6 STUDIES ON ACAEI. 



Benzine to 4 parts Hogs' lard). The various methorls of treatment given 

 above are selected from a large number which ha\e been employed by 

 various experimenters in attempting to cope with this complaint. 

 If not too far advanced the squamous variety of follicular mange is 

 more readily cured than the pustular; in treating tlie latter the pustules 

 should be opened and their contents pressed out before applying the 

 acaricidal solution. 



If only small areas are aifected they can be excised. Bru is of 

 opinion that if the diseased parts of the skin could be treated in such a 

 manner that the parasites were reached by the antiseptic or antiparasitic 

 substances used, most of those employed would be successful. He 

 points out that Cadeac has recommended a method in which 

 scarification is used for this purpose. All the pustules are emptied of 

 their contents by firm pressure, the papules and thicker parts of the 

 skin being pinched and scraped with a scalpel so as to scratch the skin, 

 the resulting wounds being treated with 95 % alcohol or diluted 

 tincture of iodine. A somewhat similar method is that advocated by 

 Hebrant and Antoine: — The parts affected by the follicular mange arc 

 rubbed with a rough brush until blood makes its appearance ; the surface 

 of the skin is then dried and painted with tincture of iodine. 



Heinrich Jakob records a large number of cases (117 in all) of 

 demodectic mange in dogs, observed in a year at the Clinical Station for 

 the Smaller Domestic Animals at Utrecht, Holland, whereas only six 

 cases of sarcoptic mange of the dog were seen in the same period. 

 According to Hall and Wigdor also Sarcoptes cams is much less 

 common in the United States than Demodex cam's. 



Demodectic mange of the Cat. — According to Schindelka, the folli- 

 cular mange of cats is very like that of the dog. It is most often 

 present on the head, afterwards spreading to the neck. The front legs 

 may also be affected. It is sometimes present at the same time as 

 Sarcoptic (Notoedric) mange, and may be either of the pustular or 

 squamous type. D. cati is sometimes present Avithout causing disease, 

 or associated with other diseases such as otitis (chancre) due to 

 Otodectes. 



Demodectic mange of the Horse. — Demodex equi is often present in 

 horses which are apparently free from disease. It seems clear, however, 

 that this species can cause a distinct pathogenic condition of the skin, 

 characterised either by pruritus, varying greatly in intensity, or by 

 definite lesions; these symptoms may occur together or separately. The 

 clinical effects are as follows : — The coat is poor, with the hair very 



