. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Figs. 1 and 3 = Sphorulitie and micropegmatitic structures in olisidian. (Alter Iddings, Vllth Ann. Rep. V. S. Geol. Snrv., 1885-86, pi. xv.) Figs. 2 and i = .Similar structures in euteetic alloys; from micmphotograplis by Stead. •_• ^ \ simple spherulite in the euteetic of lead atid antimony;" 4 = Micropegmatitic structure in magnolia-metal (lead, 80 por'cent; antimony, 15 per cent; and tin, 5 per cent). are mereh^ accidental, and, if
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Figs. 1 and 3 = Sphorulitie and micropegmatitic structures in olisidian. (Alter Iddings, Vllth Ann. Rep. V. S. Geol. Snrv., 1885-86, pi. xv.) Figs. 2 and i = .Similar structures in euteetic alloys; from micmphotograplis by Stead. •_• ^ \ simple spherulite in the euteetic of lead atid antimony;" 4 = Micropegmatitic structure in magnolia-metal (lead, 80 por'cent; antimony, 15 per cent; and tin, 5 per cent). are mereh^ accidental, and, if not, they point to the conclusion that micropegmatite is an euteetic compound. From this i)oint of view it becomes of interest to determine the melting- point of fused micropegmatite. This was kindly done for me i)y Professor Joly by observations with the nieldometer. lie found that fused micropegmatite melted .somewhat more i-eadily than ortho- clase, but less readily than fus(>d orthoclase. These observations do not support the euteetic^ hypothesis, but they <;an scarcely be .*;aid to «The outlines of this splionilite ai-e soiuewhat too shari)ly Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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