MetaZhrgicaZ Chemistry.
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Examination of Food Products Collected by the Station. BY A. I,. WINTON. Conn. Agr. Expt. Sta. A n n . Rep., 21, 15-63. -It appears that oysters are frequently treated with borax, from 5.5 to 38 grains in a pint of oysters having been found. 27 out of 42 samples of sausages examined contained from 8.4 to 50.4 grains of borax. T h e total of 11 samples of salt cod-fish examined also contained considerable amounts, as did three samples of cream. A chemical analysis of date stone coffee is given and results of the examination of some 2 0 0 samples of milk. ___-
IlETALLURGICAL CHEMISTRY. H.0 . H O F M A N , REVIEWER.
Matte-Smelting at the Hall Mines, British Columbia. BY R . R. HEDLEY. Eng. Min. J., 64, 69~-696.--The paper is an illustrated description of the blast-furnace work done a t this smeltery. T h e furnace, 144 by 44 inches a t the tuyere-level, puts through in 24 hours nearly 250 tons charge, producing matte with 49 per cent. copper. The Highland-Boy Mine and Ilill, Bingham, Utah. Eng. Min. J . , 64, 665-666.-"he mill which started work in September last. combines pan amalgamating and cyaniding, the coarse gold being recovered from the ore by the former process, the fine gold by the latter. The Modern Gold Chlorination Process for the Treatment of Gold Ores. BY J. E. ROTHWELL. Min. Sci. Press, 75, 573.-A short illustrated description of a chlorinating plant, using t h e Pearce turret furnace for roasting, and the Rothwell barrel, emphasis being laid more on the practical and economic than on the chemical side of the operations. Chlorination and Cyaniding. BY C. C. BURGER. Eng. Min. /. , 64, 663.-In comparing barrel-chlorination with cyaniding, t h e author estimates the cost of chemicals per ton of ore to be from 60 to 7 0 cents for chlorinating and from 30 to 40 cents for cyaniding, but chlorinating has the advantage of requiring less fine-crushing (14 to 16 mesh vs. 30 to 40 mesh) and of giving a higher extraction (90-9 j vs. 80-85 per cent.). Distance from railroad even does not make chlorinating excessively costly; e. g . , at Gibbonsville, Ida., the 2 0 pounds of chemicals required per ton of ore are hauled IOO miles a t I cent a pound, and make the additional cost of chlorinating only 2 0 cents. Cyaniding Sulphide Gold Ores. BY R . RECKNAGEL. Eng. Min. I., 64, 580-581 .-A paper very general in its character. Among other things the author calls attention to the fact that
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Review o/ American Chemical Research.
t h e gold in some sulphides is soluble, while in others it is insoluble. A very interesting fact is that of iron disulphide; if present as marcasite, it is liable to have a strong decomposing influence upon cyanide, while if present as pyrite this i s not likely to be t h e case, provided, of course, t h a t the sulphide has not been oxidized by atinospheric action. Roasting removes most of t h e difficulties, if a dead-roast is obtained ; a sulphatizing roast, followed by dissolving out the sulphates with water before using the cyanide solution, gives unsatisfactory results as to consumption of cyanide (some sulphate remaining insoluble in water, b u t acting upon cyanide) and extraction of gold (some sulphide remaining undecomposed) .
Some Products Found in the Hearth of an Old Furnace upon the Dismantling of the Trethellan Tin Works, Cornwall. BY W. P. HEADDEN.PYOC. CoZ. Sci. Soc., A h . 6, r897.-The paper contains a number of elementary cheniical and microscopical analyses of the products and deductions as to t h e rational analyses and the way the products were formed. Kryolith, Its Mining, Preparation, and Utilization. BY W . C. HENDERSON. /. Franklin Insf., 145, 4~-54.-'I'he author discusses briefly the properties of the mineral, the history of its discovery, its occurrence, and the methods of mining, shipping, and conversion into soda and alumina. Two grades are produced, one of which, gg per cent pure, goes to Copetihagen, and the other, 92 per cent. pure, to Philadelphia, where t h e Pennsylvania Salt Co. produces, by the Thomsen process, soda and alumina, the latter serving as raw material for the production of alum. Kryolith is also used as a flux in the electrolytic reduction of alumina and in the production of Kryolith glass. Direct Recarbonizing of Steel from the Blast-furnace. BY C. KIRCKHOFF. Iron &e, 60, No. 23, p. 4.-C. H. Foote, W. K. Walker, and E. A. S. Clarke, of the Illinois Steel Co., have succeeded in using spiegeleisen direct from the blast-furnace in recarbonizing steel, the spiegel being taken from the blast-furnace into a mixer, whence it is poured for neutralizing as needed.
