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Rh sheer practical difficulty, contain men who will come to see the need for an expert reporting of their particular environment, then the imagination has a premise on which to work. In the exchange of technic and result among expert staffs, one can see, I think, the beginning of experimental method in social science. When each school district and budget, and health department, and factory, and tariff schedule, is the material of knowledge for every other, the number of comparable experiences begins to approach the dimensions of genuine experiment. In forty-eight states, and 2400 cities, and 277,000 school houses, 270,000 manufacturing establishments, 27,000 mines and quarries, there is a wealth of experience, if only it were recorded and available. And there is, too, opportunity for trial and error at such slight risk that any reasonable hypothesis might be given a fair test without shaking the foundations of society.

The wedge has been driven, not only by some directors of industry and some statesmen who had to have help, but by the bureaus of municipal research, the legislative reference libraries, the specialized lobbies of corporations and trade unions and public causes, and by voluntary organizations like the League of Women Voters, the Consumers' League, the Manufacturers' Associations: by