But as a large portion of mankind tread on artificial hard surfaces, especially pavements, their feet are subjected to a very unnatural amount of wear and tear. How great this is the inhabitants of cities are apt to forget. After passing some months in the country, we have repeatedly found ourselves terribly lamed and shaken by our first walk on the pavement. A party of city-folk who landed on a beach upon Cape Cod complained greatly to one of the natives accompanying them of the difficulty of walking through the deep sand. "Ah," he answered, "it's nothing to the trouble I have walking on your city-sidewalks." To save the feet from the effects of violent percussion and uneven surfaces, they must be protected by thick soles, and thick soles require strong upper-leather. When the foot is wedged into one of these casings, a new boot, a struggle begins between them, which ends in a compromise. The foot becomes more or less compressed or deformed, and the boot more or less stretched at the points where the counter-pressure takes place. On the part of the foot, the effects of this warfare are liable to show themselves in thickening and inflammation of the integuments, in displacement of the toes, and occasionally in the breaking down of the transverse or longitudinal arches. On the part of the boot or shoe, there is a gradual accommodation which in time fits it to the foot almost as if it had been moulded upon it, so that a little before it is worn out it is invaluable, like other blessings brightening before they take their flight.