Abstract
American Journal of Science, November.—Missourite, a new leucite rock from the Highwood Mountains of Montana, by W. H. Weed and L. V. Pirsson. This new rock type forms a stock of granular rock intrusion in cretaceous shales, and in the fragmental volcanic material which overlies them, both being highly altered near the contact with the igneous mass. It is dark grey, coarsely and evenly granular, and on closer inspection presents a mottled appearance. The minerals present are apatite, iron ore, olivine, augite, biotite, leucite, and some zeolitic products. This is the first granular volcanic rock in which leucite has been found.—Viscosity of mixtures of liquids, by C. E. Linebarger.
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