398 Scientific Intelligence. 



of the Survey and its promise of great economic usefulness for 

 the future are alike noteworthy. In the present volume we find 

 not only the results of drainage measurements ior prominent 

 rivers over the whole extent of the country, but also the survey 

 of reservoir sites and the discussion of conditions governing under- 

 ground waters as reached for example by artesian wells, both the 

 latter subjects of peculiar interest in the West. The discharge 

 data are given with much fullness for a large number of rivers 

 from Maine to California, and the results are presented in graph- 

 ical form for the successive months of the year. In addition to 

 the statistical matter, plans are presented whereby the limited 

 water supply of certain arid districts and Indian Reservations 

 may be more economically distributed. The closing portion of 

 the volume gives the results of the investigations on the hydrog- 

 raphy of Nicaragua made by Mr. Davis in 1898 ; the work was 

 carried on in connection with the Nicaragua Canal Commission. 



Part V. Forest Reserves; by Henry Gannett. Pp. 1-478, 

 plates i-clix, in part folded maps. The forest reserves of the 

 United States numbered 37 on July 1, 1899, and are distributed 

 over eleven States. The general condition of these reserves is 

 given in this report, and there are also special papers on the fol- 

 lowing districts : Pikes Peak, Plum Creek and South Platte 

 Reserves, by John G. Jack : White River Plateau and Battlement 

 Mesa Reserves, by George B. Sudworth ; Flathead Reserve, by 

 H. B. Ayres ; Bitterroot, San Gabriel, San Bernardino and San 

 Jacinto Reserves, by John B. Leiberg. 



Part VII. Explorations in Alaska 1898. Pp. 494, with maps 

 1-25 and plates i-xxxviii. In this volume are grouped the 

 reports of G. H. Eldridge, J. E. Spurr, W. C. Mendenhall, F. C. 

 Schrader and A. H. Brooks, on reconnaissance surveys in Western 

 and Central Alaska. Besides the sketches of theoretical and 

 economic geology much information is given regarding products, 

 climate and feasible routes. Maps and routes of previous 

 explorers are discussed and the general geographic knowledge of 

 the region is brought down to date. Taken in connection with 

 the "Map of Alaska" (U. S. G. S. 1898) and Schrader and Brooks, 

 "Preliminary Report on the Cape Nome Gold Region" (U. S. G. 

 S. 1900), this volume stands as the reference book for recent 

 reliable information regarding Alaskan matters. 



2. Department of Geology and Natural Resources of Indiana,. 

 24th Annual Rep>ort, 1899/ by W. S. Blatchley, State Geolo- 

 gist. Indianapolis, 1900. Pp. 1-1078, 89 plates. — This report 

 contains more than the ordinary Geological Annual Report. Six 

 of the papers are concerning the Geology of the State. The 

 first, by the Director, refers to the Natural Resources, and three 

 others contain the reports of the State Inspector of Mines, the 

 State Supervisor of Natural Gas, and the State Supervisor of Oil 

 Inspection, respectively. Mr. Foerste contributes a discussion on 

 the Middle Silurian rocks of the Cincinnati anticlinal region, the 

 particular interest of which lies in his interpretation of the 



