EPIZOOTIC LYMPHANGITIS. 491 



qiioiitly observed in tlie liver of the rabbit, or of a yeast cell, sac- 

 chroinyc.es. 



SYMPTOMS, COURSE, PERIOD OF INCUBATION AND 

 MORTALITY. — The symptoms of this disease are extremely like 

 those of farcy, from which, however, it can be clearly distinguished 

 by the microscopical examination of the organisms, and by the 

 fact that mallein produces no reaction in horses which are suffer- 

 ing from it. 



" This disease develops from wounds, after a period of incuba- 

 tion of about three months. Multiple abscesses accompanied by 

 lymphangitis appear round the affected part in and immediately 

 under the skin. These abscesses form nodular new-growths which 

 are seen later on in the lymph glands, connective tissue of the 

 muscles, bones, and even in the conjunctiva, and which undergo a 

 slow process of suppuration. In th« skin they subsequently change 

 into fungoid ulcers. The mortality amounts to about 10 per cent. 

 With energetic treatment, a cure takes place in from one to seven 

 months " (Friedherger and Frohner). A well-marked feature of ■ 

 this disease is the presence of prominent and hard lymphatic 

 vessels. 



The following symptoms were observed .in cases of this disease : — 

 The patient (a mule) presented a chain of abscesses connected 

 hf corded lymphatics starting from the shoulder and running up 

 the neck following, the course of the jugular vein. This animal 

 was destroyed. Local lesions only, all internal organs presented 

 a perfectly healthy appearance. 



Mule. Fluctuating swellings were observed running up the 

 inside of the arm. Destroyed. Local lesions, internal organs 

 healthy. 



Mule. This animal presented several small fluctuating tumours 

 on the right side of the chest, over the ribs, and a thick corded 

 lymphatic proceeded from the root of the neck and ran down 

 between the fore legs, from before backwards along the under 

 surface of the abdominal wall. Destroyed. Local lesions, internal 

 organs presented a perfectly healthy appearance. 



Four horses and nine mules were found, presenting small 

 tumours and open wounds on different parts of the body, associated 

 in some instances with swellings varying in size from a small walnut 

 to that of a hen's egg, from which oordted and beaded lymphatic 

 vessels issued. Whilst in others, tumours were observed which on 

 -manipulation were found hard and fluctuating according to the 

 stage which they had attained. In the majority of cases the 

 lymphangitis had made its appearance on a level of a pre-existing 

 wound of little importance, abrasion of the skin, or harness gall. 



