rapidly. If slowly, there is fever
and the animal gives a rare cough which resembles that of a heavy horse
affected with a slight chronic bronchitis; it becomes somewhat dejected
and dull, at times somnolent, and has a diminished appetite. This
condition lasts for several days, or the disease may begin with high
fever, and the symptoms described below are severe and develop in rapid
sequence. The respiration increases to 24, 30, or 36 to the minute, and
a small, running, soft pulse attains a rhythm of 50, 70, or even more
beats in the sixty seconds. The heart, however, contrary to the
debilitated condition of the pulse, is found beating violently and
tumultuously, as it does in anthrax and septic intoxication. The mucous
membranes of the eyes and mouth and of the genital organs are found
somewhat edematous, and they rapidly assume a dirty, saffron color, at
times approaching an ocher, but distinguishable from the similar
coloration in influenza by the want of the luster belonging to the
latter and by the muddy, dull tint, which is characteristic throughout
the disease.

Suddenly, without the preliminary rales which precede grave lesions of
the lungs in other diseases, the blowing murmur of pneumonia is heard
over a variable area of the chest, usually, however, much more
distinctly over the trachea at the base of the neck and directly behind
the shoulder on each side of the chest. In some cases the evidence of
lung lesion can be detected only over the trachea. The lesions of the
lungs may be scattered throughout both lungs, involving numerous small
areas, or they may be confined to and more or less fully occupy one or
two lobes. Occasionally there is a general involvement of both lungs.
The body temperature has now reached 104 deg. or 105 deg. F., or in extreme
cases even a degree higher. The debility of the animal is great without
the stupefaction or evidence of cerebral trouble, which is constant with
such grave constitutional phenomena in influenza or severe pneumonia.
The animal is subject to occasional chills, and staggers in its gait.
The yellow coloration of the visible mucous membrane is rendered pale by
infiltration of the liquid of the blood into the tissues; the pulse may
become so soft as to be almost imperceptible, the heart movement and
sounds being at the same time exaggerated. The anim