. Transactions. fi?^- Tst biax. u:J.:; ---J ^-? anneal PiQ 5—Etched with ammonia and hydrogen peroxide. X 75. Brin. W. H. BASSETT AND C. H. DAVIS 437 PER CENT. REDUCTION PER CENT. REDUCTION. Brin. 400 C. axm: i Brin. Fig. 6.—Etched with ammonia and hydrogen peroxide. X 75. 438 A COMPARISON OF GRAIN-SIZE MEASUREMENTS .9 PER CENT. REDUCTION ^.

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries