5o8 Veterinary Medicine. 



affected patches, have some thickening and folding of the skin, 

 which is usually dry, scaly and largely divested of hair. Itch- 

 ing is moderate only, and the hairs are shed less rapidly than in 

 the encrusted forms. 



Treatment. When there has been a fresh irruption it may be 

 requisite to. treat chronic eczema, for a time, after the manner 

 of the acute, so as to avoid any tendency to aggravation of the al- 

 ready existing irritation. A careful regulation of the diet is as 

 essential in the chronic forms as in the acute and in the inveterate 

 types, especially those of a squamous character, alteratives like ar- 

 senic are often of value. In the acute stage or during a recrudes- 

 cence the mild dusting powders (starch, zinc oxide, lycopodium, 

 magnesia bicarbonate, bismuth oxide, thiol) may be applied, or 

 bland unguents (zinc, benzoated zinc, lead, vaseline, glycerine, 

 spermaceti and almond oil, paraffin, wax), or sedative lotions 

 (lead, opiate, thymol, thiol, carbolic acid). 



In the more advanced and moist forms astringents and stimu- 

 lants may be adopted : silver nitrate (2 : 100), applied with soft 

 cotton, mercuric chloride (i : 1000), or black wash (calomel i : 

 lime water 60) care being taken to use a close wire muzzle to pre- 

 vent licking. Copper sulphate (i : 100) is at times useful, and 

 boric acid, and tannin may be tried. Iodoform i part and tannic 

 acid 5 has a good effect in many cases. 



For the dry and scaly forms, and indeed for many of the 

 others, as well, the more stimulating ointments and liniments 

 are called for. Cadeac recommends oil of cade, tinctures of can- 

 tharides, or a tar liniment made with alcohol, as a supersedent to 

 produce an active inflammation and displace the unhealthy ecze- 

 matous one. The agent is rubbed upon the skin and the resulting 

 scabs are left for a week when it is washed off with tepid water 

 and the skin is found healthy or greatly improved. As a rule a 

 second dressing of the tar is then applied. Miiller strongly recom- 

 mends Hebra's treatment with green soap and alcohol (2:1) to 

 be rubbed on the affected surface and washed off the following 

 day when all scales and crusts will come off with little trouble. 

 He follows with zinc oxide or lotions of mercuric chloride or sil- 

 ver nitrate. Friedberger and Frohner use cresol 2 parts, green 

 soap 2 parts, alcohol i part ; also creosote in alcohol (i : 10) or in 

 paraffin (i : 10). Zuill looks upon sulphur iodide as virtually 



