EXPLANATION OF PLATE IIL 



DISSECTION SHOWING THE SEAT AND INTERNAL APPEARANCE OF 

 WINDGALLS. (Percival.) 



In this plate is represented the near hind leg of the horse, cut off below 

 the hock, inclined a little in its position so as the more fully to ex- 

 pose to view its outer side: the windgalls formed in it showing 

 rather more development on that than on the opposite side. 



Two of these tumors {a and b) are apparent in it in the usual situation, 

 viz., a little above the fetlock. One of them (a), which is cut open 

 to expose its interior, is seated about a couple of inches higher than 

 the sesamoid bones, being there lodged in front of the perforatus 

 tendon (d) in the interspace between it and the perforans tendon 

 (e); which latter seems as though it actually ran through the cavity 

 of the windgall, owing to the circumstance of the bursa having 

 natural attachments around the borders of the tendon. At the 

 time it was cut open this windgall contained full half an ounce of 

 albuminous fluid, of the aspect and consistence of white of egg, ex- 

 cepting that it was of a beautifully bright, pale yellow color, as the 

 stain it has left upon the tendon (at e) fully indicates. Its charac- 

 ter was truly synovial. 



The other fetlock windgall (b), situated half an inch lower down, is 

 lodged in front of the perforans tendon, between it and the suspen- 

 sory ligament (/"), whose bifurcations afford a habitation for it 

 (at g). In its unopened state the windgall assumes the ordinary 

 bluish or grayish cast windgalls, viewed through their parietes, or- 

 dinarily present. 



The windgall-looking-like cavity within the hollow of the heel (c), 

 though in the subject from which the drawing was taken no more 

 than a healthy bursa, represents well enough the seat of " windgall 

 of the heel." 



