Geology. 595 



in the Jackson-Mason-Putnam county reports to features of eco- 

 nomic interest. The chapter on soils (pp. 297-354) is sufficiently 

 detailed to be of direct use to agriculturists ; numerous oil and 

 gas well records are given (pp. 200-246) and coal resources are 

 studied in detail both as regards geological occurrence and the 

 present state of the industry. In this connection the contour 

 map of the surface of the Pittsburg Coal is of special interest. 

 The geological map exhibits in a striking way the abandoned 

 Teays valley and its relations to the Kanawha and Ohio valleys. 



H. E. G. 



8. Wisconsin Geological and Natural History Survey ; E. 

 A. Birge, Director. Bulletin No. NNIV, Soil Series No. 1. 

 1911. Reconnoissance Soil Survey of Mari7wtte County, by 

 Samuel Weidman and Percy O. Wood. Pp. 44 ; 1 map, 4 

 plates, 1 figure. — In common with Bulletin XXXIII (this Jour- 

 nal, xxxiii, 382), the Soil Survey of Marinette county contains 

 interesting geographic material, as well as data and recommenda- 

 tions of special interest to agriculturists. h. e. g. 



9. Building Stones and Clays: their Origin, Characters and 

 Examination ; by Edwin C. Eckel. Pp. 264 ; 37 figures. New 

 York, 1912 (John Wiley & Sons). — Most texts on economic 

 geology include, with the strictly economic discussions, consider- 

 able matter better presented in standard texts covering a wider 

 range of topics. The present book retains this characteristic of 

 its class, and although designed to be of direct use to stone- and 

 clay-working interests, yet several chapters in it might well form 

 part of a general text-book for classes in elementary geology. 

 Mr. Eckel has, however, succeeded better than most writers in 

 separating " practical" discussions from matters of scientific 

 interest, even calling attention to the uselessness of chemical 

 analyses as tests for certain structural materials. The most dis- 

 tinctive features of the book, — the parts which amply justify its 

 existence — are chapters on Field Examination and Valuation of 

 Stone Properties, the Laboratory Testing of Stone, and Field 

 Examination of Clay Properties. Rather full lists of references 

 are given, — lists which would be of more use if classified accord- 

 ing to quality or method of treatment. The object of including 

 many pages of statistics of production for 1909 is not apparent. 



H. E. G. 



10. Mineralogy; by F. H. Hatch. Fourth Edition. Pp.253; 

 124 illustrations. London and New York (Whittaker & Co., 

 1912). — In this fourth edition the author has rewritten and en- 

 larged the volume first issued in 1892. The subject is briefly but 

 clearly presented, the species described being, first, those impor- 

 tant in rock formation; second, the ores of the prominent metals; 

 third, the salts and useful minerals other than ores; fourth, gems. 

 The introductory chapters discuss the general morphological, 

 physical, and chemical properties of minerals. 



