Skin Diseases. 277 



PARASITIC GREASE. CONTAGIOUS FOOT-BOT IN SHEEP. 



In inflammation of the horse's heel, attended with 

 fungus-hke growths {grapes), a vegetable growth is often 

 present and seems to be a main cause of the disease. 

 The contagions foot-rot in sheep presents the same appear- 

 ance of the skin, and is presumably due to a similar para- 

 site. With or without an abrasion, the matter from a 

 diseased foot produces in the healthy one sweUing, excori- 

 ation and fungous growths round the top of the hoof, as 

 well as an excessive growth, softening and loss of cohesion 

 of the horny elements below. 



Fig. 45. 



ig. 45 — Oidium Batracosis from parasitic grease. — Megnin. 



Treatment consists in laying bare the diseased surface, 

 and applying active caustics and parasiticides. Pare the 

 horn to the quick and apply tow soaked in tincture of 

 muriate of iron, butter of antimony, solution of blue-stone 

 or nitrate of silver, bind up firmly, and repeat the dressing 

 daily. All overgrown horn must be carefully removed, 

 and means taken to prevent irritation from dried mud, etc. 



MANGE. SCAB. ITCH. SCABIES. ACAEIASIS. 



These names among others are given to diseases of the 

 skin caused by acari. Of parasitic acari there are three 

 principal species : Sarcoptes, which burrow in canals in the 

 ecarfskin and are difficult to find and eradicate, and derma- 

 tophagus and dermatocoptis which live on the surface or 

 among the scabs and are more easily disposed of. Another 



