Dermatitis. 483 



moved, by attention to shoeing, harness, etc., and the lesions treat- 

 ed according to their gravity as simple wounds. 



Dermatitis Venenata : Dermatitis Calorica. These, like 

 the corresponding erythema, come from contact with irritant 

 plants or animals or their products, from excessive heat or cold, 

 and may show any grade of eruption or even gangrene and slough- 

 ing. Apart from the washing off of the irritant or venomous 

 matter and the application of alkalies or permanganates in the case 

 of the latter, these must be treated like ordinary sores. In burns, 

 especial value attaches to solutions of sodium bicarbonate, and 

 preparations that will exclude the air. Vesicles may be emptied 

 by puncture and the part covered with cotton soaked in carbolated 

 sweet oil and lime water, or carron oil (linseed oil and lime 

 water) may be freely applied, or a resorcin solution (2 : 100 water) , 

 or a thick varnish of linseed oil and litharge, equal parts, with 

 5 per cent, of salicylic acid, melted and painted over the surface. 

 A layer of surgeon's cotton covered by a rubber bandage where 

 admissible, will complete the dressing. In the process of healing, 

 skin grafting may be required. Thin slices of cuticle are placed 

 in the center of the granulating surface, or at intervals and care- 

 fully bound in place. 



When a part has been frozen the usual method is to recover 

 circulation slowly by rubbing with cold water or snow. The 

 parts are then treated by astringent and antiseptic dressings. If 

 the skin sloughs use antiseptics until it separates, and then treat 

 like an ordinary sore. 



Chillblains may be treated with a mixture of sweet oil, 5 ozs. , 

 oil of turpentine J^ oz. , Aqua Ammonia Yz oz. , oil of peppermint 

 I dr., or powdered camphor 10 grs., Peru balsam 20 drops, lin- 

 seed oil 2 ozs. Nourishing food and a course of iron should be 

 given. 



Dermatitis Medicamentosa. Medicines given by the mouth 

 sometimes cause inveterate skin eruptions. Among these are ar- 

 senic, belladonna, bromides, iodides, mercurials, salicylates, tan- 

 sy, turpentine, tar, and the carminative seeds ^ and oils. The 

 latter are chargeable with many eruptions in live stock fed on 

 patent foods. In cattle treated with iodides for actinomycosis, 

 an universal eruption and desquamation is a common condition. ■ 



