144 



BULLETIN OF TIIK 



Hughes, G. W. 



The Working of Copper Ore. Senate Docs., 1st Scss. 28tli Cong., 1843 ~ 44, 



v., No. 291, 58 pp. 



Hunt, T. Sterry. 



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



417, 418. 

 Ou some Points iti American Geology. Am. Jour. Sci., 1861, xxxi. 392- 



414; Canadian Nat and GeoL, 18G1, vi. 81-105. 

 Contributions to Lithology. Am. Jour. Sci., 1SG4, (2,) xxxvii. 248--20G; 



xxxviii. 91-104, 174-185. 

 The Origin of Metalliferous Deposits. Trans. Am. Inst. MIn. Eng., 1872, 



i. 413-426. 

 The Gcognostlcal History of tlie Metals. Trans. Am. Inst. Min. Eng., 1873, 



i. 331-336. 



Geognosy of tlie Appalachians and the Origin of Crystalline llocks. Proc. 



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

 The Geology of the North Sliore of Lake Superior. (Supplementary Note.) 



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

 Chemical and Geological Essays. r>oston, 1874, 489 pp. Hevised Edition, 



Salem, 1878. 

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



82-94. 

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



253 pp. 

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



Eng., lS79,vii. 333-336, 339. 

 The History of some Pre-Cambrian llocks 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 pi the Copper-bearing llocks of Ln.kc Superior; and on ilie 

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



1874, (3,) viii. 46-56. 

 Nolo oa the Age of tlic CryslalUne Pocks of Wisconsin. Am. Jonr. Sci., 



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



Note on tkc Stratigraphy of the Iluronian Scries of Northern Wisconsin; 

 and on the Equivalency of the Iluronian of the M.arquette and Penokee Dis- 

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



See T. C. Chamberlain. 



Jackson, Charles T. 



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



1845, ii. 57, 58. 



1^ 



