MANGE. 189 



in a line straight before it ; and from the difficulty 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 the direction, and that 

 is straight forwards.* 



Pathogi^omonic Symptoms. — The pathognomonic proofs 

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

 insect upon the shin will at once aford certain and conclusive 

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

 readily determined. 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 obser\dng 

 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 skin covered with downy hair 'and fine 

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

 Cold renders the insect torpid ; warmth quickens its move- 

 ments considerably. 



Teeatme]s^t. — In every case of Mange the patient should be 

 treated both topically and constitutionally. The best remedies 

 to apply externally are Sulphur, Creasote, Mercurial Ointment, 

 Hog's Lard, and Olive Oil. 



SxJLPHUE, 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 occasions, when observing the movements of the Mange Insect, I 

 have witnessed the slow manner with which it turns ; the long hairs attached to 

 the hind limbs must prevent its turning upon a rough irregiJar surface, such as 

 the smface of the skin, particularly when the latter is covered with hair. 



