144 BULLETIN OF THE 



Hughes, G. W. 



Tlic AVorkiiii? of Copper Ore. Senate Docs., 1st Sess. 2Stli Cong., 1843 - 44, 

 v., No. 291, 58 i)p. 



Hunt, T. Sterry. 



On some Ores of Nickel from Lake Superior. Am. Jour. Sci., 1855, (2,) xix. 



417, 418. 

 On some Points in American Geology. Am. Jour. Sci., 1861, xxxi. 392- 



414; Canadian Nat and Geol., 1861, vi. 81-105. 

 Contributions to Lithology. Am. Jour. Sci., 1864, (2,) xxxvii. 248 - 266 ; 



xxxviii. 91-104, 174-185. 

 The Origin of Metalliferous Deposits. Trans. Am. Inst. Min. Eug., 1872, 



i. 413-426. 

 The Geognostical History of the Metals. Trans. Am. Inst. Min. Eng., 1873, 



i. 331-336. 

 Geognosy of the Appalachians and the Origin of Crystalline Rocks. Proc. 



Am. Assoc. Adv. Sci., 1871, xx. 1-59. 

 The Geology of the Nortli Shore of Lake Superior. (Supplementary Note.) 



Trans. Am. Inst. Min. Eng., 1873, ii. 58, 59. 

 Chemical and Geological Essays. Boston, 1874, 489 pp. Revised Edition, 



Salem, 1878. 

 The Development of Our Mineral Resources. Harper's Magazine, 1875, li. 



82-94. 

 Azoic Rocks, Part I., 1878. Second Geological Survey of Pennsylvania. E, 



253 pp. 

 The Lake Superior Copper Rocks in Pennsylvania. Trans. Am. Inst. Min. 



Eng., 1879, vii. 333-336, 339. 

 The History of some Pre-Cambriau Rocks in America and Europe. Am. Jour. 



Sci., 1880, (3,) xix. 268-283. 

 See T. C. Chamberlain and W. E. Logan. 



Irving, Roland D. 



On some Points in the Geology of Northern Wisconsin. Trans. Wise. Acad. 



Sci., 1873-74, ii. 107-119. 

 On the Age of the Copper-bearing Rocks of Lake Superior ; and on the 



Westward Continuation of the Lake Superior Synclinal. Am. Jour. Sci., 



1874, (3,) \-iii. 46-56. 

 Note on the Age of the Crystalline Rocks of Wisconsin. Am. Jour. Sci., 



1877, (3,) xiii. 307-309. 

 Note on the Stratigraphy of the Hurouian Series of Northern Wisconsin ; 



and on the Equivalency of the Hurouian of the Marquette and Penokee Dis- 



Iricts. Am. Jour. Sci., 1879, (3,) xvii. 393-398. 

 See T. C. Chamberlain. 



Jackson, Charles T. 



Minerals from Lake Superior. Proc. Bost. Soc. Nat. Hist., 1844, i. 203 ; 

 1845, ii. 57, 58. • 



