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Nature volume 52, pages 261262 | Download Citation



Bulletin de l'Académie des Sciences de St. Pétersbourg, Ve série, t. ii. No. 2, February 1895.—We notice in the proceedings of the meetings, that the full account of Baron Toll's observations in the New Siberia Islands will soon be published by the Academy. In the meantime the explorer has visited Switzerland in order to study glacier ice, and has found there further proofs, supported by A. Forel, in favour of the masses of ice which he has found in New Siberia (buried under clays containing fossil stems of Alnus fruticosa fifteen feet long), really being remains of the ice-sheet which covered the islands during the glacial period.—The yearly report of the Academy, which contains, among other matters, the obituaries of L. Schrenck, A. Middendorff, I. Schmalhausen, and P. TschebychefT, whom the Academy has lost during the last year.—The positions of 140 stars of the star cluster 20 Vulpeculæ, according to measurements taken from photographic plates, by A. Donner and O. Backlund (in German). The measurements were taken on two plates, one of which had been exposed for twenty minutes only, and the other for one hour, and the accord between the two is most satisfactory, the average difference being 0˙00S. in right ascension, and 0″˙02 in declination, while the difference between the measurements on the photographic plates, and the direct measurements of Schultz, attains on the average -0˙040S. in R.A. and - 0″˙55 in D.—On the differential equation dy/dx = I + R (x)/y, bycheff, about his rule for finding the approximate length of a cord, and the means of extending the method to curves of double flexure (all three in Russian).—The ephemeride of the planet (108) Hecuba, by A. Kondratieff.

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