infection and when such injuries are near lymph glands, even though the
degree of infection be slight, more or less disturbance of function of
the muscles in the vicinity of such glands occurs and lameness follows.

The prescapular, axillary and cubital lymph glands when in a state of
inflammation, cause lameness of the front leg, and the superficial
inguinal and deep inguinal lymph glands not infrequently become involved
also. Because of the location of these lymph glands, they are subject to
comparatively frequent injury and inflammation, causing lameness more
often than other lymph-gland-affections.

Small puncture wounds in the region of the elbow are often met with.
These may be inflicted when horses lie down upon sharp stumps of
vegetation or shoe-calk injuries may be the means of introducing
contagium, and an infectious inflammation results. Abscess formation,
the result of strangles or other infection in the prescapular glands,
may be observed at times. Following castration, the inguinal lymph
glands may become involved in an infectious inflammation and locomotion
is impeded to a marked degree. Horses running at pasture sometimes
become injured by trampling upon pieces of wood, causing one end of
these or of various implements to become embedded in the soft earth and
the other end to enter at the inguinal region and even penetrate the
tissues to and through the skin and fascia just below the perineal
region.

Nail punctures resulting in infection frequently cause an infectious
lymphangitis and a marked and painful swelling of the legs supervenes.

[Illustration: Fig. 61--Chronic lymphangitis. Showing hypertrophy of the
left hind leg, due to repeated inflammation.]

Symptomatology.--Lameness, mixed or swinging-leg, signalizes the
presence of acute lymphangitis. There is always more or less swelling
present and manipulation of the affected parts gives pain to the
subject. Depending upon the character of the infection and its extent,
there is presented a varying degree of constitutional disturbance. There
may be a rise in temperature of from two to five degrees, and in such
instances there is an accelerated pulse. Where much intoxication is
present, anorexia and dipsosis are to be noticed.

Swelling may increase gradually and in time discharge of pus may take
place spontaneously without drainage being provided for, if the
character of the infection does not cause early death. In these cases
lameness is prono