Transactions . tably in ex-perimental work for testing the rate of solution; from a definiteamount of solution 1 to 5 is taken, and either evaporatedwith lead or the gold is precipitated by AgN03, and the pre-cipitate reduced and parted, and estimated as above. Themethod of course requires some calculation for the amountssubtracted from time to time; but, on the other hand, it is allfrom the same sample. Much valuable information can berapidly gained from a few well-chosen tests of this kind. The method is of great value in tests in regions remote fromassay offices. One gram of properly p
Transactions . tably in ex-perimental work for testing the rate of solution; from a definiteamount of solution 1 to 5 is taken, and either evaporatedwith lead or the gold is precipitated by AgN03, and the pre-cipitate reduced and parted, and estimated as above. Themethod of course requires some calculation for the amountssubtracted from time to time; but, on the other hand, it is allfrom the same sample. Much valuable information can berapidly gained from a few well-chosen tests of this kind. The method is of great value in tests in regions remote fromassay offices. One gram of properly prepared sample treatedeither by direct fusion or a larger amount amalgamated, anddirect fusion of gram will closely check the ordinary fireassay on ores as low as .2 oz. Au per ton. Acknowledgments are due to Mr. H. W. Turner, U. S. Geo-logical Survey, for specimens furnished for assay, and to M. Bell, of San Francisco, for the use of his laboratoryand assistance rendered during the James F. Lewis. BIOGB Miih \i. KOI [l i: 01 J \Mi. I . v I 1 Biographical Notice of James F. Lewis. 15V u. \v. RAYMOND, FORK OITT.(Mexican Meeting, November, 1901.) It would be unjust to these Transactions, as well as to theBubject of tliis notice, it* the death of one whose professionalenthusiasm, executive ability, noble character and winning per-slity have contributed so much to the profit and enjoymenl ofhis innumerable acquaintances (that is to say,friends), and to thesuccess of the American Institute of Mining Engineers, shouldpass without special recognition of his service and merit. At thetime of Mr. Lewiss death, July, 1901,1 was not willing to waituntil the November meeting in Mexico, before publishing mypersonal tribute to my dear friend of many years. Nor was Iwilling, on the other hand, to forego the privilege (which I feltmyself almost ready to claim as a right) of contributing to ourTr<msactions this Biographical Xotice of one of the dwindling
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
