Abstract
American Journal of Science August.—The terraces of the Westfield River, Mass., by W. M. Davis. Miller's theory of defending ledges gives a better explanation of these terraces than any other, the normal action of a meandering and swinging river sufficing to account for nearly all the details of terrace form.—Notes on the Cretaceous turtles, Toxochelys and Archelon, with a classification of the marine Testudinata, by G. R. Wieland.—The magnetic effect of electric displacement, by J. B. Whitehead, jun. After a short historical account and criticism of the previous work done in this field, new experiments are described, the net result of which is against the presence of the magnetic effect of electric displacement in an amount given by Maxwell's expression. Only once was a positive result obtained, and this is regarded as being liable to question.—Certain relations of plant growth to ionisation of the soil, by A. B. Plowman. The experiments described show that negative charges stimulate and positive charges paralyse the embryonic protoplasm of,plants.—The demagnetising effects of electromagnetically compensated alternating currents, by Z. E. Crook. An experimental study of the effects of the alternating current on the magnetic properties of iron and steel, with special reference to the effect due to the current independently of that produced by the circular magnetism.—Nepheline and other syenites near Port Coldwell, Ontario, by A. P. Coleman.—The double ammonium phosphates in analysis, by M. Austin. A study of the best conditions for the determination of zinc and manganese as double ammonium phosphates.—On the electrical resistance of glass, quartz, mica, ebonite and gutta percha, by O. N. Rood.
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Scientific Serial . Nature 66, 408 (1902). https://doi.org/10.1038/066408a0
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DOI: https://doi.org/10.1038/066408a0