Geology and Mineralogy. 213 



Volume II deals mainly with the rocks j^ounger than the Mona 

 Complex. The Ordovician rocks are the next most important 

 after those of the Complex. They are described in detail, as are 

 also the later Paleozoic rocks, the Pleistocene glaciation, the 

 origin of the land forms, and the economic resources. Under the 

 latter is described, so far as present conditions allow, the old 

 copper mine of Parj^s Mountain, once the most productive cop- 

 per mine of Europe, which still yields annually a modest amount 

 of copper, obtained, however, from the cupriferous waters that 

 flow from the old, caved-in workings. ad@lph knopf. 



2. Ahriss der Allgemeinen und StraUgraphischen Geologic; 

 by Emanuel Kayser. 2d revised edition. Pp. viii, 460, 212 

 text figs., 54 plates of fossils, 1 large geologic map, Stuttgart 

 (Ferdinand Enke), 1920. — Professor Kayser, formerly of the 

 IJniversity of Marburg, and now at Miuiich, is the author of the 

 widely used "Allgemeine Geologic," and "Geologische Forma- 

 tionskunde." These books have become too detailed for under- 

 graduates, and in the present "Abriss, " now in its second edi- 

 tion, he has presented the earth sciences for this class of students. 

 Less than one-half of the text (195 pages) is devoted to physical 

 geology, while the greater part (224 pages) deals with historical 

 geology. We see therefore that in Germany historical geology is 

 held to be equally as important as dynamic and structural geol- 

 ogy, a viewpoint far less popular in this country. The book has 

 an excellent geologic map of central Europe, and is a good volume 

 for American teachers to have on their shelves. c. s. 



3. The Geology and Mineral Resources of Bexar County ; by 

 E. H. Sellards. Univ. of Texas Bull., No. 1932, pp. 169, 1 pi., 

 1 map, 6 text figs., 1919 (1920). — This report treats at length of 

 the geologic and economic resources of the Lower and Upper 

 Cretaceous and Cenozoic formations, having together a thickness 

 of over 4,800 feet. They rest upon ancient schists. The out- 

 crops of the formations are mapped. c. s. 



4. The Geology of Tarrant County ; by W. M. Winton and 

 W. S. Adkins. Univ. of Texas BuJL, No. 1931, pp. 122, 6 pis., 2 

 maps, 6 text figs., 1919 (1920). — Here is described and mapped 

 the geology of the Fort AVorth area, the surface strata being in 

 the main of the Lower Cretaceous. The various formations are 

 discussed in considerable detail, with lists of their characteristic 

 fossils. c. s. 



5. Mineralogy : an Introduction to the Study of Minerals 

 and Crystals; by E. H. Kraus and W. F. Hunt. Pp. 561, 696 

 figs, in the text. McGraw-Hill Book Co.. 1920.— This latest addi- 

 tion to the list of elementary mineralogies has many features that 

 will commend it to the instructor of mineralogy. It covers all 

 the different branches of the field, is concise and well written, 

 and on the whole is unusually well illustrated. A novel and 

 attractive feature is the inclusion of a number of photographs 

 of eminent mineralogists with added brief biographical state- 

 ments. These serve to give an historical perspective to the sub- 

 ject that is as pleasing as it is unusual. 



