Diseases of the Foot. 471 



the shoe, in alternate soaking of the hoof in water and 

 drying, and in treads or other temporary wounds or inju- 

 ries to the coronet. The crack extends from the coronet 

 downward, for a -variable distance, in the direction of the 

 horny fibres. If attended by lameness, the laminae are 

 usually being pinched between the edges of the crack, the 

 irritation is perhaps further increased by the presence o/ 

 sand and dirt, and fungous growths may appear in the 

 sore. 



Treatment. A carefully applied bar shoe having an 

 even bearing all round the foot ; a nail driven through the 

 edges of the crack and riveted so as to hold them together ; 

 a transverse groove, f to 1 inch in length, cut to the quick 

 just above the upper end of the crack, and active stimu- 

 lation or slight blistering of the coronet above this point 

 wiU usually succeed in obtaining an unbroken growth 

 from above, and when the crack has grown off at the lower 

 border the hoof is perfect. But the inflammation wiU 

 sometimes demand poulticing ; the nail may have to be 

 replaced by a metallic plate fixed to the hoof on each side 

 of the crack by screws not exceeding a line in length ; a 

 gaping crack may require filling with gutta-percha or 

 other hard substance to keep the edges immovable ; or 

 finally, it may be requisite in bad cas^s to cut out a V- 

 shaped piece of horn, the apex corresponding to the mid- 

 dle of the crack and the two limbs to the coronet on the 

 two sides of the crack. 



FALSE QUAETEE. 



This is similar to a sand-crack in appearance but caused 

 by such destruction of the secreting structure at the top 

 of the hoof that it is impossible to obtain a growth of 

 horn to fill up the interval. Palliation by careful shoeing 

 is aU that can be accomplished. 



HORNY TUMOB OF THE LAMmM. 



This is a result of sand-crack, the irritation leading to 

 an increased secretion of horn on the inner purfaco nf thp 



