Geology and Natural History. 195 



E. O. Ulrich, Stuart Weller, H. S. Williams, Carl Wiman, and 

 the immediate distribution list of the Survey, which includes 

 about twenty-five scientific magazines, institutions, etc, This 

 preliminary distribution was merely for the purpose of fixing 

 the date of publication (December 28, 1912) within the calendar 

 year which appears on the title pages of the volumes, something 

 which might not have happened if the entire sendings had been 

 allowed to go forward in the usual way. 



LANCASTER D. BURLING. 



2. Index to the Stratigraphy of North America ; by Bailey 

 Willis. Prof. Paper 11, U. S. Geol. Surv., 894 pages, 19 text 

 figs.; accompanied (in separate case) by a geologic map of North 

 America compiled by the U. S. Geological Survey in cooperation 

 with the Geological Survey of Canada and the Instituto Geologico 

 de Mexico, under the supervision of Bailey Willis and G. W. Stose, 

 1912. — This very important publication is particularly valuable 

 for the accompanying geologic map of North America in four 

 sheets, making a wall map 60 xV7 inches. The geology on this 

 map is shown in 42 colors, 1 of which gives the distribution of 

 Quaternary formations, 9 Cenozoic, 8 Mesozoic, 11 Paleozoic, and 

 13 pre-Paleozoic. In addition there are in the text 18 sketch 

 maps giving the areal distribution of the combined formations of 

 a system, along with the key to references in the text where con- 

 siderable of the local geology is described. This map will be of 

 the greatest service to American geologists, and is indispensable 

 to all teachers of geology. Its color scheme is so arranged that 

 the major features of the continent are apparent at a distance, 

 while the detail is readily discernible on closer view. 



The Index to the Stratigraphy of North America is a compi- 

 lation designed to explain the geologic map. The compiler, Mr. 

 Willis, "has assembled the latest or most authoritative statements 

 of fact and opinion, selected according to his best judgment. . . . 

 The material selected comprises discussions of stratigraphy, some 

 citations of fossils, and some views on correlation. The aim has 

 been to state stratigraphic facts as fully as the data available or 

 the scope of the work permit, and to include as much as space 

 allows relating to faunas and correlation. Quotation is preferred, 

 but where it was not practicable an abstract of facts has been 

 made and the reference given." 



The work was a most difficult and laborious undertaking, and 

 the thanks of all geologists are due to Mr. Willis and Mr. Stose. 



c. s. 



3. Lehrbuch der Paldozoologie. I: Wirhellose Tiere ; II: 

 Wirbeltiere ; by E. Stromer von Reichenbach. Pages 342 and 

 325, figs. 398 and 234. Leipzig and Berlin, 1909-1912.— This 

 text-book of paleontology is now completed. It is replete with 

 excellent illustrations, most of which are redrawn from many dif- 

 ferent sources, and the printing is of the best. The material is 

 handled from the standpoint of classes, subclasses, and orders, all 

 of which are briefly defined and the essential characters pointed 



