Transactions . Solution. Cyanide. Treatment Lbs. Oz per ton. Oz. per ton. Per cent. Per cent. Lbs. Hours. 40, . .20 1 24 40, . .76 1 24 40, . .42 1 24 . 40, . .14 1 24 40, . .36 24 40, . .12 1 24 I infer that a recovery of at least 90 (and probably 92 or 93)per cent, of the gold values could be insured, at a cost for cyan-ide of about $ per ton. These figures refer only to therecovery of gold; but in our case, and in the case of other oresin this district, gold, (and a trifling quantity of silver
Transactions . Solution. Cyanide. Treatment Lbs. Oz per ton. Oz. per ton. Per cent. Per cent. Lbs. Hours. 40, . .20 1 24 40, . .76 1 24 40, . .42 1 24 . 40, . .14 1 24 40, . .36 24 40, . .12 1 24 I infer that a recovery of at least 90 (and probably 92 or 93)per cent, of the gold values could be insured, at a cost for cyan-ide of about $ per ton. These figures refer only to therecovery of gold; but in our case, and in the case of other oresin this district, gold, (and a trifling quantity of silver) is theonly valuable material in the concentrates. When lead or othervaluable products form an important item in the value of con-centrates, this process would not be applicable. I wish to acknowledge my indebtedness in the preparationof this paper to Messrs. H. W. Mussen, engineer, F. VansAgnew, assayer, and A. Constans, foreman, all of whom fur-nished valuable information in connection BIOGB kPHIC M. \i [CI l J081 Ill COH I 1 , Biographical Notice of Joseph Le Conte. BY v B. (ii i:i-tv. i DIVERSITY OF CALIFORNIA, BERKELEY, ( ; ri< an M< etlng, November, L9 In the death of Joseph Le Conte, al Yosemite, Cal., on July6, 1901, the Institute has lost one of its most distinguishedhonorary members, and the University of California it- mbeloved professor. The South has produced many distinguished men. In thelaw, in politics, and in war. they have made their mark, andwe are all proud of their records. But in science not so manyhave achieved distinction. The Le Conte family is thus themore remarkable, in that it has produced three men of emi-nence in that field, while there are descendants of promise ye1to be heard from. It is always interesting to trace the influences that go tomake a great life; and in this case I am able to draw upon anabundance of material in the manuscript autobiography whichProf. Le Conte completed shortly before his death. Throughth
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