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D. APPLETON & CO.'S PUBLICATIONS. 



'HE ICE AGE IN NORTH AMERICA, and its 

 Bearings upon the Antiquity of Man. By G. Frederick 

 Wright, D. D., LL. D., F. G. S. A., Professor in Oberlin Theo- 

 logical Seminary ; Assistant on the United States Geological 

 Survey. With an Appendix on " The Probable Cause of Gla- 

 ciation," by Warren Upham, F. G. S. A., Assistant on the 

 Geological Surveys of New Hampshire, Minnesota, and the 

 United States. With 147 Maps and Illustrations, One vol., 

 8vo, 640 pages. Cloth, $5.00. 



The writer has personally been over a large part of the field containing the won- 

 derful array of facts of which he is now permitted to write, but he is one only of many 

 investigators who have been busily engaged for the past fifteen years (to say nothing 

 of what had been previously accomplished) in collecting facts concerning the Glacial 

 period in this country. His endeavor has been to make the present volume a fairly 

 complete digest of all these investigations. 



The numerous maps accompanying the text have been compiled from the latest 

 data. The illustrations are more ample than have ever before been applied to the 

 subject, being mostly reproductions of photographs taken by various members of the 

 United States Geological Survey in the course of the past ten years, many of them by 

 the author himself. 



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HE GREAT ICE AGE, and its Relation to the 

 A7itiqnity of Man. By James Geikie, F. R. S. E., of H. M. 

 Geological Survey of Scotland. With Maps and Illustrations. 

 i2mo. Cloth, $2.50. 



A systematic account of the Glacial Epoch in England and Scotland, with special 

 references to its changes of climate. 



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RINCIFLES OF GEOIOGYj or, The Modern 



Changes of the Earth and its Inhabitants, considered as illus- 

 trative of Geology. By Sir Charles Lyell, Bart. Illustrated 

 with Maps, Plates, and Woodcuts. Two vols., royal 8vo. 

 Cloth, $8.00. 



The " Principles of Geology" may be looked upon with pride, not only as a repre- 

 sentative of English science, but as without a rival of its kind anywhere. Growing in 

 fullness and accuracy with the growth of experience and observation in every region 

 of the world, the work has incorporated with itself each established discovery, and has 

 been modified by every hypothesis of value which has been brought to bear upon, or 

 been evolved from, the most recent body of facts. 



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