Erythema Caloricum : Solar Erythema. 471 



and discharge. Meanwhile the subcutaneous connective tissue 

 is infiltrated and gravitates toward the lowest parts, causing ex- 

 tensive submaxillary swellings and stocking of the limbs. In its 

 worst forms it may go on to necrosis and sloughing, but more 

 commonly the affected part becomes raw, excoriated, cracked 

 and fissured. Sometimes the pituita or even the buccal mem- 

 brane becomes involved, with muco-purulent discharge. In other 

 cases the absorption of septic products causes inflammation and 

 swelling of the submaxillary or pharyngeal lymph glands. Un- 

 der favorable conditions, the secretions dry, the sores heal and the 

 exudate is in great part absorbed, but there usually remains some 

 thickening of the affected parts and a diminished vitality of the 

 skin, which renders it morbidly sensitive to sources of irritation. 



Severe cases might be mistaken for petechial fever, but there 

 is much more pruritus, and there is an absence of the petechise, on 

 the mucosae, and of a tendency to the extension of the disease 

 far beyond the patches of white. 



Treatment. Prevention. This malady should be warded off 

 by breeding or selecting for warm, sunny climes, animals of a 

 solid color, and discarding all with white patches. Animals 

 bred in a cooler climate should not be suddenly transferred to 

 a hot one. When the animal with white face or feet is found 

 in the hot sunny climate, it should be devoted as far as pos- 

 sible to work in the shade (indoors or in mines), or its white 

 patches should be protected against the full unmitigated rays 

 of the sun, and the hot winds. Sun shades are useful or in 

 their absence leafy branches fastened to the bridle so as to 

 protect the face. It is further important to avoid the friction 

 of harness on the susceptible parts, or wetting of them when in 

 the full glare of sunshine. Another obvious precaution is to 

 keep the white patches well covered with lamp black. 



When attacked the animal must be placed under cover and 

 the eruption treated with cooling astringents, constant irrigation 

 with cool water, or lotions with acetate of lead, tannic acid, 

 alum or sulphate of zinc. When the skin is dry and rigid it 

 may be treated with vaseline, alone or with zinc oxide, lamp 

 black or any one of the astringents above named. Open sores 

 may be- treated like ordinary wounds, tense engorgements may 



