HORSESHOEING. 205 



If a loose wall occur upon the foot of a horse while running 

 barefoot, all separated horn should be removed ; if, on account 

 of the nature of the ground, this seems to be impracticable, the 

 hoof must be shod. 



Care of the Hoof. — Shoe at least every four to five weeks. 

 Preserve the pliancy and toughness of the horn by judicious 

 moistening. 



4. Hollow Wall. 



A hollow wall is one in which a separation has occurred be- 

 tween the middle layer of the wall and the heraphyllous layer. 

 This crack or separation 

 always extends in the di- 

 rection of the layers of 

 the waU (Fig. 223, b). 



Occurrence. — Quite 

 rare. 



We should suspect a 



hollow wall when a part ^^ imaginary transverse vertical section of a hoof 

 •'■ showing (a) loose wall and (6) hollow wall. 



of the wall rounds out 



prominently beyond the rest, and gives forth a hollow (reson- 

 ant) sound when struck. The white line presents a crack, yet 

 we should hesitate to form a conclusion as to the extent of 

 the separation from the extent of the crack along the white 

 line, since the latter may be considerably smaller. The separa- 

 tion extends higher up the Avail than in the case of loose wall, 

 frequently to the coronet. The cavity is usually filled with 

 crumbling, disintegrated horn. 



Hollow wall is not often accompanied by pain. Lameness 

 may arise, however, if the hollow section of wall assists in 

 bearing the body-weight, and if the animal does fast work 

 upon paved streets. 



Causes. — Mechanical influences resulting in chronic inflam- 

 mation of fleshy leaves. 



Treatment. — A cure is possible, but requires considerable 

 time. In shoeing, which should always aim to relieve pressure 



