. Transactions. Fig. 28.—Within light area op Fig. _i ; uirusnE notch during treatmentAusTENiTic. Etched 15 sec. with 4 per cent, nitric acid. X Fig. 29.—Same as Fig. 27; junction of light and dark areas. 15 sec. with 4 per cent, nitric acid. X 500. H. E. WHEELER 279

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries