  For the purely biographical portion of this book an especial acknowledgment of obligation is due to the valuable collection of Prescott's letters and memoranda made by his friend George Ticknor, and published in 1864 as part of Ticknor's Life of W. H. Prescott. All other available sources, however, have been explored, and are specifically mentioned either in the text or in the footnotes. H. T. P. COLUMBIA UNIVERSITY, |
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