BOOKS ON GEOLOGY. 



The Ice Age in North America, 



And its Bearings upon the Antiquity of Man. By G. Frederick 

 Wright, D. D., LL. D. With 152 Maps and Illustrations. Third 

 edition, containing Appendix on the " Probable Cause of Glaciation^" 

 by Warren Upham, F. G. S. A., and Supplementary Notes 8vo, 625 

 pages, and complete Index. Cloth, $5.00. 



" Professor Wright's work is great enough to be called monumental There is not 

 a page that is not instructive and suggestive. It is sure to make a reputation abroad 

 as well as at home for its distinguished author, as one of the most active and intelligent 

 of the living students of natural science and the special department of glacial action." 

 —Philadelphia Bulletin. 



The Great Ice Age, 



And its Relation to the Antiquity of Man. By James Geikie, F. R. S. 

 E., of H. M. Geological Sur\-ey of Scotland. Third edition, largely 

 rewritten. With Maps and Illustrations. 8vo. Cloth, $7.50. 



In this new edition the author has profited by the sources of information opened 

 since the first appearance of his book. Nearly three fourths of the volume have been 

 entirely rewritten, and the remainder revised and tearranged. lie has visited the 

 regions described and verified the reports of others, and he makes a special acknowl- 

 edgment of recent American students of the Ice Age. The new edition offers a com- 

 prehensive survey of this fascinating subject brought down to date. 



The Cause of an Ice Age. 



By Sir Robert Ball, LL. D., F. R. S., Royal Astronomer of Ireland, 

 author of "Starland." The first volume in the Modern Science 

 Series, edited by Sir John Lubbock. i2mo. Cloth, $1.00. 



" An exceedingly bright and interes' ing discussion of some of the marvelous phys- 

 ical revolutions of which our earth has been the scene Of the various ages traced and 

 located by scientists, none is more interesting or can be more so than the Ice Age, and 

 never have its phenomena been more clearly and graphically described, or its causes 

 more definitely located, than in this thrillingly interesting volume." — Boston Traveler. 



Elements of Geology. 



A Text-Book for Colleges and for the General Reader, By Joseph 

 Le Conte, LL. D., Professor of Geology and Natural History in the 

 University of California. With upward of goo Illustrations. New and 

 enlarged edition. Svo. Cloth, S4.00. 



" A good college text-book of geology has hitherto been wanting. Besides prepar- 

 ing a comprehensive text-bo^k suited to present demands, Professor l>e Conte has 

 given us a volume of great value as an exposition of the subject, thoroughly up to date. 

 The examples and applications of the work are almost entirely derived from this coun- 

 try, so that it may be properly considered an American geology. This is of advantage 

 to the American student." — Popular Science Monthly. 



D. APPLETON AND COMPANY. NEW YORK. 



