mplication of influenza. It is ushered
in by chills, elevation of the temperature; the pulse becomes rapid,
thready, and imperceptible. The heart murmurs become indistinct or can
not be heard. A venous pulse is seen on the line of the jugular veins
along the neck. Respiration becomes more difficult and rapid. If the
animal is moved the symptoms become more marked or it may drop suddenly
dead from heart failure.

_Peritonitis_, or inflammation of the membranes lining the belly and
covering the organs contained in it, sometimes takes place. The general
symptoms are similar to those of a commencing pericarditis. The local
symptoms are those of pain, especially to pressure on side of the flanks
and belly, distention of the latter, and sometimes the formation of
flatus, or gas, and constipation.

Other occasional complications are nephritis, hepatitis, inflammation of
the flexor tendons and rupture of them, and abscesses.

_Diagnosis._--The diagnosis of influenza is based upon continued fever,
with great depression and symptoms of stupor and coma; the rapidly
developing, dark-saffron, ocher, yellowish discoloration of the mucous
membranes, swelling of the legs and soft tissues of the genitals. When
these symptoms have become manifested the diagnosis of a local
complication is based upon the same symptoms that are produced in the
local diseases from other causes, but in influenza the local symptoms
are frequently masked or even entirely hidden by the intense stupor of
the animal, which renders it insensible to pain. The evidence of colic
and congestion, which is followed by diarrhea, indicates enteritis. The
rapid breathing or difficulty of respiration points to a complication of
the lungs, but, as we have seen in the study of the symptoms, the local
evidences of lung lesions are frequently hidden. Again, we have seen
that inflammation of the feet, or founder, complicating influenza is
frequently not shown on account of the insensibility to pain on the part
of the animal, which indicates the importance of running the hand daily
over the hoofs to detect any sudden elevation of temperature on their
surface.

The diagnosis of brain trouble is based upon the excessive violence
which occurs in the course of the disease, for during the intervening
period or coma there is no means of determining that it is due to this
complication. Severe cases of influenza may simulate anthrax in the
horse. In both we have stupor, the intense c