Veterinary notes for horse owners : a manual of horse medicine and surgery . he horses THE SHOE. 727 foot in various ways with the erroneous view of causing the heelsto open out, or to prevent them from contracting. An exami-nation of the animals foot shows us that the horn at the heelsis secreted by the membrane which is wrapped round the endsof the wings of the pedal bone. Hence, it is impossible to reallyopen out the heels without first fracturing the pedal bone. Thehorny heels undoubtedly wire in, if they are allowed to growtoo long; but this is a merei temporary condition. To useProfessor


Veterinary notes for horse owners : a manual of horse medicine and surgery . he horses THE SHOE. 727 foot in various ways with the erroneous view of causing the heelsto open out, or to prevent them from contracting. An exami-nation of the animals foot shows us that the horn at the heelsis secreted by the membrane which is wrapped round the endsof the wings of the pedal bone. Hence, it is impossible to reallyopen out the heels without first fracturing the pedal bone. Thehorny heels undoubtedly wire in, if they are allowed to growtoo long; but this is a merei temporary condition. To useProfessor Williams words, the hoof is a simple horny box whichneither expands nor contracts, as these terms are popularly under-stood. The foot, like all other structures, is, of course, liable towaste away from want of use; and it may be strengthened andenlarged by being well exercised, though not by any mechanicalcontrivances for opening it out. The Shoe. The following considerations should determine the shape ofthe shoe:—1st. The foot-surface of the shoe should be flat, as in. Fig. 187. a concave shoe.


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