CHEMICAL NOTICES FROM FOREIGN form of indifferent oxygen. Potassium tetroxide is also SOURCES. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences. Vol. clv., No. 12, September 16, 1912. This number contains no chemical matter. No. 13, September 23, 1912. Conditions of Formation of Nitrous and Nitric Acids from Oxides of Nitrogen and Water.-E. Briner and E. L. Durand,-In presence of water the following reaction occurs :-N2O3 + H2O = 2HNO2. Thus in the aqueous phase colourless molecules of HNO2 exist in solution and coloured molecules of N2O3. As the quantity of the latter is increased the limit of its solubility is reached, and then a liquid N2O3 phase is formed. Thus nitrous anhydride behaves like SO3 and CO2, except that in the gaseous state it dissociates into NO and NO2(N204). With NO2 in presence of water the reaction is 2NO2 + H2O NO2H+ HNO3. Berichte der Deutschen Chemischen Gesellschaft. Preparation of Acrolein.-A. Wohl and B. Mylo.Any sulphate which gives free sulphuric acid at a comparatively low temperature can be used as a catalyser in the preparation of acrolein from glycerin. Such sulphates are potassium bisulphate, aluminium, ferric, and copper sulphates. Sodium and potassium sulphates have no effect. For quantitative experiments magnesium sulphate is the best to use. p-Nitroso-phenylarsinic Acid.-P. Karrer.- The oxidation of a neutral or faintly alkaline solution of atoxyl by means of neutral sulpho-monoper-acid solution gives p-nitroso-phenylarsenic acid, NO AsO(OH)2. On acidifying the liquid the substance separates out in fine yellow needles, which are slightly soluble in cold water and dissolve easily on heating. The substance exhibits all the typical nitroso reactions. On being heated it does not melt, but turns brown or black at about 180°, and decomposes with an explosion at a higher temperature. It possesses no medicinal properties. Derivatives of Anhydro-glucose.-Emil Fischer and Karl Zach.-Anhydro-glucose, recently prepared by the authors, shows great similarity to grape-sugar in its behaviour towards phenylhydrazine and alkalis, and in its relations to anhydromethyl glucoside. When it is treated with sodium amalgam it yields an alcohol, C6H12O5, for which the authors suggest the name anhydrosorbite, and oxidation with bromine converts it into an acid, anhydro-gluconic acid. o- and p-Mercapto-benzaldehydes.-P. Friedländer and Emil Lenk.-o and p-Amido-benzaldehydes may be diazotised and their diazo-compounds give rhodan or xanthogen-benzaldehydes when treated with potassium rhodanate or xanthogenate. The action of alkalis or alkaline sulphides gives the mercaptan aldehydes in the form of their stable alkali salts. The free mercaptan aldehydes may be obtained from these salts, but they very readily undergo condensation. The disulphides of the two aldehydes are much more stable, and are crystalline substances which give the usual aldehydes reactions. formed. At the ordinary temperature the "ozonised potash" gradually loses its colour, and is converted into a mixture of potassium hydroxide and tetroxide. Atti della Reale Accademia dei Lincei. Relation between Phototropism and Constitution. —M. Padva and L. Santi.—Apparently the rule established for the relation between constitution and phototropism in the case of the hydrazones cannot be applied to the osazones. With the fulgides phototropism is exhibited only when, of the four radicles, one or two are hydrogen atoms. With the osazones the derivatives corresponding tot 1: diphenylfulgides are precisely those in which Biltz and the authors have observed phototropism. The substances corresponding to the completely substituted (tetraphenyl) fulgides are the osazones obtained from disubstituted hydrazines, like methylphenyl and diphenylhydrazine. The authors have prepared some of these derivatives, and have found that not one of the methylphenyl or diphenyl osazones is phototropic. Bromo- and Chloro-guaiacols.-Temistocle Jona.5-Bromoguaiacol can be prepared from the 5-nitro compound, by reducing it and then diazotising and brominating :— C6H3(OH)(OCH3)(NO) 1 : 2 : 5 → C6H3(OH)(OCH3)(NH2) 1: 2:5→ C6H3(OH)(OCH3)Br I: 2:5 The best way to prepare 3-chloro-guaicol is to start with 1.2.3.4-0 - nitro - vaniglinic C6H2(OH)(OCH3)(NO2)(ČOOH), reduce it by means of tin and hydrochloric acid, to give 3-amino-guaiacol, and then pass as before to the 3-chloro compound. MISCELLANEOUS. acid, The Possibility of Silver in Manurials.-There is a possibility of silver being found in a mineral substance used commonly in this country as manure, possibly apatite or some calcium and phosphate combination. Solid lumps placed in a red-hot fire display an unusual property of being ejected with explosive violence, and the mineral closely resembles a class of mineral found in Canada and from which silver is extracted.-J. C. THOMLINSON, B.Sc. Royal Institution.-A General Meeting of the Members of the Royal Institution was held on the 4th inst.; Sir James Crichton-Browne, Treasurer and Vice-President, in the Chair. Dr. J. H. McBride and Miss Jane Worth were decease of Prof. Henri Poincaré, an Honorary Member of elected Members. The Honorary Secretary reported the the Institution, and a resolution of condolence with the family was passed. Royal Institution.-The Eighty-seventh Christmas Course of Juvenile Lectures, founded at the Royal Institution in 1826 by Michael Faraday, will be delivered this year by Prof. Sir James Dewar, LL.D., D.Sc., Ph.D., F.R.S., Fullerian Professor of Chemistry, his title being "Christmae Lecture Epilogues." The Lectures will be experimentally illustrated, and the subjects are as follows: 'Alchemy," Saturday, December 28, 1912; "Atoms." December 31; "Light," January 2, 1913; "Clouds," January 4; ་་ Meteorites," January 7; Frozen Worlds," January 9. The lecture hour is 3 o'clock. 66 Action of Ozone on Alkali Hydroxides.-Wilhelm Traube. When ozone acts on solid potassium hydroxide most of it is converted into ordinary oxygen, but a small portion is taken up by the alkali, giving a reddish yellow FRIDAY, compound. The raw product is not a single substance, but contains, besides unchanged hydroxide, at least two higher oxides of potassium. One of these is characterised by the fact that in contact with water it gives up all the oxygen it contains in excess of that present in KOH, in the MEETINGS FOR THE WEEK. 8th.-Physical, 8. "Method of Measuring the Thomson Effect," by H. R. Nettleton. "An Improved Joule Radiometer and its Applications," by F. W. Jordan. "Attainment of a Steady State when Heat Diffuses along a Moving Cylinder," by Miss A. Somers. "Thermomagnetic Study of Steel," by S. W. J. Smith. BOOKS! F. E. BECKER & CO., 17-27, HATTON WALL, E.C. Books on Scientific, Technical, SECOND-HAND AT HALF PRICES! NEW at 25% Discount W. & G. FOYLE, 135, Charing Cross Rd., London, W.C. NOTICES. E Nov. 8, 1912 FREDK. JACKSON & CO., Ltd., ORSAT GAS ANALYSIS APPARATUS. THE 14, CROSS STREET, MANCHESTER. GOODS ENTRANCE : 10, Half Moon Street. TELEGRAPHIC ADDRESS: BALANCES, Apparatus, Manchester. GENERAL CHEMICAL APPARATUS, HEMPEL and ORSAT GAS ANALYSIS THE LONDON GAS REFEREES' CAS BURETTES OF VARIOUS KINDS. ILLUSTRATED PRICE LISTS FREE ON APPLICATION. AMATEUR PHOTOGRAPHER COVERS FOR BINDING. and PHOTOGRAPHIC NEWS. Edited by F. J. MORTIMER, F.R.P.S. Price TWOPENCE-Every TUESDAY. The Leading Paper for Everyone interested in Photography. Special Articles on PICTORIAL and PROFUSELY ILLUSTRATED. Office: 51, LONG ACRE, LONDON, W.C. PORCELAIN- HALDENWANGER Can be obtained from all businesses which deal in Chemical Apparatus. London: Printed and Published for the Proprietor by EDWIN JOHN DAVEY, at the Office, 16, Newcastle Street, Farringdon Street, E.C. November 8, 1912 Edited by AND JOURNAL OF PHYSICAL SCIENCE Establish [Sixty-eight years. Sir Wm. Crookes, O.M., F.R.S.] (WITH WHICH IS INCORPORATED THE "CHEMICAL GAZETTE"). Vol. 106.-No. 2764. [Cop Friday, November 15, 1912. Registered as PRICE 44. a Newspaper. POST FREE 41d. Chemist (23), B.Sc. (Lond.), Chemistry Hons., Position as Works Chemist. Experience of Alkali Ammonia, and Tars. Good references.-Address, L. D., CHEMICAL NEWS Office, 16, Newcastle Street, Farringdon Street, London, E.C.. FOR SALE. Well fitted Chemical Labora tory, situated in Leeds, near stations. Suitable for Analyst.Apply, 52, Victoria Road, Headingly, Leeds. ....... 242 Wanted, Junior Assistant Chemist for Metal SOCIETY OF CHEMICAL INDUSTRY CHEMICAL NOTICES FROM FOREIGN SOURCES MISCELLANEOUS.............. ................. 246 ........ 246 LEAD ASHES, SULPHATE OF LEAD, LEAD SLAGS, ANTIMONIAL LEAD, COPPER MATTE, TIN ASHES, &c., ORES, DROSS, or RESIDUES, containing TIN, COPPER, LEAD, and ANTIMONY. OZONE APPARATUS for the LABORATORY. 12 Page Illustrated Pamphlet, fully describing various forms of Apparatus and method of using them, Post Free to Readers of the "Chemical News." OZONAIR, Ltd., 96, VICTORIA STREET, WESTMINSTER, LONDON, S.W. LEWIS'S Circulating LIBRARY. Annual Subscription.. from One Guinea. TECHNICAL AND SCIENTIFIC WORKS. READING ROOM OPEN DAILY, 136, GOWER STREET, LONDON, W.C. lurgical Laboratory. State qualifications. Address, Z. X., CHEMICAL NEWS Office, 16, Newcastle Street, Farringdon Street, London, E.C. PLATINUM Utensils. We supply all forms and sizes of Platinum Utensils and Apparatus for Chemical and Physical purposes. All our utensils are hammered to shape, tested, and finished in the best manner. All kinds of Platinum scrap bought for cash or taken in exchange for new.-DERBY and CO., Ltd. 44, Clerkenwell Road, London, E.C. T. TYRER & CO., Ltd, Stirling Chemical Works, STRATFORD, LONDON, E CHEMICALS for Analysis, Research, and Technical purposes. TECHNICAL EXPERIMENTS carried out on a MANUFACTURING SCALE. Inquiries solicited from INVENTORS and PATENTEES (especially Foreign) under the New Act, 1906. Offices: LEEDS. Cloth, 316; Paper covers, 216. (Postage, 4d. extra). THE WHEAT PROBLEM: Based on Remarks made in the Presidential Address to the British Association at Bristol in 1898. REVISED WITH AN ANSWER TO VARIOUS CRITICS By SIR WILLIAM CROOKES, F.R.S. SECOND EDITION. WITH PREFACE AND ADDITIONAL CHAPTER, BRINGING THE With Two Chapters on the Future Wheat Supply of the OPINIONS of the PRESS. "If these somewhat gloomy prognostications result in drawing the attention of chemists more seriously to what has hitherto been only an interesting laboratory problem, Sir William Crookes will have conferred an incalculable benefit on the race."-Western Morning News. "Sir William Crookes . . has propounded a problem which in the next century [written in 1899] is bound to engage the close attention not merely of agricultural experts, but of economists and statesmen."-Speaker. "The book is a useful one to all interested in the production of wheat both from the commercial and scientific points of view."-Knowledge. "Sir William Crookes's statistics seem to make good his alarmist statement."-British Weekly. "The fuller examination of the problem as here conducted hows that Sir William Crookes did not speak unadvisedly with his lips."-Yorkshire Post. "Sir William discusses at length the criticisms passed upon his address, and he appends valuable papers supporting his arguments on the future wheat supply of the United States."-Globe. "It is a vital question, and considering the cheap issue of the volume all interested in the feeding of the millions ought to get it and read it carefully."-Crieff Journal. "The appearance of the papers in this convenient form will be welcome to everyone who appreciates the importance of the problem."-Scotsman. "In the present volume Sir William Crookes replies vigorously to his critics."-Liverpool Daily Post. "The student of economic science and sociology will find this volume full of interesting material... The entire subject is of the profoundest interest, and an excellent purpose has been served by the publication of these papers in a single volume."-The Eagle (Brooklyn, N.Y.). Nov. 15, 1912 INSTITUTE of CHEMISTRY OF GREAT BRITAIN AND IRELAND. Founded 1877. Incorporated by Royal Charter 1885. 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Applications for the services of Professional Chemists should be forwarded to the Registrar, stating the requirements. To be obtained from HUGO LORENZ, "In his bulky volume Sir William reproduces the gist of 7-8, Idol Lane, Great Tower St., London, E.C., the sensational Bristol Address, and supplements it with carefully prepared answers to his chief critics and confirmatory chapters on the future wheat supply of the United States."-Morning Post. "The problem is one of importance, and Sir William Crookes presents it to us fortified by the opinions of two American experts."-Manchester Guardian. CHEMICAL NEWS OFFICE, 16, NEWCASTLE ST., FARRINGDON ST., E.C. MARTINDALE'S Licensed Trader in Alcohol and Spirits of Wine. Stock kept in suitable packages ready for immediate use. SULPHUROUS ACID and SULPHITES. Liquid SO, in Syphons, for Lectures, &a. PHOSPHORIC ACID and PHOSPHATES. Apparatus and Reagents CARAMELS & COLORINGS For Chemical and Bacteriological Research. 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