558 DISEASES OF THE HORSE. 
utensils, harness, bandages, insects, etc. Solipeds are mostly sus- 
ceptible, but cattle may also be infected. 
Symptoms.—The inflammation of the lymph vessels is usually first 
observed on the extremities, especially on one or both hind legs; it 
may also appear on the forelegs, shoulder, or neck, and more rarely 
on the rump, udder, and scrotum. The lesions, as a rule, develop in 
the tissue adjacent to the place of inoculation. In the early stages of 
the disease the lymph vessels appear very hard and thickened, and 
along their course hard nodules develop, ranging in size from a pea 
to a hen’s egg. Later these nodules soften, burst spontaneously, and 
discharge a thick, yellowish pus. The surface of the resulting ulcers 
or abscess cavities soon fills up with exuberant granulations which 
protrude beyond the surface of the skin, giving it a fungoid appear- 
ance. The affected extremities are considerably enlarged, similar 
to cases of simple lymphangitis. In rare cases the mucous membrane 
of the nostrils may also become affected, showing yellowish flat ele- 
vations and ulcerations, and these may extend by metastasis to inter- 
nal organs. In cases in which the mucous membrane is affected, the 
submaxillary lymph gland may also become enlarged and suppurate. 
The constitutional symptoms accompanying this disease are not 
very marked and may be altogether absent. , There is usually only a 
very slight fever, which seldom runs over 102° F. The appetite is 
not impaired except in the advanced cases. 
Lesions.—The anatomical changes are most marked in the skin and 
the subcutaneous tissues. They may become 2 to 3 inches thick and 
indurated as the result of fibrous-tissue formation, owing to the in- 
flammation present. On the baconlike cut surface suppurative areas 
and granulating sores may be noticed of various sizes, also enlarged 
lymph vessels filled with clotted lymph mixed with pus. The neigh- 
boring lymph glands are usually enlarged and frequently contain 
suppurating foci. Rarely the internal organs may show metastatic 
abscesses. 
Diagnosis —The diagnosis is based on the characteristic appear- 
ance of the ulcerations, which show exuberant granulation of a bright 
red color, inverted edges, and a thick, creamy, glutinous discharge. 
These manifestations differentiate the disease from glanders, in which 
the ulcers are craterlike, do contain exuberant granulations, and the 
discharge is of a viscous, oily character. The submaxillary and 
other nodes as well as the corded lymphatics in glanders are more 
firmly attached to the adjacent tissues, and are therefore less mov- 
able. In some chronic cases of sporotrichosis, however, the lesions 
may closely resemble those of farcy, and in these cases the micro- 
scopical examination of the pus will disclose the nature of the affec- 
tion. In the pus the causative organism can be easily seen in the un- 
stained specimen, and is recognized by its size, shape, and highly re- 
