ile the subject is at
rest, but where muscular waste has occurred, the nature of the ailment
is at once recognized. Since the femoral nerve supplies the quadriceps
femoris muscles, it follows that when the psoic portion of this nerve
becomes diseased, the stifle loses its support, and in a unilateral
involvement when the subject attempts to walk on the affected member,
the stifle sinks down for want of support and the leg collapses unless
weight is caught up with the other leg. Often, following azoturia, a
bilateral affection is to be observed.

Treatment.--Horses may be restrained in the standing position, and in
the average instance, a twitch and hood are all the restraining
appliances necessary.

In cases where the disease is unilateral and atrophy is not of too long
standing, recovery is possible in vigorous subjects. All affections,
however, wherein degenerative changes involve the nerve trunk, whether
due to diffuse myositis or pressure from malignant tumors, will not
yield to treatment.

The same general plan of treatment is indicated that is described on
page 74 in the consideration of atrophy of the scapular muscles. It is
especially important to provide for the subject to be exercised when
there is atrophy of the quadriceps muscles following azoturia.

In addition to the foregoing, good results have attended the use of
intramuscular injections of oxygen. The technic of the operation
consists in preparing the area of skin which covers the atrophied
muscles as for any operation. The hair is clipped over five or six or
more circular areas of about an inch in diameter; the skin is cleansed
and then painted with tincture of iodin.

A long heavy sterile needle, which is connected with an oxygen tank by
means of six feet of rubber tubing, is thrust into the depths of the
affected muscles and the gas is gently introduced into the tissues. One
needs exercise extreme care that the gas enter slowly because great pain
is produced by the sudden injection of the oxygen. Likewise too much of
the gas must not be introduced at one place. When the oxygen is slowly
introduced it may be allowed to enter the tissues until the subject
gives evidence of experiencing considerable pain, or if the parts are
not particularly sensitive, a reasonable amount (enough to cause a mild
degree of diffuse inflammation) is introduced at each one of five or six
points. In large animals more points of injection may be used.

No infection or