DISEASES OF THE FOOT. 501 



sufficiently deep to expose the sensitive laminae, or until it has extended 

 to the coronary band. 



In treatment we have to reckon with the fact that a fracture or divi- 

 sion of the horn or wall has taken place. The horn will never re-unite. 

 Our object must be to produce as speedily as possible a new growth of 

 horn from the coronet. This is the first point in treatment. The next 

 point is to prevent the further splitting upwards of the wall. For this 

 purpose a transverse nick should be made with the rasp in the undivided 

 horn above the split, if at least the split has not extended to the coronet. 

 The shoe must be removed, and an " arch " about one or one and a half 

 inches wide must be made on the wearing or ground surface of the wall, 

 and about an inch or more in height. The shoe must then be replaced. 

 The object of this is to take all bearing or weight off the part of the crust 

 affected by the split. The further treatment consists in promoting a 

 new growth of horn from the coronet. With this object the coronet 

 must be sharply blistered with ointment composed of equal parts of bin- 

 iodide of mercury and cantharides, one part of each to eight of lard, 

 which will speedily give rise to increased secretion of horn. The horn 

 will usually grow down with a projection or " knob " which gives extra 

 strength at the end of the new growth. A day or two after the blister- 

 ing, the horn should be immersed in hot water three or four times a day, 

 and a wet swab should be kept on the hoof between the immersions, but 

 great care must be taken that the swab does not come in contact with the 

 blistered coronet. As soon as the skin which has been blistered is well, 

 which will generally be in about a fortnight, the horse may be put to 

 work, but should be shod with tips for a time at least, if not permanently. 



In cases where the split in the horn has extended to the coronet the 

 treatment will in the main be the same, but the horse must not be put to 

 work until the new horn has grown down at least an inch and a half. 



In the cases of horses subject to sandcrack or shelly feet, the coronet 

 should be periodically stimulated with a weak blister in order to increase 

 the growth of the horn. 



Sandcracks being more or less constitutional are apt to recur. 



1013. False Quarter. 



When any part of the coronary band is involved in serious inflamma- 

 tion, its ordinary secretions are necessarily arrested. If the inflammation 

 is long continued, the portion of the band affected becomes wholly dis- 

 organised and its vitality is destroyed. As the crust is secreted from 

 the coronary band, it necessarily follows that there must be a break or 

 separation of the crust immediately below the place where the injury to 

 the secreting surface has occurred. This separation is called False 

 Quarter. 



The disease in the coronary band is usually the result of a tread or of 

 quittor, or sandcrack, or of any external injury sufficient to produce 

 violent inflammation in the secreting substance, and consequent arrest 

 of its secretion. 



