192 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
"Waltz, Paul — Continued. 
2465. Les geysers d'lxtlan, Michoacan. — X e Congr. geol. intern., Guide des 
Excursions, Mexico, no. XII, 22 pp., 4 pis., 190(3. 
2466. Le volcan de Colima. — X e Congr. geol. intern., Guide des Excursions, 
Mexico, no. XIII, 28 pp., 4 pis., 1 fig., 1906. 
2467. Esquisse geologique et petrographique des environs de Hidalgo del 
Parral.— X e Congr. geol. intern., Guide des Excursions, Mexico, no. XXI, 21 
pp., 5 pis. (incl. geol. map and sections), 1906. 
2468. Algunos experimentos en geyseres artificiales. — Soc. Geol. Mexicana, 
Bol., t. 2, pp. 71-85, 1 pi., 1906. 
Describes experiments with artificial geysers. 
Walcott, Charles D. 
2469. Cooperation of the United States Geological Survey and state mining 
bureaus.— Am. Min. Cong., 8th Ann. Sess., pp. 82-98, 1906; Min. World, vol. 23, 
no. 21, pp. 577-579, November 25, 1905. 
2470. Algonkian formations of northwestern Montana. — Geol. Soc. America, 
Bull., vol. 17, pp. 1-28, 11 pis., 1906. 
Describes and correlates Algonkian sections in Montana. 
2471. Twenty-seventh annual report of the Director of the United States 
Geological Survey to the Secretary of the Interior, 1905-6. Washington, Gov- 
ernment Printing Office, 190(5. 104 pp., 24 pis. (maps). 
Outlines the work of the U. S. Geological Survey during the fiscal year ending June 30, 
1906. 
2472. Principles which govern the United States Geological Survey in its 
relations with other geological surveys and working geologists. — Science, new 
ser., vol. 24, pp. 692-693, November 30, 1906. 
2473. Louis Agassiz. — Smithsonian Misc. Coll., vol. 50 (Quart. Issue, vol. 4, 
pt. 2), pp. 216-218, 1 pi. (port.), 1907. 
Correspondence relating to the survey of the coal fields of Arkansas. — See 
Branner, no. 287. 
The policy of the U. S. Geological Survey and its bearing upon science and 
education. — See Branner, no. 288. 
Walker, T. L. 
2474. [Report on] the Muskoka district. — Canada, Geol. Survey, Summ., 
Rept. for 1905, pp. 84-86, 1906. 
Gives notes upon the geology of the region examined. . « 
Walsh, George E. 
2475. Prospecting for rare metals and earths. — Min. and Sci. Press, vol. 94, 
pp. 218-219, February 16, 1907. 
Includes notes on the occurrence of rare earths. 
Walter, Paul A. E. 
[Physiography and geology of New Mexico]. — See Frost and Walter, no. 902. 
Ward, Henry Baldwin. 
2476. Peculiarities of the "Nebraska man." — Putnam's Monthly, pp. 410- 
413, 3 figs., January, 1907. 
Preliminary report on the primitive man of Nebraska. — See Barbour and 
Ward, no. 142. 
Warner, J. H. 
2477. The Waterloo quartzite.— Min. WOrld, vol. 22, no. 16, pp. 420^22, 
2 figs., April 22, 1905. 
Describes the occurrence and character of pre-Cainbrian strata in southern Wisconsin. 
