The endeavor to find a substitute for sole leather was not so successful, even when finally it was decided that leather soles could be made only of animal tissue. There was leather enough for uppers always, and I am inclined to think that the supply of hides was large enough also to fill all reasonable demands for soles. The trouble lay in the nature of the hides, not in their scarcity. Horned cattle in Central Europe are stabled almost throughout the year and in this manner protected against the inclemency of the weather. A tender hide has been the result of this--a hide so tender that, while it will make the finest uppers, is next to useless as a sole.
A very interesting solution was found in the use of wooden soles. A thousand capable brains had been occupied with the sole-leather substitutes, and finally they ruled that wood in its natural state was the next best thing. So far as the rural population was concerned, that was well enough. But wooden soles and city pavements are irreconcilable. How to make that wooden sole bend a little at the instep was the question.
A sole was tried whose two halves were held together under the instep by a sort of specially designed hinge. That seemed an improvement over the single piece of wood, but soon it was found that it had the dangerous tendency to break down arches, which the hinged sole left unsupported at the very point where the support should have been.
The experiments were continued. Inventors and cranks worked at them for nearly two years. The best they ever did was to displace the hinge for a flexible bit of steel plate. Common sense finally came to the rescue. The best shoe with a wooden sole was the one that gave the foot lots of room about the ankle, held the instep snug, and made up for the flexibility of the leather sole by a rounding-off of the wooden sole under the toes. A good and very serviceable wooden-sole shoe with leather uppers had been evolved. The scientists had nothing to do with it.
It was the department of food substitution that was really the most interesting. For decades food in tabloid form has interested the men in the chemical laboratories. Some of them have asserted that man could be fed chemically. Theoretically that may be done; in practice it is impossible. If the intestinal tracts could be lined with platinum men might be able to live on acids of almost any sort. Such is not the case at present, however.