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Rh assisted me in this work. The subjects upon which I have touched are of a scope that is far beyond the possibility of expert knowledge by any one man. What I have been able to accomplish, such as it is, would have been impracticable without the coöperation of a good many men. I owe special thanks to Dr. B. M. Anderson, Jr., economist of the Chase National Bank, Messrs. Raleigh S. Rife, economist, and J. Christy Bell, of the Guaranty Trust Co., Mr. L. F. Loree, president of the Delaware & Hudson Railway, to the statisticians and other officials of a large number of the great industrial companies, and to the officers of many of the bureaus of the Government in Washington, especially in the Departments of Agriculture, Commerce and the Interior, and the Interstate Commerce Commission and the U. S. Shipping Board. My friends, Dr. George Otis Smith, director of the Geological Survey and Mr. W. M. Steuart, director of the Census, were particularly helpful in their generous responses to my appeals for assistance.

I am under obligation also to Dr. W. I. King for valuable aid in my research work and for helpful criticisms following his reading of portions of the manuscript.

I am especially indebted to my friend, Dr. Oswald Knauth, secretary of the National Bureau of Economic Research. In many conferences respecting this work, from its very conception, he was ever helpful in inspiration and discussion, and upon its completion he did me the favor to read the whole manuscript and aided me with many valuable criticisms and suggestions. .
 * December 30, 1921.
 * December 30, 1921.
 * December 30, 1921.