AMERICAN JOURNAL OF SCIENCE. 



:rd series.] 



Vet. lX.~T-rf.inry ITisiory «f 

 Clarexce E. Duttox, Capta 

 with folio atlas. IT. S. Geological Sui 

 Director. Washington, 1882.'— With 





of the Grand Cafl< 



m of 



the Colorado and 



ons of" river erosio 



!i firs 



it began to be app 



descriptions and v 



iews : 



given in the Report 



under Lieutenant , 



J. c. 



Ives in 1857-58, w 



!,v- 



the Expedit 



which Professor J. S. Newberry was associated as Geologist. 

 Major Powell's Reports and the photographs made by the Ex- 

 pedition under his direction added greatly to our knowledge 

 and appreciation of the facts, making accepted truth of what 

 had seemed to many to be almost beyond belief. 



Captain Brrrox's Report, just now published, still further 



- the features of the region, portraving the magnifi- 

 cence of its various parts by remarkably effective views and 



acture and 



history. In the coarse of the latter the author takes the 



reader on several excursions through the Grand Canon among 



and ridges two to five 



- of feet in height which stand over its bottom and 

 project from its deeply alcoved borders; and gives explana- 

 tions along the way with regard to the peculiar features of the 

 different rocks, the watersculpturiug process, the long and 

 profound faults of the region, the many volcanic cones and 

 outflows, and the era and extent of the great erosion. 



These several topics are further discussed in separate chap- 

 ters, treating of the physical history and evolution of the 

 I - e has been prepared from advance sheets placed in the hands of 



