472 Veterinary Medicine. 



The symptoms in all such cases will var}' with the potency of 

 the factor and the susceptibility of the skin. Beside the common 

 symptoms the color and odor of the skin will often yield valu- 

 able diagnostic indications. There is the white of muriatic acid, 

 carbolic acid or zinc chloride, the black of silver salts or sulphuric 

 acid, the yellow of iodine, chromium compounds and nitric acid, 

 the well known odors of ammonia, iodine, chlorine, carbolic acid, 

 tar, essential oils, chloroform, ether, formaline, kerosene, mus- 

 tard, etc. 



Treatme?it is that of simple erythema after one has applied the 

 appropriate antidote to the particular irritant. For the alkalies 

 and carbolic acid use vinegar, for the acids oxide or carbonate of 

 magnesia, chalk or lime water, for iodine and chlorine weak al- 

 kaline solutions, for rhus, ammonia or other alkali, or potassium 

 permanganate, and for insect stings and animal venoms, alkalies 

 or permanganates. The caustic salts may demand milk, white 

 of Qgg, or some other albuminous solution. When no chemical 

 antidote is available, the first step is to wash off the offending 

 agent, and then treat the erythema. 



DERMATITIS. 



Under this head may be included a class of inflamations of the 

 skin, due mainly or entirely to external causes, not essentially 

 parasitic, and attended by distinct eruptions (papular, vesicular, 

 pu.stular, etc) . Many of these are but an advance beyond the simple 

 erythematous inflammation, and coincide with it, the one condition 

 being present at one part of the di.seased area, and the more ad- 

 vanced and severe lesions at another part. Bearing in mind the 

 frequency of this connection, it will be unnecessary to dwell at 

 length on this class of affections. 



Dermatitis Traumatica. Dermatitis from Mechanical 

 Injury. Besides the veritant factors already named as causing 

 traumatic erythema, we must here recognize contusions, over- 

 reaching, treads, interfering, brui-sing and chafing by harness, 

 o-irths, circingles, hobbles, ropes, traces, twists, and blows with 

 whip, club, chain or rope. Here the .source of injury must be re- 



