Fifty years -- and the economic, social and political implications of air power, comparable in universal history to the invention of fire and the wheel. ""Our present international society is in the process of adjusting itself to the innovation of flight with space no longer hampering the free communication of ideas, and the interchange of goods and people."" Much of the book is given over to the unique needs of airpower, the fabulous expense necessary for material and research, the police force, state-supervised, necessary for public safety, the military expense of an aggressive or defensive air force, and the new area of legal problems arising with conquest of new spatial territory. The general conclusion is that here is supreme motivation for international understanding. Since the book is addressed to a lay public, it is to be hoped that a glossary of terms will appear in the finished book. And one could wish for more dramatic photographic material than the samples seen.