Chamberlin and Salisbury's Geology. 



By THOMAS C. CHAMBERLIX and ROLLIX D. SALISBURY, Pro- 

 fessors in the University of Chicago. (American Science 

 Series.) 3 vols. 8vo. 



Vol. I. Geological Processes and their Results. '04. xix-|- 

 654 pp. $4.00. 



Vols. II and III. Earth History. '05. xxxvii-j-1316 pp. 

 (Not sold separately.) $8.00. 



This is a notable scientific work by two of the highest 

 authorities on the subject in the United States, and yet written 

 in a style so simple that it can be clearly understood by the 

 intelligent reader who has had little previous training in the 



subj ect. 



CHAS. D. WALCOTT, Director of 

 U. S. Geological Survey: I am 

 impressed with the admirable 

 plan of the work and with the 

 thoro manner in which geological 

 principles and processes and 

 their results have been presented. 

 The text is written in an enter- 

 taining style and is supple- 

 mented by admirable illustra- 

 tions, so that the student cannot 

 fail to obtain a clear idea of the 

 nature and work of geological 

 agencies, of the present status 

 of the science, and of the spirit 

 which actuates the working 



geologist. 



ISRAEL C. RUSSELL, University 

 of Michigan: The work is cer- 

 tainly monumental, and, like 

 Lyell's "Principles of Geology," 

 will in the future, I am con- 

 fident, be recognized as marking 

 the beginning of a new period 

 in the development of the science 

 of the earth. 



R. S. WOODWARD, Director of 

 the Carnegie Institution: It is 

 admirable for its science, admi- 

 rable for its literary perfection, 

 and admirable for its unequaled 

 illustrations. 



WILLIAM N. RICE, Wesleyan 

 University: The book is full of 

 new ideas. It is one of the in- 

 dispensable books for the library 

 of every working geologist and 

 every one who wishes to be an 

 up-to-date teacher of geology. 

 My copy stands in the little re- 

 volving bookcase containing my 

 most valued and most constantly 

 used books of reference, along 

 with the classical manuals of 

 Dana and Geikie and Lapparent. 



W. M. DAVIS, Harvard Univer- 

 sity : The whole work forms a 

 most creditable addition to 

 American scientific literature. 

 It is of so advanced and serious 

 a character that not only stu- 

 dents but professional geologists 

 as well cannot fail to benefit 

 greatly from a careful study of 

 its pages. The element of dis- 

 cussion, so important in many 

 debatable problems of geology 

 has seldom been made so prom- 

 inent a feature of a geological 

 treatise; and although this adds 

 decidedly to the difficulty of 

 study, it cannot fail also to add 

 greatly to the value of the 

 knowledge gained from the 

 study. 



