Abstract
American Journal of Science, July.—Geology of the Shonkin Sag and Palisade Butte Laccoliths in the Highwood Mountains of Montana, by W. H. Weed and L. V. Pirsson.—On the manganese ore deposits of the Queluz (Lafayette) district, Minas Geraes, Brazil, by O. A. Derby.—On the bituminous deposits situated at the south and east of Cardenas, Cuba, by H. E. Peckham. On the north of Cuba there is a tract of country more than 4500 square miles in area, the springs and wells of which give indications of the existence of liquid bitumens of varying density. The oil which has been obtained resembles the oils of Russia, but it is doubtful if, in view of the enormous production which recent developments in Texas and Indiana promise, there is at present any encouragement for even experimental drilling in Cuba.—Mineralogical notes, No. 2, by A. F. Rogers. A description of new types of calcite and galena, together with a note of new localities for some rare minerals.—A new solution for the copper voltameter, by W. K. Shepard. A saturated solution of copper sulphate is boiled for a short time to expel the air and then kept for about an hour at 100° C. in contact with metallic copper in order to neutralise the solution. About .05 per cent. of ammonium chloride was then added. Using this solution it was found that the weight of copper was practically independent of the temperature between 20° and 40° C; the solution may be used a large number of times, and the results are independent of the current density between the limits of .02 and .07 ampere per square centimetre.—The thermomagnetic and galvanomagnetic effects in tellurium, by M. G. Lloyd.—Additions to the avifauna of the Bermudas, with diagnoses of two new subspecies, by A. H. Verrill.—The induced alternating current discharge studied with reference to its spectrum and especially its ultra-violet spectrum, by A. W. Wright and E. S. Downs.
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Scientific Serial . Nature 64, 365 (1901). https://doi.org/10.1038/064365a0
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DOI: https://doi.org/10.1038/064365a0