VIII ADVERTISEMENT. 
160. A Dictionary of Altitudes in the United States (Third Edition), compiled by Henry Gannett. 
1899. 8°. 775 pp. Price 40 cents. 
161. Earthquakes in California in 1898, by Charles D. Perrine, Assistant Astronomer in Charge of 
Earthquake Observations at the Lick Observatory. 1899. 8^. 31pp. 1 pi. Price 5 cents. 
162. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
for the Year 1898, by Fred Boughton Weeks. 1899. 8°. 163 pp. Price 15 cents. 
163. Flora of the Montana Formation, by Frank Hall Knowlton. 1900. 8°. 118 pp. 19 pi. Price 15 
cents. 
164. Reconnaissance in the Bio Grande Coal Fields of Texas, by Thomas Wayland Vaughan, includ- 
ing a Report on Igneous Bocks from the San Carlos Coal Field, by E. C. E. Lord. 1900. 8°. 100 pp. 
11 pi. and maps. Price 20 cents. 
165. Contributions to the Geology of Maine, by Henry S.Williams and Herbert E.Gregory. 1900. 
8°. 212 pp. 14 pi. Price 25 cents. 
166. A Gazetteer of Utah, by Henry Gannett. 1900. 8°. 43 pp. 1 map. Price 15 cents. 
167. Contributions to Chemistry and Mineralogy from the Laboratory of the United States Geolog- 
ical Survey; Frank W. Clarke, Chief Chemist. 1900. 8°. 166 pp. Price 15 cents. 
168. Analyses of Rocks, Laboratory of the United States Geological Survey, 1880 to 1899, tabulated 
by F. W. Clarke, Chief Chemist. 1900. 8°. 308 pp. Price 20 cents. 
169. Altitudes in Alaska, by Henry Gannett. 1900. 8°. 13 pp. Price 5 cents. 
170. Survey of the Boundary Line between Idaho and Montana from the International Boundary to 
the Crest of the Bitterroot Mountains, by Richard Urquhart Goode 1900. 8°. 67 pp. 14 pi. Price 
15 cents. 
171. Boundaries of the United States and of the Several States and Territories, with an Outline of 
the History of all Important Changes of Territory (Second Edition), by Henry Gannett. 1900. 8°. 
142 pp. 53 pi. Price 30 cents. 
172. Bibliography and Index of North American Geology, Paleontology, Petrology, and Mineralogy 
for the Tear 1899, by Fred Boughton Weeks. 1900. 8°. 141 pp. Price 15 cents. 
173. Synopsis of American Fossil Bryozoa, including Bibliography and Synonymy, by John M. 
Nickles and Ray S. Bassler. 1900. 8°. 663 pp. Price 40 cents. 
174. Survey of the Northwestern Boundary of the United States, 1857-1861, by Marcus Baker. 1900. 
8°. 78 pp. 1 pi. Price 10 cents. 
In press : 
175. Triangulation and Spirit Leveling in Indian Territory, by C. H. Fitch. 
176. Some Principles and Methods of Rock Analysis, by W. F. llillebrand. 
In preparation : 
— . Bibliography and Catalogue of the Fossil Vertebrata of North America, by Oliver Perry Hay. 
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 gauging of 
streams and to the methods of utilizing the water resources may be printed in octavo form, not to 
exceed one hundred pages in length and five thousand copies in number; one thousand copies of 
whichshall be for the official use of the Geological Survey, one thousand five hundred copies shall be 
delivered to the Senate, and two thousand five hundred copies shall be delivered to the House of Rep- 
resentatives, for distribution." 
Under this law the following papers have been published : 
1. Pumping Water for Irrigation, by Herbert M. Wilson. 1896. 8°. 57 pp. 9 pi. 
2. Irrigation near Phoenix, Arizona, by Arthur P. Davis. 1897. 8°. 97 pp. 31 pi. 
3. Sewage Irrigation, by George W. Rafter. 1897. 8°. 100 pp. 4 pi. 
4. A Reconnoissance in Southeastern Washington, by Israel Cook Russell. 1897. 8°. 96 pp. 7 pi. 
5. Irrigation Practice on the Great Plains, by Elias Branson Cowgill. 1897. 8°. 39 pp. 12 pi. 
6. Underground Waters of Southwestern Kansas, by Erasmuth Haworth. 1897. 8°. 65 pp. 12 pi. 
7. Seepage Waters of Northern Utah, by Samuel Fortier. 1897. 8°. 50 pp. 3 pi. 
8. Windmills for Irrigation, by E. C. Murphy. 1897. 8°. 49 pp. 8 pi. 
9. Irrigation near Greeley, Colorado, by David Boyd. 1897. 8°. 90 pp. 21 pi. 
10. Irrigation in Mesilla Valley, New Mexico, by F. C. Barker. 1898. 8°. 51pp. 11 pi. 
11. River Heights for 1896, by Arthur P. Davis. 1897. 8°. 100 pp. 
12. Underground Waters of Southeastern Nebraska, by NH. Darton. 1898. 8°. 56 pp. 21 pi. 
13. Irrigation Systems in Texas, by William Ferguson Hutson. 1898. 8°. 07 pp. 10 pi. 
14. New Tests of Pumps and Water-Lifts used in Irrigation, by O.P.Hood. 1898. 8°. 91 pp. lpl. 
15. Operations at River Stations, 1897, Parti. 1898. 8°. 100 pp. 
16. Operations at River Stations, 1897, Part II. 1898. 8°. 101-200 pp. 
17. Irrigation near Bakersfield, California, by C. E. Grunsky. 1898. 8°. 96 pp. 16 pi. 
18. Irrigation near Fresno, California, by C. E. Grunsky. 1898. 8°. 94 pp. 14 pi. 
19. Irrigation near Merced, California, by C. E. Grunsky. 1899. 8°. 59 pp. 11 pi. 
