In Large 8vo. Handsome Cloth. Fully Illustrated. 12s. 6d. net. =ANTIMONY: Its History, Chemistry, Mineralogy, Geology, Metallurgy, Uses and Preparation, Analysis, Production and Valuation.= BY C. Y. WANG, M. A., B. SC. “There is not, to our knowledge, any other complete treatise on antimony among all the English text-books.”—_Iron and Coal Trades’ Review._ =LONDON: CHARLES GRIFFIN & CO., LIMITED, EXETER STREET, STRAND.= FOOTNOTES: [1] This figure indicates thousandths of an inch. [2] The term “impurity” might in several instances be replaced by the word “constituent,” since many so-called impurities are purposely added for conferring desired properties on the metal. It is here taken as implying elements other than copper. [3] The temperatures given in Heyn’s diagram require revision in the light of later knowledge, and have been omitted here. [4] The treatment of flue-dust is considered later. [5] Though these actions represent with fair accuracy what occurs on smelting, there will be indicated later, in the proper place, some modification, due to interactions of certain oxides and sulphides, in the furnace. [6] It might also be possible to assist the concentration in the matte by the addition of any available oxidised ores or residues. [7] The chloridising roasting of copper ores is also sometimes employed in connection with wet processes. [8] When copper combines with sulphur. 2Cu : Cu_{2}S :: 2 × 63·5 : 2 × 63·5 + 32 :: 127 : 159 :: 4 : 5 approximately. When sulphur combines with iron. S : FeS :: 32 : 56 + 32 :: 32 : 88 :: 4 : 11. [9] Some flue-dust is also melted down. [10] The East Butte Copper Mining Company has recently reported the successful sintering of its flue-dust by Dwight-Lloyd machines. (See _Mining Journal_, Jan. 6, 1912, p. 21). [11] Later work on this subject has been published by W. Wanjukoff:—“Investigations on the Conditions governing the Entry of Copper into the Slags on Matte-Smelting, on the Chemical Form in which such Copper exists, and on the Lessening of the Copper Losses in Slags.” _Metallurgie_, 1912, Vol. x., Nos. 1 and 2, pp. 1–27, Jan. 8 and 22, 1912. [12] This point will be dealt with in due course. [13] The iron sulphide of a copper matte is probably the eutectic of the iron-sulphide : iron series containing about 85 per cent. of sulphide. [14] Ducktown Sulphur, Copper, and Iron Company. [15] These views have recently been controverted in an interesting paper by G. A. Guess. (“Notes on Pyritic Smelting,” _Engineering and Mining Journal_, 1912, Jan. 13th, p. 113). He defines Pyritic Smelting as the production of a Ferrous Silicate Slag from Iron Sulphide Ore. [16] With nickeliferous mattes, the green colour in the flame is reported by Heywood to persist throughout the whole process.