478 HORSESHOEING. 



The length of time required to effect a re- 

 moval of the crack depends on the treatment 

 and skill of the operator. If the foot is ex- 

 panded by the plate with skill, and the nails in 

 the shoe driven so as to prevent the wall of the 

 foot from closing in on the crack, the plate may- 

 be removed at once ; otherwise it should remain 

 stationary, which can be done by substituting 

 the small screw E, which will not prevent the 

 horse from being used while under treatment. 

 The use of the expansion plate is not necessary, 

 unless the crack extends the whole length of 

 the hoof The crack extending from the coronet, 

 partly down the front of the foot, should be 

 treated at once, removing pressure by short- 

 ening the toe and expanding the foot, as already 

 instructed ; then, by means of the groove and 

 notches, promote a new growth at the coronet. 



THRUSH. 



Is a disease of the frog, most common to a 

 foot which is hoof-bound or contracted, but all 

 horses' feet are subject to it when they are neg- 



