BOOKS ON GEOLOGY. 



The Ice Age in North America, 



And its B farinas upon the Antiquity of Man. By G. FREDERICK 

 WRUIHT, !>.!>., LI,. D. With 152 Maps and Illustrations. Third 

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

 liy WARR.-.N UPHAM, F. G. S. A., and Supplementary Notes 8vo, 625 

 pa^cs, and complete Index. Cloth, $5.00. 



" Professor Wright's work is gre.il enough t > 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 ii.telligent 

 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 Survey 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 6rst appearance of his book. Nearly three fourths of the volume have been 

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

 regions described and verified the repons 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 biought down to date. 



The Cause of an Ice Age. 



By Sir ROBERT BALL, LI.. D., F. R. S., Royal Astronomer of Ireland, 

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

 Series, edited by Sir JOHN LUBBOCK. I2mo. Cloth, $1.00. 



" An exceedingly bright and intcres 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 900 Illustrations. New and 

 enlarged edition. 8vo. Cloth, $4.00. 



D. APPLETON AND COMPANY, NEW YORK. 



