224 Scientific Intelligence. 



many anticlinal lines not heretofore shown. It includes also 

 booklet giving the names and post-office addresses of all the 

 principal coal mining operators in West Virginia up to July 1st, 

 1921. Scale, 8 miles to the inch. Price, folded in strong enve- 

 lope and delivered by mail, $1.00 ; 6 copies for $5.00. 



A Soil Survey of Fayette County has also been issued by the 

 Geological Survey in co-operation with the U. S. Department of 

 Agriculture; this is by J. A. Kerr, and contains a large Soil 

 map on a scale of 1/62,500 ; contour interval 50 feet. 



7. Virginia Geological Survey; Thomas L. Watson, Direc- 

 tor. Charlottesville, 1921.— Bulletin XXI (pp. 224; with 18 

 plates and 21 text figures) . This is by Albert W. Giles and dis- 

 cusses the geology and coal resources of Dickenson County. 



8. Wisconsin Geological and Natural History Survey ; W. O. 

 Hotchkiss, Director. Madison, Wisconsin, 1921. — Bulletin 58 

 (pp. 252, with 2 maps and 93 text figures) is by R. H. Witbeck 

 and describes the geopraphy and economic development of South- 

 eastern Wisconsin. 



9. Dana's Textbook of Mineralogy. Third Edition; by 

 William E. Ford. Pp. ix, 720, with 1,050 text figures. New 

 York, 1922 (John Wiley and Sons). — After an interval of nearly 

 twenty-four years a third edition of the Textbook has been pub- 

 lished, the task of revision and of incorporating the advances in 

 mineralogy during the past two decades having been undertaken 

 by Professor Ford. The general character of the book has been 

 retained, but the addition of the new matter required to bring the 

 book abreast of the times has necessitated lengthening it by 127 

 pages. In spite of this increase in the number of pages, the 

 actual bulk of the new volume does not exceed that of the former 

 edition, owing to the thinner and better paper employed. 



In the section on Crystallography the methods of stereographic 

 and gnomonic projection have been introduced. Much of the 

 section on Optical Characters of Minerals, long recognized as the 

 best concise, adequate presentation of this subject in English, has 

 been rewritten, expanded, and brought into closer relation with 

 the actual working methods of microscopical technique. The 

 many excellent figures added here should do much to render the 

 subject matter more easily assimilable by the student. 



In the part on Descriptive Mineralogy the reactions in polished 

 sections of many of the opaque minerals are given. All species 

 newly recognized since the previous edition are briefly mentioned 

 in their proper places. The largely increased amount of optical 

 data given for the various minerals reflects the greatly enhanced 

 importance that the immersion method of determining minerals 

 has assumed in recent years. The great wealth of information 

 concisely presented in the new edition makes it an exceedingly 

 valuable compendium of mineralogy. adolph knopf. 



