LITERATURE. 15 
1844, 
HovucGuton (DouGLAs). Copper on Lake Superior. Am. Jour. Sci., 1844 (1), xlvii., 
107, 132. 
Locks (JoHN). Geology of Porter’s Island and Copper Harbor. Transactions of the 
American Philosophical Society, 1844, ix., 311, 312, with maps. 
1845. 
JACKSON (CHARLES T.). On the Copper and Silver of Keweenaw Point, Lake Su- 
perior. Am. Jour. Sci., 1845 (1), xlix., 81-93. 
Sur le Gisement de Cuivre et d’Argent natifs des Bords du Lae Supérieur. 
Comptes Rendus, 1845, xx., 593-595; Bulletin de la Société Géologique de 
France, 184445 (2), ii., 317-319. 
SHEPARD (CHARLES U.). On the Copper and Silver of Keweenaw Point, Lake Su- 
perior. Proceedings of the Sixth Annual Meeting of the Association of 
American Geologists and Naturalists, New Haven, 1845, 60, 61. 
1846. 
HovuGHTON (JACOB, JR.), and Bristou (T. W.). Mineral Region of Lake Superior. 
Detroit, 1846, 109 pp. and map. 
JACKSON (CHARLES T.). The Copper and Silver Mines of Lake Superior. Proceedings 
of the Boston Society of Natural History, 1846, ii., 110-114. 
Logan (WILLIAM #.). North Shore of Lake Superior. Geological Survey of Canada, 
Report of Progress, 184647, 5-46. 
RoeeErs (H. D.). Mineralogy and Geology of Lake Superior. Proc. Bost. Soc. Nat. 
Hist., 1846, ii., 124, 125. 
1847. 
Dutton (T. R.). Observations on the Basaltic Formation on the Northern Shore of 
Lake Superior. Am. Jour. Sci. (2), 1847, iv., 118, 119. 
JACKSON (CHARLES T.). Report on the Mineral Lands of Lake Superior. Senate 
Does., 1st sess. 30th Cong., 184748, ii., No. 2, 175-230. 
Ores and Minerals from Lake Superior. Proc. Bost. Soc. Nat. Hist., 1847, ii., 256, 
259, 260. 
LoGawn (WILLIAM B.). Remarks on the Mining Region of Lake Superior, and a Report 
on Mining Locations claimed on the Canadian Shores of the Lake. Montreal, 
1847, 31 pp., with maps. 
MurRRAY (ALEXANDER). North Shore of Lake Superior. Geol. Sury. Canada, Rep. of 
Progress, 1846—47, 47-57. 
1848. 
JACKSON (CHARLES T.). Age of the Lake Superior Sandstone. Proc. Bost. Soc. Nat. 
Hist., 1848, iii., 76, 77. 
ROGERS (WILLIAM B.). On the Origin of the Actual Outlines of Lake Superior. Pro- 
ceedings of the American Association for the Advancement of Science, 1848, 
First Meeting, 79, 80. 
