Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart

Fraas, Oscar; Krauß, Ferdinand von; Marx, Karl von; Zech, Paul

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Persistenter Identifier:: 1602495396786

Titel:: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart

Erscheinungsort:: Stuttgart

Erscheinungsverlauf:: 18XX

Strukturtyp:: Zeitschrift

Sammlung:: Gesellschaft für Naturkunde in Württemberg e.V.

Lizenz:: https://creativecommons.org/publicdomain/mark/1.0/deed.de

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Persistenter Identifier:: 1602495396786_43_1887

DOI:

Titel:: Jahreshefte des Vereins für Vaterländische Naturkunde in Württemberg : zugl. Jahrbuch d. Staatlichen Museums für Naturkunde in Stuttgart

Herausgeber:: Fraas, Oscar; Krauß, Ferdinand von; Marx, Karl von; Zech, Paul

Jahrgang/Band:: Bd. 43, 1887

Erscheinungsjahr:: 1887

Sprache:: deutsch

Strukturtyp:: Band

Standort:: Universitätsbibliothek Stuttgart

Signatur:: XIX965/8

Lizenz:: https://creativecommons.org/publicdomain/mark/1.0/deed.de

Sammlung:: Gesellschaft für Naturkunde in Württemberg e.V.

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Banus : Chemical Notices from Foreign Sources. 237% . in Bin - — —— omc CORRESPONDENCE * he has studied the sperum of barium, and has succeeded ' in resolving its bands into a great number of fine rays, perfectly well defined. Vapour Density of Ammonium Sulphide.—G. Salet. —On mixing equal volumes of hydric sulphide and of am- monia at the temperature of 80° no contraction was ob- served. Solution of Platinum in Sulphuric Acid.— M. Scheurer-Kestner.—In a former communication (Comptes Rendus, 1xxxi., p. 892) the author has shown that during the industrial concentration of sulphuric acid in vessels of platinum, the quantity of this metal dissolved in acid free from nitrous compounds increases with the concen- tration of the acid. New experiments undertaken for the »urpose of preparing fuming sulphuric acid have induced aim to continue his observations. The ation upon the metal, so much promoted by concentration beyond g5 per sent, is still further intensified with the concentration of the monohydrated acid. On decomposing sodium bisul- phate by heat in earthen retorts lined with platinum, r grm. of metal was dissolved for each kilo. of fuming acid produced. The metal is found in a soluble state mixed with the sodium sulphate. On Vitreous Melted Saccharose.—H. Morin.—If neated with water under certain conditions saccharose is transformed into a vitreous produé, which preserves its transparency more or less according to the manner of cooling. If this has taken place gradually the produ& is translucid, but mixed with prismatic crystals. If the cooling is rapid this partial crystallisation is avoided. It contains on an average 3°28 per cent of water, and its sp. gr. at 14°5° is 1°966. Certain Derivatives of Isobutylic Ether.—E. De- mar¢ay.—In a former communication the author has shown that it is possible by means of ethylacetic ether to obtain a series of compounds corresponding to the formulae :—3CyHan- 402+ H20 and 3C,Hzy-4054-H,0 The process for obtaining these acids consists in decom- posing with alcoholic potassa the bromised derivatives of the substituted acetylacetic ethers, The author has now examined this readtion upon isobutylacetic ether, and ascertained the circumstances and the secondary reactions which determine or accompany the formation of this body. No. 18, May 6, 1878. Extension of Fourier’s Formule Relating to the Propagation of Elec¢tricity.—A. Cornu.—There is-a complete similarity of movement between the transmission of eleéricity and that of elastic waves, and the expression “ ele@ric wave” is under certain conditions perfectly justifiable. Telegraphic Use of the Telephone.—M. Gressier.— An inquiry into the nature of various sounds heard when the telephone is connected with or runs in the proximity of a telegraphic line. After the paper had been read M. du Moncel pointed out that the currents mentioned by M. Gressier had been long ago studied with simple galvano- meters, and had been the subje& of four memoirs presented by him to the Academy of Sciences in 1872 (Comptes Rendus, 1xxv., p. 956, 1098, 1504, and 1622). Crystallisation of Silica in the Dry Way.—P. Haute- feuille.—Acid phosphate of soda and tungstate of soda are both agents in the mineralisation of silica, but the latter exerts a more energetic action, even at a lower tem- perature, which permits its employment for the reproduc. tion of the numerous silicates, more or less fusible, asso- ciated with silica in rocks. Isobutylacetylacetic Ether.—Euy. Demargay.—In a srevious communication the author has described the different rea@ions which monobromated isobutylacetyl- acetic acid undergoes under the influence of alcoholic sotassa. He now makes known the processes by means >f which the different products are prepared and separated. DETECTION AND ESTIMATION OF FREE MINERAL ACID IN SULPHATE OF ALUMINA. To the Editor of the Chemical News. Sir,—As a brief extract of the paper read before the Chemical Society which appeared in the CHEMICAL NEWS, vol, xxxvi., p. 211, is not accurate in some of its details, may I beg to offer the following correction. In qualita. tively testing for free acid I use a very weak solution of the peracetate, but for quantitative results a strong one. For the quantitative method, which your reporter alone gives, a much stronger solution than the one described will be found necessary,—I am, &c., A, EsiLMAN, CHEMICAL NOTICES FROM FOREIGN SOURCES. Nore.—All degrees of temperature are Centigrade,unless otherwise expressed. Comptes Rendus Hebdomadaives des Séances, de I Académie des Sciences. No. 17, April 2g, 1878. Production of the Laminary Systems of Plateau.— A. Terquem.—The author, by substituting in the poly- hedra of Plateau flexible wires for a certain number of rigid rods, produces very readily and with a minimum quantity of liquid laminary systems of very considerable iimensions. Ultra-violet Absorption Spectra of the Earths in Gadolinite.—J. L. Soret.—The author has been repeating the observations of MM. Marignac and Delafontaine, which show the presence of yttria and erbia, and probably of terbia (erbia of Mosander). A fourth earth which the author merely designates as x seems likewise to be pres- ent. The author appends to his paper a diagram of the spectra of the four bodies. Formation of Metallic Arsenides. —A. Descamps.— An account of the arsenides of lead, nickel, cadmium, zinc, iron, bismuth, tin, and antimony. Electric Discharge in Tubés Containing Rarefied Gases.—MM. Warren de la Rue and Hugo W, Miller.— The discharge in a tube of rarefied gas does not differ from :hat which takes place in air or other gases at the atmo- spheric pressure. It is not a current in the ordinary sense of the term, but a disruptive discharge, the gaseous molecules effe@ing a transport of eleétrisation. The gases orobably receive two impulsicns in opposite directions, that from the negative ele@rode being the more continuous. There are sometimes formed metallic spots upon the tubes, which leave a permanent trace of the intervals comprised between the strata. Magnetic Rotation of the Plane of Polarisation of Light under the Influence of the Earth.—H. Bec- juerel.—The author describes an experiment for demon- strating the above phenomena. Suppression of the Return Wire in the Use of the Telephone.—M. Bourrouze.—The authors have found that the circuit may be closed by the earth without a return wire, the sounds being transmitted with great dis- tin&kness. : Transparence of Coloured Flames for their Own Radiations.—M. Gouy.—An account of the result of spe@roscopic researches on narrow rays. The authot adds in conclusion that in conjunction with M. Thollon

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fullscreen: Chemical news and Journal of physical science (Volume 37, 1878 (January - June))

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