ADVERTISEMENT. VII 



147. Earthquakes in California in 1895, by Charles D. Perrine, Assistant Astronomer in Charge 

 of Earthquake Observations at the Lick Observatory. 1896. 8 C '. 23 pp. Price 5 cents. 



148. Analyses of Rocks, with a Chapter on Analytical Methods, Laboratory of the United States 

 Geological Survev, 1880 to 1896, by F. W. Clarke and \V. F. Hillebrand. 1897! 8°. 306 pp. Price 

 20 cents. 



149. Bibliography and Index of North American Geology, Paleontology, Petrology, and Miner- 

 alogy for the Year 1896, by Fred Boughton Weeks. 1897. 8°. 152 pp. Price 15 cents. 



In preparation: 



88. The Cretaceous Foraminifera of New Jersey, by Rufus Mather Bagg, jr. 



150. The Educational Series of Rock Specimens Collected and Distributed by the United States 

 Geological Survey, by Joseph Silas Diller. 



151. The Lower Cretaceous Grypha-as of the Texas Region, by R. T. Hill and T. Wayland 

 Vaughan. 



89. Some Trachandesite Flows of the Western Slope of the Sierra Nevada, California, by 

 F. Leslie Ransome. 



WATER SUPPLY AND IRRIGATION PAPERS. 



By act of Congress approved June 11, 1896, the following provision was made: 

 "Provided, That hereafter the reports of the Geological Survey in relation to the gaugino- of 

 streams and to the methods of utilizing the water resources may be prin ed in octavo formf no't to 

 exceed one hundred pages in length and five thousand copies in number; one thousand copies of which 

 shall be for the official use of the Geological Survey, one thousand five hundred copies shall be deliv- 

 ered to the Senate, and two thousand five hundred copies shall be delivered to the House of Repre- 

 sentatives, for distribution.'' 



Under this law the following paper has been issued : 



1. Pumping Water for Irrigation, by Herbert M. Wilson. 1896. 8 C . 57 pp. 



2. Irrigation near Phienix, Arizona, by Arthur P. Davis. 1897. 8°. 97 pp. 



3. Sewage Irrigation, by George W. Rafter. 1897. 8°. 100 pp. 



4. A Reconnoissance in Southeastern Washington, by Israel Cook Russell. 1897. 8°. 96 pp. 



5. Irrigation Practice on the Great Plains, by Elias Branson Cowgill. 1897. 8°. 39 pp. 



6. Underground Waters of Southwestern Kansas, by Erasmus Haworth. 1897. 8°. 65 pp. 



7. Seepage Waters of Northern Utah, by Samuel Fortier. 1897. 8°. 50 pp. 



8. Windmills lor Irrigation, by Edward Charles Murphy. 1897. 8°. 49 pp. 



9. Irrigation near Greeley, Colorado, by David Boyd. 1897. 8 C . 90 pp. 



11. River Heights for 1896, by Arthur P. Davis. 1897. 8°. 100 pp. 

 In press : 



10. Irrigation in Mesilla Valley, New Mexico, by F. C. Barker. 

 In preparation : 



12. Water Resources of Southeastern Nebraska, by Nelson H. Darton. 



13. Irrigation Systems in Texas, by William Ferguson Hutson. 



14. New Tests of Certain Pumps and Water-lifts used in Irrigation, by Ozni P. Hood. 



15. Operations at River Stations, 1897, Part I. 



16. Operations at River Stations, 1897, Part II. 



— Water Resources of the Devils Lake region, North Dakota, by Earle J. Babcock. 



— Irrigation in the upper portion of San Joaquin Valley, by C. E. Grunsky. 



— Irrigation in San Bernardino Valley, by J. B. Lippincott. 



— Well Waters of Nebraska, by Edwin H. Barbour. 



— Sewage Irrigation in the United States, by Geo. W. Rafter. 



— Wells of Indiana, by Frank Leverett. 



— Ground Waters and Irrigation, by F. H. King. 



— Deep Wells of Ohio, by Edward Orton. 



— Water Powers of New England, by D wight Porter. 



— Water Power of New York, by Geo. W. Rafter. 



— Average Discharge of Rivers, by F. H. Newell. 



— Overflow of Arkansas Valley, by Willard D Johnson. 



TOPOGRAPHIC MAP OF THE UNITED STATES. 



When, in 1882, the Geological Survey was directed by law to make a geologic map of the United 

 States there was in existence no suitable topographic map to serve as a base for the geologic map. 

 The preparation of such a topographic map was therefore immediately begun. About one-fifth of the 

 area of the country, excluding Alaska, has now been thus mapped. The map is published in atlas 

 sheets, each sheet representing a small quadrangular district, as explained under the following head- 

 ing. The separate sheets are sold at 5 cents each when fewer than 100 copies are purchased, but when 

 they are ordered in lots of 100 or more copies, whether of the same sheet or of different sheets, the 

 price is 2 cents each. The mapped areas are widely scattered, nearly every State being represented. 

 More than 800 sheets have been engraved aud printed ; they are tabulated* by States in the Survey's 

 "List of Publications,'' a pamphlet which may be had on application. 

 MON XXX 14 



