By R. LYDEKKER, B. A.; W. F. KIRBY, F. L. S.; B. B. WOODWARD, F. L. S.; R. KIRKPATRICK; R. I. POCOCK; R. BOWDLER SHARPE, LL. D.; W. GARSTANG, M. A.; F. A. BATHER, M. A., and H. M. BERNARD, M. A. Nearly 800 pages, and 500 Illustrations drawn especially for this work. =Astronomy.= Fully illustrated. By AGNES M. CLERKE, A. FOWLER, F. R. A. S., Demonstrator of Astronomical Physics of the Royal College of Science, and J. ELLARD GORE, F. R. A. S. ALASKA AND THE KLONDIKE. BY ANGELO HEILPRIN. _A Journey to the New Eldorado._ With Hints to the Traveler and Observations on the Physical History and Geology of the Gold Regions, the Condition of and Methods of Working the Klondike Placers, and the Laws Governing and Regulating Mining in the Northwest Territory of Canada. By ANGELO HEILPRIN, Professor of Geology at the Academy of Natural Sciences of Philadelphia, Fellow of the Royal Geographical Society of London, Past-President of the Geographical Society of Philadelphia, etc. Fully illustrated from Photographs and with a new Map of the Gold Regions. 12mo. Cloth, $1.75. “Will take and retain immediate rank as a contribution of essential value not only to the literature of travel, but to that of American commercial and political development.... Should be in the hands of every person interested either in fact or in prospect in Alaska and the Klondike.”—_Brooklyn Standard-Union._ “For the first time the new gold fields of the North have been dealt with by a scientific man capable of weighing evidence.”—_Chicago Evening Post._ “Presents for the first time a plain, straightforward story of what he saw, how he saw it, the men and things he met, what the hardships were and how he overcame them. The book is fully illustrated. It is replete with valuable hints and instruction, and students of the gold problem in Alaska ought to appreciate it. The entire subject has been developed with extreme care and great thoroughness.”—_Boston Globe._ “It is among the practical books, everywhere bearing evidence of its reliability. The story of the journey is told with enough of personal incidents and accidents of travel to make every page interesting to the general reader, and it will be found of practical value to those intending to make the hard journey.”—_Chicago Inter-Ocean._ “Mr. Heilprin observed Dawson with the eyes of a student of great scientific attainments, who had little in common with the crowd of elemental and uncouth men gathered there, or with their life; and he noted many things which they themselves probably accepted as matters of course, besides writing an important scientific treatise.”—_Boston Herald._ “It is noticeably fair-minded in its presentation of facts—the work of a clear-minded and well-trained observer.”—_New York Outlook._