GEOLOGY 



Vol I. " Geologic Processes and Their Results" 

 BY Prof. THOMAS C. CHAMBERLIN 



AND 



Prof. ROLLIN D. SALISBURY 



Heads of the Departments of Geology and Geography, University of Chicago ; Members of the United 

 States Geological Survey; Editors of the Journal of Geology 



With numerous illustrations, including 24 colored maps and 

 3 tables. 654 pages, 8vo, $4.00 net 



Vol. II. " Earth History." In preparation 



CHAS. D. WALCOTT, Director of U. S. Geological Survey: " I am impressed with the 

 admirable plan of the work and with the thorough manner in which geological principles 

 and processes and their results have been presented. The text is written in an entertaining 

 style and is supplemented by admirable illustrations, so that the student cannot fail to obtain 

 a clear idea of nature and the work of geological agencies, of the present status of the 

 science, and of the spirit which actuates the working geologist." 



T. A. JAGGAR, Jr., Harvard University : " An excellent statement of modern Ameri- 

 can geology, with abundant new illustrative material based upon the most recent work of 

 government and other surveys." 



HENRY S. WILLIAMS, Yale University: "It is the best treatise on this part of the 

 subject whjch we have seen in America." 



R. S. WOODWARD, Columbia University . "It is admirable for its science, admirable 

 for its literary perfection, and admirable for its unequalled illustrations." 



ISRAEL C. RUSSELL, University of Michigan, " I deem it an epoch-making book and 

 one that will vastly extend the study of geology.' 



BUTTERFLIES . 



BY S. H. SCUDDER 

 THEIR STRUCTURE, CHANGES, AND LIFE-HISTORIES 



With Special Reference to American Forms. Being an Application of the ' ' Doctrine of 

 Descent " to the Study of Butterflies. With an Appendix of Practical Instruction 



i2mo $1-50 net 



Brief Guide to the Commoner Butterflies of the Northern 

 United States and Canada 



Being an Introduction to the Knowledge of their Life-Histories 



New edition. With 21 plates, containing in all 97 illustrations 

 I2mo $1*50 



THE LIFE OF A BUTTERFLY 



A CHAPTER IN NATURAL HISTORY FOR THE GENERAL READER 



i6mo $1.00 



Henry Holt and Company 

 29 West 23d Street New York 



