Geology and Natural History. 329 



lar nature that has previously appeared, and is a valuable and 

 important contribution to the practical side of radio-activity. 



B. B. B. 



17. The Physical Revieic and the American Physical Society. — 

 In July-August, 1893, the Physical Review was started under the 

 auspices of the physical department of Cornell University, and for 

 nearly twenty years it has maintained a high standard and done 

 an important work for the development of physics in this country. 

 With the current number (for January, 1913, recently issued.) 

 the control of the Review has been transferred to the American 

 Physical Society ; a wider scope and greater usefulness thus 

 seems assured to it. 



II. Geology and Natural History. 



1. Publications of the United States Geological Survey / 

 George Otis Smith, Director. — Recent publications of the U. S. 

 Geological Survey are noted in the following list (continued from 

 vol. xxxiv, p. 484) : 



Folio No. 183. — Description of the Llano and Burnet Quad- 

 rangles ; by Sidney Paige. Pp. 16 ; 6 figures, 3 colored maps, 

 11 plates. 



Monograph. — Volume LI, Cambrian Brachiopoda; by Charles 

 D. Walcott. Part I, Text. Pp. 872. Part II, Plates. Pp. 

 363 ; 104 plates. See p. 331. 



Professioval Paper No. 71. — Index to the Sti"atigraphy of 

 North America ; by Bailey Willis. Compiled by the IT. S. 

 Geol. Survey in cooperation with the Geol. Survey of Canada 

 and the Instituto Geologico de Mexico under the supervision of 

 Bailey Willis and George W. Stose. Pp. 894 ; one plate, 

 19 figures, and 5 inserts. Also under separate cover Geologic 

 Map of North America. — See p. 195. 



Mineral Resources of the United States, Calendar Year 1911. 

 Part II. Nonmetals. Pp. 1224; 9 plates, 14 figures. The numer- 

 ous separate chapters, already given to the public, are published 

 together in this massive volume ; the various fuels, clay products, 

 building stones and other substances, not metallic, are included 

 here. 



Advance chapters giving the production of the various metals 

 have also been issued ; also a Summary of the Mineral Produc- 

 tion of the United States in 1911 compiled by W. T. Thom. The 

 usual large sheet, now published, gives in detail the quantity and 

 value of Mineral Products for the years 1902 to 1911 ; this has 

 been prepared by Edw t ard W. Parker, statistician in charge. 

 The total value for all products in 191 1 was nearly $1,920,000,000; 

 this is less than the amount for 1910 by $72,000,000, which is 

 explained almost entirely b\ a decrease in pig iron. 



Bulletins. — No. 471. Contributions to Economic Geology, 

 1910. Part II. Mineral Fuels. Marius R. Campbell, Geologist- 

 in-charge. Pp. 663 ; 62 plates, 15 figures. 



