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To Mr. R. L. Lyman, Instructor in Harvard University, I owe invaluable aid in preparing the notes to this book. I wish to thank also Professor A. B. Hart for some details of these notes. To Professor H. B. Huntington, of Brown University, I owe helpful suggestion and comment when we used the material together at Harvard. In preparing copy for the press I have been greatly assisted by Miss Loraine P. Bucklin. Finally, I keenly appreciate the ready courtesy of the publishers and the authors without whose consent the greater part of this book could not have been reprinted.
G. P. B.