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.’ Im preparation 
Cuas. D. Watcott, Director of U. S. Geological Survey: ‘1 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. WiiAms, Yale University: ‘It is the best treatise on this part of the 
subject which we have seen in America.” 
R. S, WoopwarD, 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 
12mo - - - $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 
12mo0 - - - $1.50 
THE LIFE OF A BUTTERFLY 
A CHAPTER IN NATURAL HISTORY FOR THE GENERAL READER 
16mo - - - $1.00 
Henry Holt and Company 
29 West 23d Street New York 
