. Transactions. Fig. 3. Fig. 4. (X. Fig. o. Fig. 6.—Cool end. Figs. 1-6.—Alloy 75 cu, 15 sn, 10 zn. Etched with ferric chloride. X 800. SAMUEL L. HOYT 201 lower temperature, a well defined reaction rim is formed between a and a still lower temperature this reaction rim has grown somewhat, whilesmaller crystals of the new phase have formed at the central parts of theoriginal /3 constituent. While this new phase has the appearance of beinga reaction rim, it must be conceded that proof that it is such is yet lack-

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