344 EPIZOOTIC LYMPHANGITIS 



or ten months. In experimental cases symptoms have 

 appeared after 32 days. 



§ 257. Symptoms. An infection takes place in wounds, 

 the first symptom usually appearing at the seat of a pre-exist- 

 ing wound. The lesions usually appear in the skin, but they 

 may occur on a mucous membrane. They consist of swelling 

 and suppuration of the lymph vessels and glands. These 

 break and discharge a thick, yellow pus, stained with blood. 

 Pearson states that the horses do not, as a rule, show any 

 general disturbance except in very advanced cases. Pallin 

 describes the opened sores as follows : 



' ' The buds, ulcers, or sores, by all of which names they 

 are known, are characterized by their bright red exuberant 

 granulations and their fungoid appearance, as well as by their 

 indurated base and well-defined edges ; the adjoining skin, 

 which is partially inverted, has a peculiar shiny appearance ; 

 an opening exists in the center of the bud, from which the pus, 

 at first creamy, and afterwards yellowish, oily, and curdled, is 

 continually discharging." 



These buds are quite different from those of glanders. 

 The lesions are commonest in the limbs. The most usual 

 location is on the fore-leg generally extending up along the 

 fore-arm to the brachial region and point of the shoulder. 



The sores vary in size from that of a pea to a hen's egg. 

 Pallin reports lesions on the mucous membranes in from 7 to 

 10 per cent of the cases. When these occur on the nasal 

 mucosae they are liable to be confounded with those of 

 glanders. 



Usually the general symptoms are not conspicuous. The 

 temperature remains normal an4 the appetite good. The 

 disease seems to thrive best on animals in good condition. 



Pearson describes its symptoms as follows: "The most 

 common manifestation consists in the presence of small, 

 chronic, discharging ulcers in the vicinity of the hock 

 joint of a thickened hind leg. In such a case, one may also 

 find small scars showing where ulcers have healed and there 



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