Our national participation in the war has brought with it an enormous demand for prompt and exact statistical information. Such a demand is, of course, an inevitable accompaniment of a war waged under modern conditions. War has come to be a conflict of directed masses?of aggregates. Men, money, muni tions, food, railways, shipping, raw materials, and manufactured products in great variety are impressed into the service of the nation. The problems of the effective control and use for war pur poses of these varied national resources is intimately dependent upon a knowledge of their quantities, that is, upon statistics. Like chemistry, physics, and the applied sciences, statistical knowl edge and the statistical method have come to be important tools of modern warfare. Just as this was is our largest national un dertaking, so its statistical demands constitute, in the aggregate, the largest statistical problem with which we have had to deal. The statistical activities of the federal government in times of peace cover in the main only those phases of national life which are deemed to be of public and especially of political moment. Our census of population is taken primarily to afford a basis for congressional apportionment; our census of manufacturers and our foreign trade statistics still bear the marks of tariff controver sies, and our federal statistics of wages and prices may be traced back to the same origin. In other fields, as diverse as immigra tion and railway transportation, our federal statistics are at once a by-product of federal control and a guide in the exercise ofthat control. In the fields of federal finance, money, and banking, our statistics are largely administrative by-products. The statistical work of the Department of Agriculture is a recognition, inade quate as yet, of a public interest which is probably only in small part political, and so with the statistical work of the Geological Survey and the Bureau of Mines. The work of the Bureau of the Census in the field of vital statistics is the most noteworthy example of the recognition of a large social interest which is not primarily either economic or political. Thus the federal government, in its statistical work, has touched the current of our national life at only relatively few points, and at some of these only intermittently. For the most this current flows on in its own channels, free from disturbance or questioning or measurement by the government. Except to the tax-gatherer, a large part of the productive and business ac tivities of the country have not been deemed to be matters of public concern, even as group aggregates. The changes brought by our entrance into the war have been profound. Other activities have had to be subordinated to the necessities of the efficient and successful conduct of the war. This subordination, we may well believe, is only imperfectly realized as yet. If the war continues it is certain that the field of
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