DISEASES OF THE LEGS AND FEET. 119 



must be prevented from extending by cutting a horizontal 

 notch (B B) at either end, thus : 



I 



If the crack extends up to the coronet, a V-shaped notch should 

 be cut at the lower end. thus : 



\l/ 



Next, the sides of the crack should be riveted together by 

 means of a horseshoe nail, the head of which must be filed flat 

 on one side, the flat side to be against the hoof. The nail 

 must be clinched down at both ends. Further, in order to 

 take pressure off the crack, the part of the wall underneath 

 the sand-crack should be prevented from coming into contact 

 with the shoe by paring a slight liollow (C) in it before apply- 

 ing the sho'e. See following sketch : 



Showing Mode of EasiiSg Sand-crack by Paring Wall. 



In the course of time, a sand-crack w^ll disappear by its being 

 pushed down further and further by the growth of new horn at 

 the top of tlie hoof. 



False.quarter. — This is characterised by a downward 

 depression or actual fissure (like sand-crack, but much wider) in 

 the wall at the quarter, extending from the coronet. The 

 complaint is caused by an injury to the horn-secreting struc- 



