Geology and Mineralogy. 371 



given mass M in a given unit of time" (p. 150). " . . . and 

 experiment has shown that the velocity acquired at the end of 

 one second of time is 82-1912 feet or more accurately 980-965 

 centimetres" (p. 152). In the single italicised sentence on page 

 268 the names of certain chemical elements are spelled as follows : 

 " phaseodymium, gadolinum, eubium, and luticinm." h. s. u. 



II. Geology and Mineralogy. 



1. Thirty-sixth Annual Report of the Director of the United 

 States Geological Survey to the Secretary of the Interior for the 

 Fiscal Year ended June 30, 1915 ; by George Otis Smith, 

 Director, 1915. — This report is interesting in showing the progress 

 which has taken place in the scope and operations of the Geo- 

 logical Survey during recent years. From being originally an 

 almost purely scientific bureau concerned with the field work of 

 topographic and geologic mapping and the publication of the 

 results in form accessible only to experts, it has developed and 

 organized successive ' divisions such as the Water Resources 

 Branch and Land Classification Board. The latter embraces 

 under the head of " hydrographic classification" such subdivi- 

 sions as water power, irrigation, enlai'ged homesteads, and public 

 water reserves. It is seen that the expanding sphere of the Sur- 

 vey results in a wider usefulness, especially to the people at large. 

 The Director of the Survey recognizes the large educational func- 

 tion which the bureau may fulfill to the non-geological but intelli- 

 gent public. This is shown by his paper given during the year 

 entitled " Plain writing," by a larger amount of official corre- 

 spondence with the general public, by an increased use of non- 

 technical writing in the various reports, by simple explanations 

 given on the backs of topographic sheets, and especially by the 

 very interesting and instructive series of guide books issued dur- 

 ing the year. 



The magnitude of operations for the year is indicated by the 

 summary given under the " division of accounts." The total 

 appropriation for the fiscal year ended June 30, 1915, was 

 $1,405,520.00, but of this only $110,000.00 was appropriated for 

 geologic maps of the United States. j. b. 



2. Publications of the United States Geological Survey, 

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

 Geological Survey are noted in the following list (continued from 

 pp. 519-521, November, 1915) : 



Thirty-sixth Annual Report of the Director for the year ended 

 June 30, 1915. Pp. 186 ; 2 pis. See notice above. 



Topographic Atlas. — Forty-four sheets. 



Folios. — No. 195. Belleville-Breese Folio, Illinois ; by J. A. 

 Udden and E. W. Shaw. Pp. 13, with 5 pp. sections and maps. 



No. 196. Philipsburg Folio, Montana; by F. C. Calkins and 

 W. H. Emmons. Pp. 25, with 5 pp. sections and maps. 



Am. Jour. Sci. — Fourth Series, Vol. XLI, No. 244.— April, 1916. 

 26 



