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 " l^robable Cause of Glaciation," 

 by Warri:,n Upham, F. G. S. A., and Supplementary Notes 8vo, 625 

 pages, and complete Index. Cloth, ^5x0. 



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

 a page that is noL instructive and suggestive. It is sure tj make a repiaalion abroad 

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

 of tlie iivmg 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. Geoloj^ical Survey of Scotland. Third edition, laigely 

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



In this new edition the author has profited by ihe sources of information or^net^ 

 since the first appearance of his book. Neai-ly three fourths of the volume have been 

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

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

 edgment of recent American students of the Ice Age. 'J he new edition oflfers a com- 

 prehensive survey of this fascinating subject biought down to date. 



The Cause of an Ice Age. 



By Sir Robfrt Ball, LI-. D., F. R. S., Royal Astronomer of Tj eland, 

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

 Series, edited by Sir John Lubbock. i2mo. Cloth, $i.co. 



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

 ical revolutions of which our earth has oeen the scene Ot the various ages traced and 

 located by scientists, none is more interesting or can be n?ore so than the Ice Afe, and 

 never h^ve its phenomena been more clearly and prapliically described, or its causes 

 more definitely located, than in this thrillingly interesting \olume." — 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 Natnial History in the 

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

 enlarged edition. 8vo. Cloth, S400. 



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

 ing a comprehensive text-bo-ik suited to pre«;ent demands, Prnfe.=sor I e Conte has 

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

 The eximples 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. 



