Abstract
Archives of the Physical and Natural Sciences, Geneva, September 13.—Verification of some atomic weights (second memoir); zinc and magnesium, by M. C. Marignac. The atomic weight of zinc, fixed by Erdmann at 65.05 and by Favre and Jacquelain raised to 66, is approximately determined at 65.33, a ngure which further analysis may show to be slightly too low. For magnesium, calculated by MM. Marchand and Scheerer at 24 and by others at 24.5, the number 24.37 results from the author's fresh experiments.—Essay on the protistology of Sardinia, with a description of some new or little-known lower animal organisms, by Prof. Corrado Parpna. In the fresh and marine waters of Sardinia the presence is determined of as many as 228 species belonging to the families of Bacteria —Monera, Flagellata, Lobosa, Diatomea, Heliozoa, Ciliata, Acineta, and Catallacta. The paper is accompanied by seven illustrations.—Memoir on earthquakes and volcanoes (continued), by Prof. F. Cordenons. In tins second and concluding part the author expounds his own views, and argues against the generally accepted theory that underground disturbances of all sorts have their source, not in the upper but in the lowest regions of the earth's crust.—On a case of commensalism between a fish (Caranx melampygus) and a medusa (Crambessa palmipes), with two illustrations, by M. Godefroy Lunel. In this instance the fish appears as the parasite or guest of the medusa, taking up its abode in one of its cavities, which it enters and leaves at pleasure without apparent injury to the gelatinous substance of the sea-nettle. This circumstance, which has been fully verified, seems to throw a new light on the relations of a species of Schedophilus to the medusa, on which it is supposed to feed, and has accordingly, by Prof. Cocco, been named Schedophilus medusophagus. One of these is described by Günther in the Transactions of the London Zoological Society, October, 1882.—Meteorological observations with tables of temperature and barometric pressure made at the Observatory of Geneva and on the Great Saint Bernard during the month of August.
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Scientific Serials . Nature 28, 583–584 (1883). https://doi.org/10.1038/028583a0
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DOI: https://doi.org/10.1038/028583a0