. Smithsonian miscellaneous collections. upper, an area showing elongated grains; light picral, x 100. diverseorientation of crystallographic planes in the elongated grains givethem a different sheen from that of adjacent grains. Lower, inclusion of troilite surrounded by schreibersite. The whitedroplets apparently are kamacite rejected from the cooling fe-fessolid solution. light neutral sodium picrate only, x 250. the picralstain on the phosphide areas shows a reticulated pattern. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 104, NO. 23, PL. 3

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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience