. Transactions. FiQ. \..i i:. :, ...... ■.! ,-.,.,11, I wNUM^iiwx .vM. I i;i. ,, ,,, ., ,,-, Fig. 33. Broken at lUU U. Iltcued 10 SEC. WITH 4 PER cent, nitric acid. X 500. H. E. WHEELEK 283. Fig. 37.—Another bar like Fig. 33, broken at 150° C. Etched 10 sec. with 4 PER CENT, nitric ACID. X 500.

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