. Transactions. Fig. 43.—Quenched after 25 hr. at800° C. X Fig. 44.—Quenched after 48 hr. at Fig. 45.—Quenched after 60 hr. at 800° C. X1000. ^800° C. X 1000. Specimens were etched with 5 per cent, nitbic acid in alcohol. ARTHUR PHILLIPS AND E. S. DAVENPORT 487

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