. Transactions. Bhin. 100 ° C. AXXEAL Bhix. lOG Fig. 4.—Etched with ammonia and hydrogen peroxide. X 75. 436 A OF GRAIN-SIZE MEASUREMENTS PER CEXT. REDUCTION 4 PER CEXT REDUCTION. 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

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries