Abstract
American Journal of Science, February.—On geometric sequences of the coronas of cloudy condensation, and on the contrast of axial and coronal colours, by C. Barus.—On a new occurrence of sperrylite, by H. L. Wells and S. L. Penfield. A minute quantity of sperrylite, platinum arsenide, was found in a specimen of platiniferous copper ore from the Rambler Mine, Medicine Bow Mountains. Platinum is found in ores from all parts of the mine in quantities varying from 0.6 to 1.4 ounces per ton.—A cosmic cycle, by F. W. Very.—Studies of Eocene mammalia in the Marsh collection, Peabody Museum, by J. L. Wortman. The present instalment deals chiefly with Patriofelis ferox, and contains a detailed criticism of the views recently expressed by H. F. Osborn.—On a miniature anemometer for stationary sound waves, by B. Davis. By sufficiently reducing the dimensions of the cups and vanes in the ordinary anemometer, it was found possible to determine the relation between the amplitude of vibration and the rate of rotation in a stopped organ pipe giving its first overtone. The cups used varied in size from 7.5 mm. to 4.5 mm., and the lengths of the arms from 20 mm. to 8 mm. The curves found correspond closely to the sine curves near thie middle of the loop where the amplitudes of vibration have considerable magnitude.—The occurrence of fossil remains of mammals in the interior of the states of Pernambuco and Alagoas, Brazil, by J. C. Branner.— The estimation of copper as cuprous sulphocyanide in the presence of tin, antimony, arsenic and bismuth, by R. G. van Name. The accurate estimation of copper in the presence of the above-named metals was found to be practicable provided that certain precautions were taken as to the amount of free acid, ammonium bisulphite and sulphocyanide used.—The composition of yttrialite, with a criticism of the formula assigned to thalenite, by W. F. Hillebrand. The empirical formula of Hidden and Mackintosh for yttrialite is confirmed. The formula proposed by Benedicks for thalenite is to be regarded as doubtful.
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Scientific Serial . Nature 65, 404–405 (1902). https://doi.org/10.1038/065404c0
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DOI: https://doi.org/10.1038/065404c0