134 DISEASES OF THE HORSE’S FOOT 
the amount of total expansion of the heels registers 
nearly an inch. That the method requires the greatest 
care may be gathered from the reports of continental 
writers. They state that frequently the pain and con- 
sequent lameness keep the patient confined to the stable 
for several days. 
Numerous and but slightly differing forms of the dilator 
Fic. 75.—Ds Fay’s Vick. 
are on the market. As in principle they are all essentially 
the same, and are to be found illustrated in any reliable 
instrument catalogue, they need no description here. 
(c) Hartmann’s.—A further useful expansion shoe is that 
of Hartmann’s (Fig. 76), in that it may be adapted for either 
unilateral or bilateral contraction. This shoe is also provided 
with bar-clips, and forcibly expanded at the heels by means 
of a dilator. The expansion is governed by saw-cuts 
through the inner margin of the shoe directed towards its 
