[38] A. D. Carmichael, U. S. patent No. 705,904, July 29, 1902. [39] _Metallurgie_, 1905, II, i, 1-6; _Engineering and Mining Journal_, Sept. 2, 1905. [40] _Metallurgie_, 1905, II, 19; _Engineering and Mining Journal_, Jan. 27, 1906. [41] _Metallurgie_, 1905, Sept. 22, 1905; _Engineering and Mining Journal_, March 10, 1906. [42] _Engineering and Mining Journal_, Oct. 21, 1905. [43] Translated by W. R. Ingalls. [44] As originally published the title of this article was “Lead-Smelting without Fuel.” In this connection reference may well be made to Hannay’s experiments and theories, _Transactions_ Institution of Mining and Metallurgy, II, 188, and Huntington’s discussion, _ibid._, p. 217. [45] Excerpt from a paper, “Concrete in Mining and Metallurgical Engineering,” _Transactions_ American Institute of Mining Engineers, XXXV (1905), p. 60. [46] A Discussion of the Paper by Henry W. Edwards, on “Concrete in Mining and Metallurgical Engineering,” _Transactions_ of the American Institute of Mining Engineers, XXXV. [47] _Engineering News_, Nov 30, 1899, and U. S. Patent No. 665,250, Jan. 1 1901. [48] A discussion of the paper of Henry W. Edwards, on “Concrete in Mining and Metallurgical Engineering,” _Transactions_ of the American Institute of Mining Engineers, XXXV. [49] Abstract from the _Journal_ of the Chemical, Metallurgical and Mining Society of South Africa, May, 1903. [50] Abstract of a paper in _Transactions_ American Institute of Mining Engineers, XXXIV (1904), p. 175. [51] Silver not given. This was the case, also, with the gold in the bullion. The slimes contained 0.131 per cent. of gold, or 39.1 oz. per ton. [52] A constituent company of the American Smelting and Refining Company. [53] Translated from _Zeit. f. Berg.-Hütten.-und Salinenwesen im preuss. Staate_, 1905, LIII, p. 433. [54] Abstract from a paper in _Zeit. f. Berg.-Hütten-und Salinenwesen im preuss. Staate_, 1905, LIII, p. 439. [55] Translated from _Zeit. f. Berg.-Hütten.-und Salinenwesen im preuss. Staate_, 1905, LIII, 490. [56] Abstract from a paper in _Zeit. f. Berg.-Hütten-und Salinenwesen im preuss. Staate_, 1905, p. 400. [57] Abstract from a paper in _Zeit. f. Berg.-Hütten.-und Salinenwesen im preuss. Staate_, 1905, p. 400. [58] Abstract from an article in _Zeit. f. Berg.-Hütten.-und Salinenwesen im preuss. Staate_, 1905, LIII, p. 444. [59] Translated from _Oest. Zeit. f. Berg.-und Hüttenwesen_, 1905, p. 455. End of the Project Gutenberg EBook of Lead Smelting and Refining, by Various