Only the principal works consulted and found to contain valid contributions to the solution of the problem of the earth's interior.
BALL, SIR ROBERT STOWELL, LL. D., F. R. S., Lowndean Professor of Astronomy in the University of Cambridge. A Popular Guide to the Heavens. New York. D. Van Nostrand Company. 1904.
BARRINGTON, THE HON. D. AND COLONEL BEAUFOY, F. R. S., The Possibility of Approaching the North Pole Asserted. New York. James Eastburn & Company. 1818.
BRUCE, WILLIAM S., LL.D., F. R. S. E. Polar Exploration. New York. Henry Holt and Company. 1911.
BUEL, J. W. The World's Wonders as Seen by the Great Tropical and Polar Explorers. St. Louis, Mo., and Philadelphia, Pa., Historical Publishing Company. 1884.
CHAMBERLAIN, THOMAS CHROWDER, head of the department of geology, the University of Chicago. The Origin of the Earth. Chicago. University of Chicago Press. 1916.
CHAMBERS, GEORGE F., F. R. A. S. Stories of the Universe: the Stars. New York, Review of Reviews Company. 1909.
COOK, DR. FREDERICK A., My Attainment of the Pole. New York and London, Mitchell Kennerley. 1913.
DAVENPORT, HENRY, D.D., Earth, Sea and Sky or the Marvels of the Universe.
DENOVAN, WILLIAM, Editor, (author of "The Laws of Nature") Story of the World's Wonders. 1897.
DICK, HERMAN, A. AL, The Marvellous Wonders of the Polar World. Richmond, Va., B. F. Johnson & Co.
EDWARDS, DELTUS. M., The Toll of the Arctic Seas. New York, Henry Holt & Company. 1910.
FLAMMARION, CAMILLE, translated from the French and edited by James Glaisher, F. R. S., The Atmosphere. New York, Harper & Brothers. 1873.
GIBSON, CHARLES, F. R. S. E., The Romance of Scientific Discovery. London, Seeley Service & Co. 1914.
GIBSON, CHARLES, F. R. S. E., The Great Ball on Which We Live. London, Seeley Service & Co. 1915.
GORDON, W. J., Round About the North Pole. New York., E P. Dutton & Company. 1907.
GREELY, ADOLPHUS W., Three Years of Arctic Service, An Account of the Lady Franklin Bay Expedition of 1881-1884 and the Attainment of the Farthest North. New York. Charles Scribner's Sons. 1886.
GREW, EDWIN SHARPE, M. A., The Growth of a Planet. New York. The Macmillan Company. 1911.
GREW, E. S., M. A., editor of "Knowledge." The Romance of Geology. London. Seeley & Co. 1911.
HAYES, DR. I.I., The Open Polar Sea: a Narrative of a Voyage of Discovery Towards the North Pole in the Schooner United States. New York. Hurd & Houghton. 1867.
KANE, ELISHA KENT, M. D., U. S. N. Arctic Explorations in the Years 1853-54-55. Philadelphia. J. B. Lippincott & Company. 1856.
KANE, ELISHA KENT, M.D., U. S. N., Arctic Explorations in Search of Sir John Franklin. 1853-54-55. Philadelphia. J. B. Lippincott & Company. 1856.
LE CONTE, JOSEPH. Elements of Geology. New York. D. Appleton & Company. 1909.
NORDENSKIOLD, DR. N. OTTO G. and DR. JOHANN GUNNAR ANDERSON, Antarctic: or Two Years Amongst the Ice of the South Pole. London, Hurst & Blacket. New York, The Macmillan Company. 1905.
NORDENSKIOLD, ADOLF ERIK, The Arctic Voyage of 1858-1879. London, Macmillan & Company. 1879.
PAYER, JULIUS, one of the commanders of the expedition, New Lands Within the Arctic Circle. New York. A. Appleton & Company. 1877.
PHIN, JOHN, The Seven Follies of Science, a Popular Account of the Most Famous Scientific Impossibilities. New York. D. Van Nostrand Company. 1912.
POUCHET, F. A., M. D., The Universe or the Infinitely Great and the Infinitely Little. Charles Scribner & Co. 1870.
PROCTOR, RICHARD A., Our Place Among Infinities: A Series of Essays Contrasting Our Little Abode in Space and Time With the Infinities Around Us. New York. D. Appleton & Company. 1881.
PROCTOR, RICHARD A., B. A. Camb. F. R. A. S., Light Science for Leisure Hours. New York. D. Appleton & Company. 1871.
PROCTOR, RICHARD A., The Poetry of Astronomy. London. Longmans, Green & Co. 1880.
RECLUS, ELISEE. The Earth: A Descriptive History of the Life of the Globe. New York. Harper & Brothers. 1872.
SARGENT, EPES. Perils and Escapes Among Icebergs: the Wonders of the Arctic World: A History of All the Researches and Discoveries in the Frozen Regions of the North From the Earliest Times. Philadelphia, John E. Potter & Company. 1873.
SCOTT, O. FIRTH, The Romance of Polar Exploration. London. Seeley Service & Co. 1915.
LOWELL, PERCIVAL, A. B., LL. B. Mars. Boston and New York. Houghton Mifflin Company. 1894.
LOWELL, PERCIVAL. Mars as the Abode of Life. New York. The Macmillan Company. 1910.
LOWELL, PERCIVAL. The Evolution of Worlds. New York. The Macmillan Company. 1910.
MCCLINTOCK, CAPTAIN, R. N., LL.D. A Narrative of the Discovery of the Fate of Sir John Franklin and His Companions. New York. J. T. Lloyd. 1860.
MACPHERSON, HECTOR, JR. The Romance of Modern Astronomy. London. Seeley, Service & Co. 1913.
MAUNDER, E. WALTER. F. R. A. S., Superintendent of the Solar Department, Royal Greenwich Observatory. Are the Planets Inhabited? London and New York. Harper & Brothers. 1913.
MELVILLE, GEORGE 'W., Chief Engineer, U. S. N. A Narrative of the Search for Lieutenant-Commander De Long, Followed by an Account of the Greely Relief Expedition. Boston. Hough-ton Mifflin Company. 1892.
MILLER, HON. J. MARTIN, editor. Discovery of the North Pole: Dr. Frederick Cook's Own Story of How He Reached the North Pole, April 21, 1908, and the Story of Commander Peary's Discovery of April 6, 1909. 1909.
MITCHELL, O. M., LL.D. Director of the Cincinnati and Dudley Observatories. A Concise Elementary Treatise on the Sun, Planets, Satellites, and Comets. New York, Phinney, Blakeman & Mason. 1860.
MORSE, EDWARD S., Member National Academy of Science. Mars and Its Mystery. Boston. Little, Brown & Co. 1906.
MOULTON, FORREST RAY, A. B., Ph. D. Professor of Astronomy at the University of Chicago. Descriptive Astronomy. Chicago. American School of Correspondence. 1912.
MOULTON, F. R. An Introduction to Astronomy. New York. The Macmillan Company. 1906.
NANSEN, FRIDTJOF, G. C. V. O., D. Sc., D. C. L., Ph. D. Professor of Oceanography in the University of Christiana, etc. In Northern Mists, Arctic Exploration in Early Times. 2 vols. London. William Heinemann. 1911.
NANSEN, FRIDTJOF, The First Crossing of Greenland. 2 vols. London. Longmans, Green & Co. 1890.
NANSEN, DR. FRIDTJOF, Farthest North: Being the Record of a Voyage of Exploration of the Ship Fram 1893-1896 and of a Fifteen Months Sleigh Journey by Dr. Nansen and Lieut. Johnson. 2 vols. New York and London. Harper & Brothers. 1898.
NANSEN, DR. FRIDTJOF, Farthest North. 2 vols. New York and London. Harper & Brothers. 1879.
NEWCOMB, SIMON, L. L. D., Superintendent American Nautical Almanac. Popular Astronomy. New York. Harper & Brothers. 1882.
NEWCOMB, SIMON, LL. D., Astronomy for High Schools and Colleges. New York. Henry Holt & Company. 1883.
NEWCOMB, SIMON, LL. D., Professor of U. S. Naval Observatory. Popular Astronomy. Harper & Brothers. 1879.
SENN, DR. NICHOLAS, M. D., Ph. D., C. M., In the Heart of the Arctics. Chicago. W. B. Conkey Company. 1907.
SERVISS, GARRETT P., Curiosities of the Sky: A Popular Presentation of the Great Riddles and Mysteries of Astronomy. New York and London. Harper & Brothers. 1909.
STEFANSSON, VILHJALMER, My Life With the Eskimo. New York. The Macmillan Company. 1913.
Symmes' Theory of Concentric Spheres, by A Citizen of the United States. Morgan Lodge & Fisher. 1826.
TODD, DAVID, M. A., Ph. D., New Astronomy. New York and Chicago. American Book Company. 1897.
WILLIAMS, HENRY, Editor and compiler, Curious Facts Relating to Almost Anything Under the Sun. New York. A. L. Burt Company. 1903.
Scientific American, published by Munn & Co., New York.
Scientific American Supplement. Munn & Co., New York.