I 

 770 DISEASES OF ACCESSORY ORGANS AND STRUCTURES. 



the presence of pediciili or other organisms, the destruction of 

 these will generally be followed by subsidence of the itchings. 

 Usually, however, in all typical cases of this disease, it is the 

 alleviation or removal of the distinctive symptom, the itching, 

 which chiefly occupies our attention. This will be found, 

 particularly at first, to be more easily accomplished through 

 the emj)loyment of local soothing and anodyne agents than by 

 special stimulants. For this purpose there is nothing which 

 recommends itself more to our favourable consideration on 

 many grounds than an alkaline solution, with a little opium or 

 digitalis tincture or solution; or a mixture of two parts of 

 glycerine, one of medicinal prussic acid, and thirteen of 

 water. 



With these local applications a little laxative medicine, 

 followed by the daily use of salines in the water and good 

 wholesome diet, is to be recommended. 



When the more active symptoms of irritation and local 

 congestion from rubbing have somewhat subsided, but a con- 

 siderable amount of itching continues, if cooling and anodyne 

 applications do not seem to induce or hasten the disappearance 

 of the disturbing local irritation, some of the tarry compounds 

 may be used. The employment of these, however, always 

 requires a certain amount of care, in order that their stimulant 

 action be not carried too far ; and after two or three applica- 

 tions they ought always to be washed off" and renewed if 

 needed. When the animals affected are weak, ,or in chronic 

 cases, the internal use of iron and acid, or of arsenic with 

 bicarbonate of potash, or of compounds of iodine, as Donovan's 

 solution, I have found to be productive of good results. 



Class IV. Diseases of Accessory Organs and Struc- 

 tures OF THE Skin. 



There is no doubt that in various diseases where the entire 

 structure of the skin is invaded, all parts and structures 

 essential and accessory may be involved ; here, however, the 

 abnormal conditions which chiefly engage our attention arc 

 such as are primarily or in an especial manner connected 

 with the skin gland-structures, and the hairs and hair- 

 follicles. 



