422 INFLAMMATIONS. 



of the scratching, wliicli is very frequent, but not so severe as in 

 the virulent or foul mange. It appears most probable that red 

 mange is contagious, but it is by no means a settled question, as it 

 will often be seen in single dogs which are in the same kennel 

 with others free from it entirely. Of its exact nature I know 

 nothing, beyond the theoretical belief, founded upon analogy, that 

 the disease is in the blood, and is not caused by any parasite. 

 Dogs which are highly fed, and which are allowed to lie before 

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

 becomes affected with the foul or virulent forms. The treaf merit 

 consists in lowering thec|iet, giving aperients (12) or (13) ; follow- 

 ing these up with the addition of green vegetables to the food, and 

 at the same time using one or other of the following applications 

 every other day. In obstinate cases arsenic may be given inter- 

 nally (see page 418). 



Dressing for red mange : — 



Green iodide of mercury, \\ dracLm. 

 Spirit of turpentine, 2 drachms. 

 Lard, 1^ ounce. 



Mix, rub a very little of this well into the roots of the hair every other day. 



Or, 



Carbolic acid, 1 part. 

 Water, 30 parts. 



Use as a wash. 



Canker of the ear has been alluded to under the disease of that 

 organ at page 396. 



