William N. Rico, Professor in Wesleyan University: The 

 ' x>k is full of new ideas. It is one of the indispensable 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, Professor in Harvard University : The whole 

 work forms a most creditable addition to American scientific litera- 

 ture. It is of so advanced and serious a character that not only 

 students but professional geologists as well cannot fail to benefit 

 greatly from a careful study of its pages. The element of discussion, 

 so important in many debatable problems of geology, has seldom been 

 made so prominent 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. 



Bailey Willis, Carmgie Institution : After careful examin^ 

 tion of the three volumes I desire to express my opinion that they 

 constitute the most important contribution to the philosophy of geology 

 which has appeared since the publication of Lyell's "Principles." 

 They mark an epoch in the advance of the science, and must for a 

 long time afford the basis of working theories of progressive geologists. 



E. R. Cumings, Professor in Indiana University: It is far 

 and away the best advanced text-book of geology in the language. 

 During the past year I have of course made a very minute study of 

 Volume I, and I am sure my statement is not too strong. Volumes II 

 and III are in a class by themselves in their treatment of Earth 

 History, especially in the attention paid to continental evolution a 

 subject neglected in most text-books. 



HENRY HOLT AND COMPANY 



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