ABSTRACTS 



Authors of scientific papers are requested to see that abstracts, preferably 

 prepared and signed by themselves, are forwarded promptly to the editors. 

 Each of the scientific bureaus in Washington has a representative authorized to 

 forward such material to this Journal and abstracts of official publications 

 should be transmitted through the representative of the bureau in which they 

 originate. The abstracts should conform in length and general style to tho.se 

 appearing in this issue. 



GEOLOGY. — Mining developmefits and water-power investigations in 



southeasterji Alaska. Theodore Chapin, H. M. Eakin and G. 



H. Canfield. U. S. Geological Survey Bulletin 662-B. Pp. 92, 



with maps, sections, and illustrations. 1917. 



Contains short papers on the work of 1916, as follows: Mining 



developmepts in the Ketchikan and Wrangell mining districts, by Theodore 



Chapin; Lode mining in the Juneau gold belt, by H. M. Eakin; Gold 



placer mining in the Porcupine district, by H. M. Eakin; Water-power 



investigations in Southeastern Alaska, by G. H. Canfield. 



I • R. W. Stone. 



GEOLOGY. — Mineral springs of Alaska. Gerald A. Waring, with 

 a chapter on the Quality of some surface waters, by Richard B. 

 Dole and Alfred A. Chambers. U. S. Geological Survey 

 Water-Supply Paper 418. Pp. 109, with 9 plates and 16 figures. 

 1917. 

 The report contains a preliminar}^ chapter on the ph5^siography 

 and geology of Alaska by Alfred H. Brooks. The mineral springs are 

 grouped for description into hot, carbonated, sulphur, iron, and salt 

 springs, and individual mention is made of most of the 110 springs 

 whose locations are shown on maps accompanying the report. Anal- 

 yses of a number of the waters are given, and their characters are 

 described briefly in relation to the rock formations through which they 

 issue. 



A number of the stream waters of the Territory were also analysed, 

 and their characters are discussed in a separate chapter, by Richard 

 B. Dole and Alfred A. Chambers. G. A. W. 



171 



