It is with pleasure I make grateful acknowledgment to the gentlemen who have accorded me their gracious permission to quote from their works, to Commander Robert E. Peary, to Major-General A. W. Greely, and Sir Allen Young, and to the following publishers and others who, by furnishing material or giving consent to use selected matter, or by kind assistance in other ways, have made my work possible: The American Publishing Company, Hartford, Conn., for selections from “Our Lost Explorers”; D. Appleton & Company for selections from Charles Lanman’s “Farthest North” and Payer’s “New Lands within the Arctic Circle”; The Century Company for selections from General Greely’s article on “The Northwest Passage”; to Clinedinst, Washington, D.C., for permission to reproduce the copyright portraits of Admirals Schley and Melville, General Greely, and Commander Peary; Constable & Company, and E. P. Dutton & Company, Ltd., London, for permission to reproduce the portrait of Amundsen in the latter’s work, “The Northwest Passage”; Doubleday, Page & Company for selections from Commander Peary’s “Nearest the Pole,” and for the portrait of Anthony Fiala and other illustrations from the latter’s work, “Fighting the Polar Ice”; The Encyclopædia Britannica Company for a selection from an article by Markham on “Polar Regions”; to J. Scott Keltie, Esq., editor of the _Geographical Journal_, for selections from that journal; Houghton; Mifflin Company for selections from “The Voyage of the Jeannette” and Melville’s “In the Lena Delta”; Dodd, Mead & Company for selections from the Duke of Abruzzi’s “On the Polar Star”; Benjamin B. Hampton, Esq., for permission to reproduce photographs of the Peary expedition of 1908 and Commander Peary’s map, and Mr. Hampton and the _New York Times_ for permission to quote Commander Peary’s telegram announcing his discovery of the Pole; the editor of the _Illustrated London News_ for permission to reproduce the portraits of Sir Edward Belcher, Captain Nares, and Commander Markham; Little, Brown & Company for selections from General Greely’s “Handbook of Polar Discoveries”; The London Agency for Ordnance Maps for selections from Sir Allen Young’s “Pandora Voyages”; Longmans, Green & Company for selections from Nansen’s “First Crossing of Greenland” and Sverdrup’s “New Land”; the editor of _McClure’s Magazine_ for a selection from Mr. Baldwin’s article on “The Baldwin-Ziegler Arctic Expedition,” which appeared in that magazine in 1901-1902; Albert Operti, Esq., for permission to reproduce the portraits of W. H. Gilder, Lieutenant Schwatka, Colonel Brainard, Captain De Long, and Lieutenant Lockwood; C. Kegan Paul & Company for a selection from Markham’s “Great Frozen Sea”; G. P. Putnam’s Sons for a selection from Mr. Alger’s article on “Roald Amundsen,” which appeared in _Putnam’s Monthly_; the editor of the _American Review of Reviews_ for a selection from Mr. McGrath’s article on “Polar Exploration,” which appeared in that