238 THE DISEASES OF THE DOG. 



the parasites occupy a position which prevents the imme- 

 diate access to them of the dressings which are resorted 

 to. Therefore the latter should contain some alkaline 

 substance, especially potash, as has been pointed out by 

 Hunting and Duguid, which acts on the epithelial tissue of 

 the skin and probably saponifies the fatty matter of the 

 sebaceous and hair-follicles. Hunting's dressing is olive 

 oil, fourteen parts, shaken up well, with one part of 

 creasote and then two parts of strong Liquor Potassse added, 

 to be applied every third or fourth day to all diseased 

 parts with a piece of rag, the dog having been washed a 

 few hours before each dressing. Zurn uses ointment of 

 benzine (1 — 4) ; Weiss inunction with essence of juniper ; 

 Zundel TJng. Argent. Nit., or TJng. Hydrarg. Verd. ; or 

 Balsam of Peru, oue part dissolved in alcohol, thirty parts 

 (Fleming). Mayhew recommends a mixture of equal 

 parts of nut oil, spirits of turpentine, and oil of tar, which 

 may be applied after washing the body carefully with a 

 strong solution of carbonate of potash. Hill prefers mer- 

 curial dressings. Eemove all hair of affected parts by 

 clipping or shaving ; Hunting insists on this on the grounds 

 that the presence of hair encourages the growth of the 

 parasites. Thus the treatment of follicular mange exactly 

 resembles that for true mange, but some dressings are found 

 most valuable for the former and others for the latter. Con- 

 stitutional treatment and disinfection must not be forgotten. 

 Sometimes several months' active treatment is required 

 for this disease, for agents which destroy the acari may 

 yet not suffice to render their ova incapable of being 

 hatched in due course and causing the disease to break 

 out again on parts where it has apparently been cured. 

 A bedding of red pine shavings is specially recommended 

 by Nunn in cases of mange ; it is preferable to pine saw- 

 dust, is cheap, easily procurable, does not get into sores 

 or the coat, and it does not cake into a hard mass. Care 

 should be taken to change it twice weekly, and to burn 

 the old bed. 



Skin Disease due to Leptus Autumnalis, the Haevest 

 Bug, has been described and figured by Friedberger 



