Alvord (formerly Miss Idress Head, Librarian of the Missouri Historical Society); Ignacio Molina, Head of the Cartography Section, Department of Fomento, Mexico; Charles W. Stewart, Librarian of the Navy Department; James W. Cheney, long the Librarian of the War Department; Major Gustave R. Lukesh, Director, and Henry E. Haferkorn, Librarian of the United States Engineer School, Washington Barracks; D. C. Brown, Librarian of the Indiana State Library; Victor H. Paltsits, Department of MSS., New York Public Library; W. L. Ostrander of the library at West Point; Lieutenant James R. Jacobs, 28th United States Infantry; Dr. Katherine J. Gallagher; Dr. Martha L. Edwards. To the widow of Admiral Charles S. Sperry and their son, Professor Charles S. Sperry, the author is particularly indebted for an opportunity to examine important papers left by William L. Marcy. Valuable suggestions were most kindly given by Dr. William A. Dunning of Columbia University and Dr. Davis R. Dewey of the Massachusetts Institute of Technology, who read portions of the text, by Francis W. Halsey, Esq., of New York, who read nearly all of it, and by Dr. Edward Channing of Harvard University, who was so good as to look over more or less closely all of the proofs. To the helpers not mentioned by name the author begs leave to offer thanks no less sincere.

Finally, the author desires to mention the enterprise and public spirit shown by the publishers in bringing out so expensive a work at this time of uncertainty.

The Century Club, New York
     September, 1919.

CONTENTS OF VOLUME I