PLATE XT 



(Foimins; the Fionti^vk'ce to Part M, Vol. IV.) 



WINDGALLS. 



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 expose to 

 view its outer side : the windgalls formed in it shewing rather more deve- 

 lopment on that than on the opposite side. 



Two of these tumours (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, excepting that it was of a beautifully bright, pale yellow colour, 

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

 racter was truly synovial. 



The other fetlock windgall (6), situated half an inch lower down, is lodged in 

 front of the perforans tendon, between it and the suspensory ligament (/), 

 whose bifurcations afford a habitation for it (at g). In its unopened state 

 the windgall assumes the ordinary bluish or greyish cast windgalls, viewed 

 through their parietes, ordinarily 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," as de- 

 scribed as a rare and hitherto undemonstrated cause of lameness, at 

 page 308. 



