SANDCEACK. 



175 



crack by tlie unuatunil manner in wliicli the entire weight of I lie 

 animal is tiii'own on the crust ot tlie lnut, instead of Ijeing dis- 

 tributed, as nature intended it to l:ie, between the waU, the frog, the 

 outer portion of the sole, and tlie bars ; irritation being conse- 

 quently set np in tlie seci'eting mendjrane from inidue concussion. 



Fig. 51. — Bar shoe, designed to give pressure on die frog. 



A "seated shoe" is a shoe affording pressure only to the wall ot 

 the hoof, and made concave on its upper surface, so as to take all 

 the pressure off the sole. The effects of fast work on hard ground 

 will aid in inducing the process of perverted secretion. If these 

 influences be kept up for some time, that portion of the hoof, 

 namely, the upper par't, secreted under them, will be liafjle t<j split, 



