IGO CONTAGIOUS DISEASES OF DOMESTICATED ANIMALS. 



laror nervous disorder, craiups, paralysis, wryneck, epilepsy, turning' in 

 a cirele, coma, blindness, in others disease of the testicles, or udder, of 

 the bones, joints, and skin. 



The affection may prove fatal in less than three months, or it may last 

 fjr an ordinary lifetime. It may induce other diseases of the organs 

 in which it is located, and thus greatly complicate the sj^mptoras or 

 hasten a fatal result. 



It follows that the disease is not always easy to diagnose. Yet its 

 symptomatology is quite as advanced as that of many other diseases, 

 and with the recent demonstration of its germ — hnciUus tuberculosis — 

 it is sufficient for the purposes of veterinary sanitary police. 



The i)athological anatomy of tuberculosis is more perfect. The lesions 

 most constantly met in the cadaver are the neoplasms on the pleurae 

 and peritoneum. These vary in size from a millet seed to a pea ; they 

 are single or united in bunches (grapes), pedunculated, polypoid, or 

 warty, red, flesh-colored or brownish yellow, and of most varied con- 

 sistency. Very often the center of the soft nodosity is deep red, while 

 that of the har.l one is yellowish and caseated or of the consistency 

 of mortar. According to Virchow they appear first as little nodosities 

 or pearls in groups projecting slightly from the surface of the serous 

 membranes ; later they become pedunculated, remaining connected by 

 vascular bands of connective tissue: still later earthy salts are deposited 

 in them, and finally they soften, undergoing fatty degeneration, and be- 

 come like a thick mortar. 



Changes in the lymphatic glands of the head, neck, chest, abdomen, 

 &c., are also present in all but the most exceptional cases. These are 

 swollen, and of a dull, yellowish color, impregnated with juice or pig- 

 mented. They »how haemorrhages as large as a pin's head, irregular 

 enlargements, and indurations. On section the snrtVice shows numerous 

 infiltrated points of the size of a millet seed to a pea, of a grayish yel- 

 low or whitish color, and the consistency of cheese or mortar. Larger 

 centers of irregular sliape, but the same characters, are also met with. 



The lungs in most cases present similar lesions in nodules and no- 

 dosities in all stages from the simple hemorrhagic point to the caseous 

 or calcareous mass, also connective tissue neoplasm, which obliterate 

 the pubnonary lobules and attain considerable size, and finally caseous 

 masses in the midst of lung tissue, otherwise unaltered. Sometimes the 

 nodosities of the pleura covering the ribs adhere to those on the lungs, 

 and they miy b3ci>me continuous into the lung tissue for an indefinite 

 distance. 



The softened nodosities may open into the pleural sac with fatal effect, 

 or into the bronchia, causing a grumous discharge from the nose and 

 mouth, and when empty they form cavities — vomicae. 



The nodules are common on the mucous membranes of the trachea, 

 larynx, pharynx, and gullet, and in the submucous tissue of these parts, 

 .and softening and discharging they form funnel-shaped ulcers, which 



