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THE HUMAN SKIN
99
down upon a whitlow. Friction against a hard substance brings about this extra thickness and hardness; the young ladies who handle silk, woollen or cotton textures all day long in shops have soft hands. Like begets like; and hard roads make hard feet for horses, in spite of all superstition to the contrary. The writer has more than a quarter of a century of experience and practice with unshod horses in large numbers. He has, therefore, no theory about the matter, constructed, as may perhaps be imagined, upon the quotations he has so freely used from the writings of scientific, professional, and practical authorities.
