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 present municipal field. Chicago's lead may well be followed by other American cities-although, of course, a number are already well equipped.

Hind-sight is so easy—and so costly. If, for instance, in the development of our larger cities, especially the comparatively new towns of the middle western states, we had been able to visualize the present day requirements of the automobile, how easily modern traffic problems could have been prepared for. All our cities have faced the experience and the expense of widening streets already built; and all of them are shadow-boxing with the unsolvable puzzle of forcing a thousand automobiles through inadequate thoroughfares designed to handle perhaps a hundred facilely.

It is possible, of course, that long runways won't be necessary for the aircraft of the future. Science may teach us how to alight and take off from very small areas, such as the tops of build-