. Transactions. Fig. 12.—B.\dly oxidized copper tre.\ted with 2 per cext. , uxetched. X 20. G. F. COMSTOCK 395. Fig. 13.— showixg black .spots of lead L, dark graysulfide s, bright delta d. axd light gray phosphide p, in fixe particles staxd-ixg olt ix relief .\bove the delta d. axd alpha . uxetched. x 400.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries