420 INFLAMMATIONS. 



that it is caused by an insect of the acarus tribe, which has been 

 detected by the microscope in many cases, but which by some 

 people is maintained to be an accidental effect, and not a cause of 

 mange. However this may be, it is found that remedies which 

 are destructive to insect life, are by far the most efl&cacious, such as 

 hellebore, sulphur, corrosive sublimate, tobacco, &c. The second 

 kind of virulent mange is more rare than that described above, 

 and still more difficult of cure, the vegetable parasite being less 

 easily destroyed than the insect. This parasite is supposed to be 

 of the nature of mould or fungus, which we all know is most ob- 

 stinately tenacious of life, and is reproduced again and again in 

 any liquid where it has once developed its germs. In outward 

 appearance this variety of mange differs very little from the insect- 

 produced form, but it may be known by its generally attacking 

 young puppies, while the other appears at all ages, but chiefly in 

 the adult animal. The hair falls ofi" in both, but there is more 

 scab in the insect mange, probably from the fact, that it does not 

 produce such violent itching, and therefore the scratching is not 

 so incessant. The treatment is nearly the same in both cases, being 

 chiefly by external remedies, though alteratives, stomachics, and 

 tonics, are often required from the loss of health which generally 

 accompanies the disease. In all cases, therefore, it is necessary to 

 attend to this, giving generally a mild aperient first, such as (12) 

 or (13), and subsequently (2) and (3) combined together, or (1) 

 and (59), according to circumstances. At the same time one of 

 the following applications may be tried externally, with the greatest 

 care that the dog does not lick them off, as they are highly poi- 



