William N. Ricc^, Professor in Wesleyan Uni-iersity: — The 

 book is full of new ideas. It is one of the indispensable bonks 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 Httle 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 vi^hole 



fl'ork forms a most creditable addition to American scientific litera- 

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

 students Vjut professif)nal geologists as well cannot fail to benefit 

 greatly from a careful study of its pages. The element of discussioUj 

 so important in man}' 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, Carnegie Institution : — After careful examine 



tion of the three v©lumes 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 stud}' of 

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

 an-1 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 textdtooks. 



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