920 VERRUCOSE DERMATITIS. 



amyloform, glutol, or tannoform may be freely applied, the parts 

 enveloped in a thick layer of cotton-wool, and bandaged with 

 considerable pressure. At least once a day the dressing should be 

 renewed, all hard fragments formed by drying of the powder and 

 discharge being gently removed. When the wound becomes dry 

 a little lanolin or other neutral lubricant should be substituted for 

 the powder, the cotton-wool pressure dressing being continued. As 

 a rule, it is more necessary to restrain than to excite the formation 

 of granulations. If the patient be moved too soon they become 

 excessive, and fungous growths appear, which give much trouble. 

 If the coronet become swollen, the horn below must be thinned. 



A common sequel of coronary sloughing is the formation of 

 sinuses just above the heels, in consequence of a necrotic piece of 

 tissue being retained in the depths, and keeping up chronic 

 inflammation and pus formation. The passage of a sublimate seton, 

 or the injection of liquor Villati, is sometimes sufficient to procure 

 healing, but in obstinate cases it may be necessary freely to lay open 

 the parts. 



(d) Dermatitis chronica verrucosa. Verrucose Dermatitis, or 

 " Grease." 



This disease is always chronic and progressive. Originating in a 

 small spot at the fetlock, the process gradually extends until it may 

 involve the leg up to the knee or hock. In other cases a considerable 

 area may be attacked at the outset. It is due to active proliferation 

 in the rete mucosum ; the cells produced, however, do not become 

 horny, but break down and form a fatty, ill-smelling, grey mass on 

 the surface of the diseased skin. In less rapidly progressive forms 

 the cells form a grey, mealy mass. The more intense the process, 

 the more active the proliferation, and the more abundant the 

 exudation which bathes the surface of the skin. The papilla? at the 

 same time increase in size, so that they appear like large warts, and 

 are easily seen. The deeper layers of the cutis, and even of the 

 subcutis, take part in the chronic disease, producing marked 

 elephantiasis. The process extends to the hair follicles ; the hairs 

 are mostly shed, and the few which remain stand erect. 



Jenner declared equine grease to be identical with cow-pox. Since 

 his time " protective grease " has even been spoken of, though neither 

 Jeirner's experiments nor those instituted later in any way support this 

 view. Many years ago it was denied by Leblanc, Delprato, and by other 

 observers, and at the present time no doubt exists that grease is dissimilar 

 to variola. DieckerhofT has suggested that Bouley's " protective grease " 

 was probably stomatitis pustulosa contagiosa (horse-pox). Horse-pox is 

 attended with fever, is very contagious, may effect any portion of the 



