SKIX DISEASES. 345 



in^ evidently a disease of the bulb which produces the hair, inas- 

 much as the colorin;^ matter of the hair itself is altered. It first 

 shows itself almost invariably at tlie elbows and inside the arms, 

 then on the front and inside of the thighs, next on the buttocks, 

 and finally on the back, which is attacked when the disease has ex- 

 isted for some weeks or months. The general health does not ap- 

 pear to suffer, and the skin is not at all scabbed, except from the 

 effects of the scratching, which is very frequent, but not so severe 

 as in the virulent or foul mange. Red mange is probably conta- 

 gious, but it is by no means a settled question, as it will uften be 

 seen in single dogs which are in the same kennel witt otiicrs free 

 from it entirely. Dogs highly fed, and allowed to n'e before the 

 fire, are most subject to it, while the poor half -starved cur becomes 

 aflfected with the foul or virulent forms. The treatment is to 

 lower the diet; give aperients (.12) to (13). Following up these 

 with the addition of green vegetables to the food, at the same time 

 asing one or other of the following applications every other day. 

 In obstinate cases arsenic may be given internally. 



Dressing for red mange : — Green iodide of mercury, 1^ drachm; 

 spirits of turpentine, 2 drachms ; larJ, 1^ oui;ice. Rub a very little 

 of this well into the roots of the hair eycry other day. 



Or, use carbolic acid, 1 part ; water, 30 parts. Use as a wash. 



Canker of the ear has elsewhere been alluded to under the dis- 

 eases of that organ. 



Irritative inflammation of the skin is produced by fleas, lice, and 

 ticks, which are readily discovered by examining the roots of the 

 hair. Dog-fleas resemble those of the human subject. The lice 

 infesting the animal are much larger, but otherwise similar in ap- 

 pearance. Dog-ticks may easily be recognized by their spider-like 

 forms, and bloated bodies, the claws adhering firmly to the skin, 

 so that they are with some difficulty removed. These last are of 

 all sizes, from that of an R.voragc pin's head to the dimensions of a 

 ladybird. They suck a grcit quantity of blood when numerous, 

 and impoverish the animal to a terrible extent, partly by the drain 

 on the system, and partly by tjje constant iiritation which they 

 produce. The remedies are as follows : — 



