412 Scientific Intelligence. 



Lebour, F. Drew, and R. Etheridge, Jr., for Descriptive Geology; 

 Professor A. H. Green, for Physical Geology ; F. W. Rudler, for 

 Mineralogy and Petrology ; and L. C. Miall, Prof. H. A. Nicholson, 

 and \y. Carruthers, for Paleontology. The number of works and 

 memoirs mentioned by title is verylarge, and, for much the larger 

 part, short abstracts are given, which appear to have been care- 

 fully prepared. American publications are included, as well as 

 those of other continents, and are judiciously treated. Some 

 omissions we note, of papers in the Publications of Societies. This 

 volume is to be the first of a series of Annual Records, and that 

 for 1875 is already far advanced. 



5. Report on the Geology of a portion of Colorado examined 

 in 1873; by Prof. J. J. Stevenson. 376 pp. 4to. Part IV of 

 Lieut. Wheeler's Survey Report, vol. III. Published March 4, 

 1876.— Prof. Stevenson treats, in his report, of the general physical 

 features of Colorado, of the various rock formations and mineral 

 springs, and of the structure and age of the Rocky Mountain 

 System and brings forward much thatls of interest. Cnder this 

 last head, the new conclusion is advanced that there was an era of 

 mountain-making in the Rocky Mountains at the close of the 

 Carboniferous age, synchronous with that in w^hich the Appa 

 lachians were formed. The facts brought forward in its support 

 appear to us to be too few and from too limited an area to 

 establish fully its truth against the opposing statements of other 

 Rocky Mountain investigators. If an epoch of mouiitain-making 

 then occurred, it ought to be registered in an extensive series of 

 obvious facts. We see in the Appalachians— in their breadth 

 exceeding 100 miles, their length several hundreds, with upturn- 

 ings everywhere — an example of an individual mountain-chain 

 (i. e., one made in a single mountain-making operation) ; and 

 also a display of the manifest evidences of disturbance which 

 such an area should bear. We have, further, an illustration of 

 the fact that such an " individual" cannot have narrow confines, 

 because the crust of the earth has been— certainly since Silurian 

 times— too thick to bend in a narrow trough or geosynclinal (the 

 trough in which the deposits constituting the mountains were 

 accumulated). We shall look with great' interest for the results 

 that may hereafter be published by other observers on this inter- 

 esting question. J. c d. 



6. Ba^ Qebirge urn Hallstatt. Erster Theil ; Die Mollusken- 

 Faunen d. Zlarabach und Ilallstatter-Schichten. II Heft mit 38 

 Lith. Tafeln. Von Edmuxd Mo.t.sisovics von Mojsvar, Chef-Geolo- 

 gen d. k. k. geol, Reichsanstalt. 4to. Vienna, 1875.— This part of 

 the great work on the peculiar fossil fauna of the renowned locality 

 of Hallstatt is worthy of its predecessor previously noticed in this 

 Journal. It contains the most complete series of figures and descrip- 

 tions of the genus Arcestes yet published. Thirty-four plates are 

 devoted to the illustration of this group and the specimens are, 



ost. narf ^rpr^ T.^,^o,.t. This has enabled the author to 

 I of a multitude of various forms all 



