4tQS Scientific Intelligence. 



ogy ' will be to furnish its readers with articles of a scientific 

 character. These will deal with the application of the broad 

 principles of geology to mineral deposits of economic value, with 

 the scientific description of such deposits and particularly with 

 the chemical, physical and structural problems bearing upon their 

 genesis. With the engineering and commercial aspects of min- 

 ing this journal will not be directly concerned, as these subjects 

 find ample representation in the technical mining journals." 



The editor of "Economic Geology" is Prof. J. D. Irving of 

 Lehigh University, and the associate editors ; Mr. W. Lindgren 

 of Washington, Prof. J. F. Kemp of Columbia University, Mr. 

 F. L. Ransome of Washington, Prof. H. Pies of Cornell Uni- 

 versity, Mr. M. R. Campbell of Washington and Prof. C. K. 

 Leith of the University of Wisconsin. 



The magazine in its mechanical make-up has evidently been 

 modeled after the Journal of Geology. The paper, type, and 

 general appearance are all excellent. The first number embraces 

 100 pages, of which about three-fourths are given to articles, 

 whose titles are as follows : The Present Standing of Applied 

 Geology, by F. L. Ransome; Secondary Enrichment in Ore- 

 Deposits of Copper, by J. F. Kemp ; Hypothesis to Account for 

 the Transformation of Vegetable Matter into the Different Vari- 

 eties of Coal, by M. R. Campbell; Ore-Deposition and Deep Min- 

 ing, by W. Lindgren ; Genesis of the Lake Superior Iron Ores, by 

 C. K. Leith ; The Chemistry of Ore-Deposition — Precipitation of 

 Copper by Natural Silicates, by E. C. Sullivan. There are also 

 sections devoted to the informal discussion of topics relating to 

 economic geology, to reviews and to scientific notes and news. 



w. E. Y. 



8. Minerals in Hock Sections/ the practical methods of identi- 

 fying Minerals in Rock Sections by means of the Microscope ; 

 by Lea McI. Luquer. Revised Edition. 147 pp. New York, 

 1905 (D. Van Nostrand Co.). — The additions and changes intro- 

 duced in the revised edition of this useful volume (see vol. vii, 

 319) are numerous and such as to materially increase its value 

 for the practical worker with the microscope. 



III. Miscellaneous Scientific Intelligence. 



1. National Academy of Sciences. — The autumn meeting of 

 the National Academy was held at New Haven, Conn., on 

 November 14 and 15. The following list contains the titles of 

 papers read : 



John Trowbridge : Slow movements of electrical discharges. 



E. B. Wilson : Sex-determinations and the chromosomes. 



L. B. Mendel : Studies on the chemical physiology of development and 

 growth. 



W. M. Davis : The Dwyka glacial conglomerate of South Africa. 



B. B. Bolt wood : The disintegration products of thorium as indicated by 

 the proportions of lead and helium in minerals. 



