232 THE DISEASES OF THE DOO. 



form of mange insect with which the canine surgeon has 

 to deal. It is one of the acaridse which burrows in the 

 superficial layer of the dermis, and clinically may he found 

 beneath the adherent scabs, which should be obtained 

 quite fresh from a part which had not been washed or 

 had dressings applied to it, preferably on a warm day or 

 when the animal is in a warm place. The common method 

 of obtaining the sarcoptes for examination is to place a 

 scab under surface uppermost on the human arm ; in a few 

 hours the acarus will desert the scab and penetrate the 

 living skin and thus give rise to a vesicle from which it 

 may be extracted on puncture with a needle. The mange 

 of dogs is occasionally communicated to man unintention- 

 ally and causes temporary irritation, but it is not severe 

 and disappears spontaneously or after simple dressings, 

 especially with Oleum Terebinthse. Symbiotes does not 

 apparently invade the skin of man, and therefore must be 

 searched for by exposing the fresh crusts on black paper 

 to the warmth of the sun's rays, when the acari leave the 

 crusts and collect in small clusters. It must be remem- 

 bered that the so-called " dry," " scabby," and " watery " 

 manges are merely stages of the same disorder in which 

 papules, pityriasis, or humid ezcema are present; more- 

 over, the term " red mange " must be accepted as one 

 applied indifferently to the sarcoptic or follicular disorder 

 or to simple non-parasitic eczema. The latter may be 

 present in parts of the skin of a mangy dog which have 

 not yet been invaded by the parasites. Treatment. — The 

 various methods which have been recommended by different 

 writers on this subject, and which prove practically 

 successful, amply prove that when treated in a proper 

 manner and with care mange may be cured with either of 

 a number of parasiticides. Attention must therefore be 

 paid as to how medicaments are applied as well as to 

 what special preparations are resorted to. This is a fact 

 to be noted in dealing with all parasitic disorders of the 

 skin where the cuticle and the scales formed on it protect 

 the parasites from direct contact of the agent used if it be 

 merely smeared over the surface. Therefore the animal 



