40 PROCEEDINGS OF THE PHILADELPHIA MEETING 



Froudescent hematite. Am. Geol., vol. xi, pp. 20-21. 1893. 



The unit of geological mapping for State siuneys. Am. Geol., vol. xi, 



pp. 44-47. 1893. 

 The topographical work of the United States Geological Survey. Am. 



Geol., vol. xi, pp. 47-.jr). 1893. 

 The Illinois State Museum. Am. Geol., vol. xi, pp. 109-110. 1893. 

 I'rofessor Wright's book a service to science. Am. Geol., vol. xi, p. 194. 



1893. 

 I'rehistoric America, by Stephen D. Peet. (A review.) Am. Geol., vol. 



xi, pp. 349-352. 1893. 

 Northwestern Columbian Museum (late the Minneapolis Exposition). 



A circular prepared and printed at Chicago, Nov., 1893. 

 The twenty-lirst annual report of the Geological and Natural History 



Survey of Minnesota for 1892. 171 pp. 8vo; 2 plates, 10 figures. 



Minneapolis, 1893. This report contains : 



Summary statement and comparative nomenclature, pp. 1-4. 

 Field observations of N. H. Winchell in 1892, pp. 79-160. 

 Sponges, graptolites, and corals from the Lower Silurian in Minnesota 



(with Charles Schuchert). Advance pages from "The Geology of 



Minnesota," volume iii, of the final report of the Geological and Nat- 

 ural History Survey of Minnesota, pp. 55-59. Minneapolis, 1893. 

 The Lower Silurian brachiopoda of Minnesota (with Charles Schu- 

 chert). Advance pages from "The Geology of Minnesota," volume iii, 



of the final report of the Geological and Natural History Survey of 



Minnesota, pp. 333-474. Minneapolis, 1893. 

 Report of the State Board of Geological Survey (Michigan) for the 



years 1891 and 1892. 192 pp. 8vo. Lansing, 1892. (A review.) Am. 



Geol., vol. xi, pp. 344-349. 1893. 

 1894. The twenty-second annual report of the Geological and Natural History 



Survey of Minnesota for 1893. 210 pp. 8vo ; 7 plates. Minneapolis, 



1894. This report contains : 



List of rock samples (with geological notes), pp. 5-17. 

 The exhibit of the Survej' at the Columbian Exposition, pp. 201- 

 202. 

 Increase Allen Jjapham. Am. Geol., vol. xiii, pp. 1-38. 1894. 

 Pebbles of clay in stratified gravel and sand. Glacialists' Magazine, 



vol. i, pp. 171-174. 1894. 

 Artesian water supply for Minneapolis ; letter to the City Council. 



Saturday Spectator, Aug. 12, 1894. 5 pp. 

 L'extension du systeme Taconique vers I'ouest. Congres Geologique 



Intern., 1894, pp. 272-308. 

 The Columbian Exposition. The crystalline rocks. Am. Geol., vol. xiv, 



pp. 46-47. 1894. 

 The mineral industry. Am. Geol., vol. xiv, pp. 185-187. 1894. 

 The origin of spheroidal basalt. Am. Geol., vol. xiv, pp. 321-326. 1894. 

 A sketch of geological investigation in Minnesota. Jour. Geol., vol. ii, 



pp. 692-707. 1894. 

 Sketch of John Locke. Am. Geol., vol. xiv, pp. 341-356. 1894. 

 A new meteorite : Minnesota No. 1. Am. Geol., vol. xiv, p. 389. 1894. 



