LITERATURE. 23 
SPENCER (JOSEPH WILLIAM). On the Nipigon or Copper-bearing Rocks of Lake 
Superior, with Notes on Copper Mining in that Region. Canadian Nat., 1878 
(2), vili., 55-81. 
1879. 
HALL (C. W.). Field Report. In Seventh Annual Report of the Geological and Natu- 
ral History Survey of Minnesota for the year 1878, 26-29. 
Irvine (R. D.). Note on the Stratigraphy of the Huronian Series of Northern Wiscon- 
sin; and on the Equivalency of the Huronian of the Marquette and Penokee 
Districts. Am. Jour. Sci., 1879 (3), xvii., 393-398. 
MACFARLANE (THOMAS). Remarks on Canadian Stratigraphy. Canadian Nat., 1879 
(2), ix., 91-102. 
Moser (CuR.). Der Kupferbergbau am Obern See in Nordamerika. Zeitschrift fiir 
das Berg- Hiitten- und Salinenwesen, 1877. Abhandlungen, xxy., 203-221; 
1879, xxvii., 77-97. 
SELWYN (ALFRED R.C.). The Stratigraphy of the Quebec Group and the Older Crys- 
talline Rocks of Canada. Canadian Nat., 1879 (2), ix., 17-32. 
WINCHELL (N. H.). Sketch of the Work of the Season of 1878. In the Seventh An- 
nual Report of the Geol. and Nat. Hist. Survey of Minnesota for the year 
1878, 9-26. 
1880. 
CHAMBERLIN (T. C.) and StrronG (MossEs). Geology of the Upper Saint Croix District. 
Geology of Wisconsin, iii., 1880, 363-428. 
HALL (C. W.). Report of Professor C. W. Hall. In Eighth Annual Report of the 
Geol. and Nat. Hist., Survey of Minnesota for the year 1879, 126-138. 
Hunt (T. StERRY). The History of Some Pre-Cambrian Rocks in America and Europe. 
Am. Jour. Sci., 1880 (3), xix., 268-283. 
Irvine (R. D.). Geological Structure of Northern Wisconsin, with maps. Geol. of 
Wisconsin, iii., 1880, Part I., 1-25. 
Geology of the Eastern Lake Superior District, with atlas maps, and plates. 
Geol. of Wisconsin, Part IIT, 1880, iii., 51-238. 
JULIEN (ALEXIS A.). Microscopical Examination of Eleven Rocks from Ashland Co., 
Wisconsin. Geol. of Wisconsin, iii., 224-238. 
PUMPELLY (RAPHAEL). Lithology of the Keweenawan System. Geol. of Wisconsin, 
iii., Part I., 27-49. 
SWEET (EH. T.). Geology of the Western Lake Superior District, with maps. Geol. of 
Wisconsin, iii., 503-362. 
WaApbswortH (M. E.). Notes on the Iron and Copper Districts of Lake Superior. 
Bulletin of the Museum of Comparative Zoology at Harvard College. Whole 
series, vii., Geological series, i., No. I. 157 pp. 
WINCHELL (N. H.). The Cupriferous Series at Duluth. In the Highth Annual Report 
of the Geol. and Nat. Hist. Survey of Minnesota, for the year 1879, 22-26. 
1881. 
WINCHELL (N. H.). Preliminary List of Rocks. In the Ninth Ann. Rep. of the Geol. 
and Nat. Hist. Surv. of Minnesota for the year 1880, 10-114. 
