GEOLOGY 



Vol I. •" Geologic Processes -^nd Their Results" 

 By Prof. THOMAS C. ^HAMBERLIN 



Hi-ads of the Departments of Geology and Geography, University of Chicago ; Members of the United 

 States Geological Survey; Editors of the Journal of Geology 



Prof. ROLLIN D. SALISBURY 



:nts of Geology and Geography, University of Chicago ; 

 States Geological Survey; Editors of the Journal of Geoloj;}- 



With numerous illustrations, including 24 colored maps and 

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



Vol.11. "Earth History." In preparation 



Ch.\s. D. Walcoti', Din-dor of U. S. Geological Survey: " I am impressed with the 

 aiiinirable plan of the worl< 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 tail 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., Ilaniard 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." 



IIenky S. Williams, Va/e Cni'versity : ''It is the best treatise on this part of the 

 subject \*hich we have seen in America." 



R. S. WoODW.-VRD, Columbia University : "It is admirable for its science, admirable 

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



ISR.AEL C. RusSLLL, University of I\Iiehigan ■' I deem it an epoch-making book and 

 one that will vastly extend the study of geology.' 



BUTTER FLIES 



By S. H. SCUDDER 

 THEIR STRUCTURE, CHANGES, AND LIFE-HISTORIES 



With Special Reference to Aiiieruan Forrjts. Being an Applicatioi 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 gy illustrations 



i2mo - - - . $1.50 



THE LIFE OF A BUTTERFLY 



A CHAPTER IN NATURAL HISTORY FOR THE GENERAL READER 

 i6mo - - . ii.oo 



Henry Holt and Company 



29 West 23d Street New York 



