Chemical news and Journal of physical science: Chemical news and Journal of physical science

Crookes, William

Bibliografische Daten

Mehrbändiges Werk

Persistenter Identifier:: 1543223852681

Titel:: Württembergische Ländliche Rechtsquellen

Personen:: Württembergische Kommission für Landesgeschichte

Herausgeber:: Württembergische Kommission für Landesgeschichte

Verleger/Verlag:: Kohlhammer

Erscheinungsort:: Stuttgart

Erscheinungsjahr:: 19XX

Sprache:: deutsch

Signatur:: Einzelsignatur

Schlagwort:: Württemberg; Ländlicher Raum; Recht; Fürstentum Hohenlohe; Landrecht; Dorfordnung

Strukturtyp:: Mehrbändiges Werk

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

Band

Persistenter Identifier:: 1543223852681_2

Titel:: Das Remstal, das Land am mittleren Neckar und die Schwäbische Alb

Autor:: Wintterlin, Friedrich

Jahrgang/Band:: 2

Verleger/Verlag:: Kohlhammer

Erscheinungsort:: Stuttgart

Erscheinungsjahr:: 1922

Umfang:: 12, 978 S.

Sprache:: deutsch

Strukturtyp:: Band

Standort:: Universitätsbibliothek Stuttgart

Signatur:: 1J 1030-2

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

Sammlung:: Monografien

Kapitel

Titel:: Reichsstadt Reutlingen

Strukturtyp:: Kapitel

172 Chemical Notices from Foreign Sources. {eR du wardly with nickel, which is proof against the dilute Tr ho acids present in beer. The possible sophistica- CORRESPONDENCE. tions of malt-liquors—a very formidable catalogue—are aext enumerated, and methods for their dete@ion laid down. Dr. Stietlin premises the very useful caution that beer which has produced unpleasant symptoms in the consumer must not necessarily be supposed to contain poisonous adulterations. If the process of fermentation has failed, or if the liquor is turning sour it may, especially if taken in excess upon an empty stomach, exert a decidedly poisonous action. For proving the physiological action of substances separated out in the course of the analysis, he recommends mice, ‘for which we need entertain no especial compassion if the experiment Succeeds and the subject perishes, and which offer the advantage that the substance in question can be easily recovered from the intestines and from the urine.” The a&ion of any organic base upon the pupil of the eye he ascertains by experiments upon cats. These recommendations, however, are of little value to English chemists, since, according to the peculiar logic of hysterical humanitarianism, they would amount to the sin of vivise&ion. To give.a mouse poison simply for its lestru@ion or for amusement is lawful, but to administer to such an animal a dose of an unknown or doubtful substance, in order to ascertain its nature, is a serious offence without the operator has obtained a special licence from the Home Secretary. Were not incon- sistency one of our most cherished national attributes, we should not tolerate an a&ion perpetrated out of pure wantonness, and yet punish it as a crime if performed with a high and important motive. Dr. Stierlin’s method consists of the following operations :—Determination of the specific gravity of the carbonic acid (upon which he places only a secondary value), of the alcohol, and of accompanying volatile acid. Determination of gluten, of total solids; of the ash, and of its silicic, phosphoric, and sulphuric acids; of its other constituents. Special ex- amination for injurious metals. Resolution of the extract and search for foreign bitters and alkaloids. Finally, he examines the colouring matters both chemically’ and spectroscopically. Such an examination must naturally consume much time, and can only be entrusted to an experienced chemist, but it is idle to expe@ that all the possible im- purities of so complex a fluid can be discovered by a few simple tests. The most interesting #portion of the work consists of the instructions for the detection of substitutes for hops. The author treats the residue obtained on evaporation, first with an acid, and then with ammonia, and subdivides the two portions thus obtained by successive treatment with petroleum ether, benzin chloroform, and metallic alcohol. The author doubts the alleged use of strychnia as an adulterant of beer, since to impart perceptible bitterness to a litre 0'005 to o'ox grm. would be required, a very serious dose, especially as the alkaloid would combine with the free acetic acid always present in beer, in which state much of its original bitterness is lost. Aloes, the use of which, according to Peter Pindar, was suggested by George III, should be sought for not in the beer itself, but in the sediment at the bottom of the cask. An appendix contains an account of Pasteur’s proposed method for excluding from beer during fermentation the germs of all other fungi save the true Mycoderma vind, and thus obviating most of the morbid changes to which malt liquors are subje&. ‘We must pronounce Dr. Stietlin’s treatise a most valuable addition to the literature of chemistry as applied to food and its adulterations. It ought to be in the hands of every public analyst and medical officer of health, as well as of every person who is studying the art of brewing. To the Editor of the Chemical News. Sir,—About twelve years ago I put about an ounce of ‘olled metallic cadmium (coiled six times) into a clear fint-glass phial, corked it tightly, cut the cork level with the mouth of the phial, and sealed it very carefully. At ‘he time the metal did not quite reach up to the neck of che phial. Since that time it has elongated more than a quarter of an inch, and, during the present year, the sealing-wax has been broken all round and the cork forced outward more than one-eighth of an inch, The cork is sven now fairly tight, but the metal follows after it to touching forcibly, and probably the cork will be presently completely forced out. The cadmium is fast oxidising and endeavouring to un- coil itself, and the cut edges at the bottom of the phial are becoming foliated. Allow me to ask if your readers have noticed any such spontaneous change in this metal.—I am, &c., © T. A. READWIN, Liverpool, April rg, 1878. NoTe.—All degrees of temperature are Centigrade, unless otherwise expressed. Berichte der Deutschen Chemischen Gesellschaft, No. 19, December 10, 1877. Determination of Vapour-Densities.—V. Meyer.— The author describes a greatly simplified apparatus for hese determinations, which is essentially the same as that lately described by him to be used with Wood's metal, the latter being replaced, however, by mercury, and the sulphur vapours by those of water, aniline, or ethyl- senzoate. A U-tube, open at one end, contains the sub. stance to be experimented upon, and is filled with mer- cury. It is then hung in an atmosphere consisting of the vapours of one of the above-mentioned liquids until the mercury ceases to flow out, The weight of the mercury which has been ejected the height of the mercury column ‘n the side tube, temperature, and pressure supply the 1ecessary data for determining the density. Vapour-Densities of Reten, Fluoren, Stilben, and Shrysen.—W. Knecht.—The author has determined the vapour-densities of these substances by means of V, Meyer's ipparatus (with Wood’s metal), and obtained results xoinciding with the formule accepted at present. : Introduction of Nitrogen Radicals into Compounds of the Fatty Series.—V. Meyer.—Diazo-benzene-nitrate, when added to a solution of aceto-acetic-ether in HKO, gives rise to a bright yellow compound melting at 154°, rossessing the properties of an acid, and forming yellow inely-crystallised salts. The reaction is— C6Hs.N2.NO3 + CH,.CO.CHK.COOC, Hy + H,0 = - =KNO:+C.H;0H +C6H;5.N2.CH(COOH).CO.CHj. This compound is one of the rare instances of the forma- ion of an azo body in the fatty series. A solution of aceto-acetic-ether in caustic potash, when treated with KNO, and H,S0O,, yields at once a new acid,— S6HgO.N,C6H 1003 + HNO, = H,0 + CsHgO,N., [t is a transparent oil, neither miscible with water nor capable of distillation, dissolving in alkalies with a deep yellow colour, and is probably a nitroso-derivative.

Zugriffsbeschränkung

Nutzungslizenz

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

Mehrbändiges Werk

Band

Kapitel

Inhalt

Downloads

Ganzer Datensatz

Diese Seite

Bildfragment

Formate und Verlinkungen

Links

Zitieren

Ganzer Datensatz

Diese Seite

Zitierempfehlung