DISEASES OF THE SKIN AND SCB-TISSOES. 296 



Cases, however, will sometimes occur which set at defiance all 

 our skill. In such we find that either the ligamentary, tendinous, 

 or fleshy parts, or perhaps the bones, are involved, and it often 

 happens that fistulas or pipes run in various directions. Such 

 cases require the services of a surgeon, who will dissect out the 

 fistulous pipes, and remove all the diseased portions of the flesh 

 and bone. The after-treatment is then the same as we have just 

 iadicated. 



Fistulous Withees. 



This disease resembles poll-evil, and, in a majority of cases, 

 owes its origin to the same exciting causes; namely, external 

 bruises, or injury inflicted by a bad-fitting collar or saddle. The 

 treatment is the same as that recommended for the cure of poll- 

 evil. 



"Warts on the Skin. 



Warts are of two kinds. One of these makes its appearance 

 upon, and consists in part of an increased development of, the 

 outer scurf or scarfskin ; the other kind is contained under, and, 

 while it elevates, does not grow from the scarfskin. As it fre- 

 ciuently becomes desirable to remove these growths, and to coun- 

 teract that condition of skin on which their reproduction depends, 

 we shall briefly describe them. The most common kind of wart, 

 and that called the true angleberry, is the first of the two to which 

 we have alluded. It has always a hard, horny sort of investment 

 externally. This is formed of scales of scarfskin matted together 

 in great quantities, and prolonged from the true skin, to which 

 they are attached. As this outer covering increases in growth, it 

 dries and splits up into shreds or fibers, which generally become 

 more or less pointed at their free ends. Many of these shreda 

 may grow from one common stock or pedicle, called the " neck." 

 In other cases there is no well-defined neck, and a large surface 

 will be covered with a coarse, rough, and horny crop of warts, all, 

 as it were, united where they originated from the skin. 



Cause. — Warts are always produced from what may be consid- 

 ered as greatly-developed knots, or papillae, within the true skin. 

 Blood, in greater quantities than natural, is sent to these, and the 

 papillae continuing to grow, forms perceptible tumors, which are 

 somewhat sensitive, painful if exposed to friction, and form V 



