RevieiDs — JSitchcock and BM'e's Map of the United States. 371 



artless natives of the mountains. All these material pieces of in- 

 formation, together with hotels and guides, are carefully recorded 

 by Mr. Ball, to whom our best thanks are due for his very con- 

 venient little series of Alpine Guide-books. 



III. — Geological Map of the United States, compiled for the 

 9th Census, 1872. By 0. H. Hitchcock and W. P. Blake. 



(The base is the Military Map of the United States, by permission of the Chief of 



Engineers.) 



THE Reports of the various State Surveys published from time to 

 time have already made us acquainted, in detail, with the 

 Geology of the Great American Republic, and also with its vast 

 Western Territories, now connected to and rapidly becoming amal- 

 gamated with the raore completely occupied Eastern States by the 

 Great Pacific Railroad. 



It is now more than fifteen years ago since Jules Marcou published 

 his map of parts of North America.^ The numerous publications of 

 Professor Dana, and Professor Rogers's Geological Map of the United 

 States, including British North America,^ and the excellent Canadian 

 Map prepared by Sir William Logan, and exhibited at the 1862 

 Exhibition, as well as those given by Lyell,^ have made us generally 

 acquainted with the broad features of American Geology. Some 

 idea may be formed of the basis upon which the present Map rests 

 when we recall for a moment the rapid progress which has been 

 made in Geological research in America within the past fifteen years, 

 notwithstanding the sad interruption to all such peaceful labours 

 caused by the unhappy struggle between North and South, the 

 recollection of which happily is now rapidly sinking into the limbo 

 of the past. 



The following is a tolerably complete * list of the Surveys now in 

 progress, or which have already made Reports or published Maps, 

 etc., relating to the Geology of the various States and Territories 

 named. 



Alaska Territory, by W. H. Dall. 

 California State, by J. D. Whitney and C. King. 

 Colorado, by Dr. F. V. Hayden. , 



Colorado River, by Lieut. J. C. Ives. 

 Illinois State, by A. H. Worthen. 

 Indiana State, by E. T. Cox. 

 Iowa State, by Dr. C. A. White and R. D. Owen. 



1 Boston, 1853. Zurich, 1858. 



2 Pulilished in Keith Johnston's Physical Atlas, 1855. 



3 Travels in North America, with Geological Observations on the United States, 

 Canada, clc, 1845. 2 vols. Svo.— Second Visit to the United States of North America. 

 2 vols, post Svo. 1st edition 1849, 2nd edition 1850. 



^ Our soni ces of information being limited, we trust our American friends will 

 excuse any important omissions, if such there be. We have confined our list to State 

 Geological Eeports. 



