MANGE. 189 



in a line straight before it ; and from the difiB.culty it evidently 

 experiences in turning round, even upon a smooth glass slide, 

 I am of opinion that the creature, when attached to the skin 

 of the horse, can only travel but in one direction, and that is 

 straight forward.* 



PATHOGUfOMOHio Stmptoms. — The pathognomonic proofs 

 of Mange are of a very direct nature. The existence of the 

 insect upon the skin will at once afford certain and conclusive 

 evidence of the fact of the existence of Mange. It can be 

 readily determiaed. To do so, comb a quantity of the scurf 

 from the skin upon a piece of black cotton having a smooth 

 surface, and by spreading the scurf upon it, and observing 

 it closely, any one having a good vision may (if the insect 

 be present) readily detect its movements with the naked eye. 

 A good common pocket lens, however, will aid the observer 

 materially. 



Those parts of the skia covered with downy hair and fine 

 scurf intermixed, are the best localities to discover the insect. 

 Cold renders the insect torpid: warmth quickens its movements 

 considerably. 



TREATMENT. — In overy case of Mange the patient should be 

 treated both topically and constitutionally. The best remedies 

 to apply externally are Sulphur, Creasote, Mercurial Oiatment, 

 Hog's Lard, and Olive Oil. 



Sulphw, in one or more of its various forms, has been a 

 specific remedy against Itch of the human being and Mange 

 of the horse from time immemorial. I generally use Sulphur, 



* On many oocasiona, when observing the movements of the Mange 

 Insect, I have witnessed the slow manner vrith which it turns ; the long 

 hairs attached to the hind limbs will prevent its turning upon a rough 

 irregular surface, such as the surface of the skin, particularly when the latter 

 is covered with hair. 



