J O U R N A L OF THE CHEMICAL SOCIETY. TRANSACTIONS. A. CHASTON CHAPMAN. A. W. CROSSLEY C.M.G.,D.Sc.,F. R.S. SIR JAMES J. DOBBIE MA. D.Sc., M. 0. FOIISTER n.Sc. Ph.D. F.R.S. T. A. HENRY D.Sc. J. T. HEWITT M.A. D.Sc. PIi.D., F. R.S. F.R.S. C. A. KEANE D.Sc. Ph.D. T. M. LGWRY O.B.E. D.Sc. F.R.S. G. T. MORGAN D.Sc. F.R.S. J. C. PHILIP O.B.E. D.Sc. Ph.D. A. SCOTT M.A. D.Sc. F.R.S. S. SMILES 0. B.E. D.Sc. F. R.S. J. F. THOILPE C.B.E. D.Sc. Ph.D., F. R.. S. $bitor : J. C. GAIN D.Sc. 58 I1 b- Mt ax : A. J. GILEENAWAY. 2Jrjaiattrnt sub-Qbitar : CLARENCE SMITH D.Sc. 1919. VOl. cxv. LONDON: GURNEY & JACKSON 33 PATERNOSTER ROW E.C. 4. 19 19 PRINTED IN GREAT BRITAIN BY REWARD CLAY & SONS LIMITED, BRUNSWICK ST. STAMFORD RT. S.E. L AND BUNGAY.SUFFOLK J O U R N A L OF THE CHEMICAL SOCIETY. TRANSACTIONS. A. CHASTON CHAPMAN. A. W. CROSSLBY C.M.G. D.Sc.,F.R.S. SIR JAMES J. DOBBIE M.A. D.Sc., M. 0. FORSTER D.Sc. Ph.D. F.R.S. T. A. HENRY D.Sc. J. T. HEWITT M.A. D.Sc. Ph.D., P.R.S. F.R. S. C. A. KEANE D.Sc. Ph.D. T. M. LOWRY O.B.E.,D.Sc. F.R.S. G. T. MORGAN D.Sc. F.R.S. J. C. PBILIP O.B.E. D.Sc. Ph.D. A. SCOTT M.A. D.Sc. F.R.S. S. SMILES O.B.E. D.Sc. F.R.S. J. F. THORPE C.B.E. D.Sc. Ph.D., F. R. S. @bitox : J. C. CAIN D.Sc. Snb-Qbitm : A. J. GREENAWAY. $j*ssij*strrtrt Snb- fibitax : CLARENCE SMITH D. Sc. 1919 Vol. CXV. Put I. pp. 1-712. LONDON: GURNEY dz JACESON 33 PATERNOSTER ROW E.C. 4. 1919 PRINTED IN QRRAT BRITAIN RY RICHARD CLAY & SONS LIMITED, RRUNSfICK ST.STAMFORD ST. S.E. 1, AND BUNOAY BUFFOLK CONTENTS. PAPERS CO.MMQNICATED TO THE CHEMICAL SOCIETY. PAGE THE Conception of the Chemical Elemeut as Enlarged by the Study of Radioactive Change. A Lecture delivered before the Chemical Society on December 19 th 19 18. By FREDERICK SODDY . . . I 1.-The Dilution Limite of Inflfimmability of Gasecjus Mixtnreg. Part 111. The Lower Limits of some Mixed Inflammable Gases with Air. Part IV. The Upper Limits of some Gases Singly and Mixed in Air. BY HUBERT FRANK COWARD CHARLES WILLIAM CARPENTER and WILLIAM PATMAN . . 27 11.-The Propagation of Flame through Tulm of Small Dia-meter. Part 11. By WrLLIAbf PAYMAN and RICHARD VERPI'ON WHEELER . . 36 111.-Mixtures of Nitrogen Peroxide and Nitric Acid.By WILLIAM ROBERT BOUSFIELD K.C. . . 45 1V.-The Effect of Dilution in Electro-titrimetric Analyses. By GILBERT ARTHUR FREAK . . 55 V.-The Optically Active Neomethylhydrindamines. By (the late) LT. JOSEPH WALTEB HARRIS . . 61 V1.-Chromatocobaltirmmines By SAMUEL HENRY CLIFFORD BRIGGS . . 67 VI1.-Glyceryl Methyl Ether Dinitrate (a-Methylin Dinitrate). By DAVID TREVOR JONES . . 76 VII1.-The Inflammation of Mixtures of Ethane and Air in tl Closed Vessel The Effects of Turbulence. By RICHARD VERHON WHEELER . . . . 81 1X.-The Ignition of Explosive Gases by Electric Sparks. By JOEN DAVID &RGAN . . 94 X.-The Physicd Constants of Nicotine. Part I. Specific Rotatory Power of Nicotine in Aqueous Solution. By HARRY JEPHCOTT . 104 XI.-The Sub-acetate and Sub-sulphate of Lead.By HENRY GEORGE DENHAM . . 109 XI[.-The Synthesifi of Ammonia at High Temperatures. Part 111. By EDWARD BRADFORD MAXTED . 113 XIIT.-The Effect of some Simple Electrolytes on the Tempera-ture of Maximum Density of Water. By ROBERT WRIGHT 119 X1V.-Polar and Non-polar Valency. By RAJENDRALAL 1h . 127 XV.-The Interaction of Stannous and Arsenious Chlorides. By I~EUINALD GRAEAM DURRANT . . 13 i V CONTENTS. XV1.-Experiments on the Elimination of the Carbethoxyl Group from the Tautomeric Systems. Part I. Derivatives of Indene. By CHRISTOPHER KELK INGOLD and JOCELYN FIELD THORPE . . 143 XVI1.-The Preparation of Monomethylamine from Chloro-picrin. By PERCY FARADAY ERANKLAXD FREDERICK CHALLENGER and NOEL ALBERT NICHOLLS . . 159 XVII1.-The Alkaloids of Holarrhena congolensis Stspf.By FRANK LEE PYMAN . . . . 163 X1X.-Meta-substituted Aromatic Selenium Compounds. By FRANK LEE PYMAN . . 166 XX.-The rt-Butylarylamines. Part 111. Constitution of the Nitro-derivatives of n- Butyl-p-toluidine. By JOSEPH REILLY and WILFRED JOHN HICKINBOTTOM . . 175 XXL-Studies in Catalysis. Part X. The Applicability of the Radiation Hypothesis t o Heterogeneous Reactions. By WILLIAM CUDMORE MCCULLAGE LEWIS . . 182 XX1I.-The Estimation of the Methoxyl Group. By JOHN THEODORE HEWITT and WILLIAX JACOB JONES . 193 XXII1.-The Preparation of Monomethylaniline. By PERCY FARADAY FRANKLAND FREDERICK CHALLENGER and NOEL ALBERT NICROLLS . . 198 XX1V.-Equilibria in the Reduction of Oxides by Carbon. By ROLAND EDGAR SLAUE and GEOFFREY ISHEEWOOD HIGSON .205 XXV.-The Dissociation Pressures of some Nitrides. By ROLAND EDGAR SLADE and GEOFFREY ISHERWOOD HIGSON . 215 XXV1.-Nitro- Ary1:tzo- and Amino-glyoxalines. By ROBERT GEORGE FARGHER and FRANK LEE YYMAN . . . 217 XXVT.1.-Mercury Mercaptide Nitrites and their Reaction with the Alkyl Iodide. Part IV. Chain Compounds of Sulphur (cqntinued). By PRAFULLA CHANDRA RAY and PRAFULLA CHANDRA GUHA . . 261 XXVII1.-The Reaction between Sodium Chloride Solution and XX1X.-The Theory of Duplex Affinity. By SAMUEL HENRY CLIFFORD BRIQGS . 278 XXX.-Curcumin. By PRAPHULLA CHANDRA GHOSK . 292 XXX1.-The Rotatory Dispersive Power of Organic Com-pounds. Part IX. Simple Rotatory Dispersion in the Terpene Series. By THOMAS MARTIN LOWRY and HAROLD HELLING ABEAM .. 300 By SAMUEL JUDD LEWIS . . 312 PAGE Netallic Magnesium. By WILLIAM HUGHES . . 272 XXXI1.-A New Sector Spectrophotometer CONTENTS. V PAGE XXXIII. -The Formation and Stability of spiro-Compounds Part 11. Bridged-spi7.o-compounds Derived from cyclo-Hexane. By CHRISTOPHER KELK INGOLD and JOCELYN FIELD THORPE . ANNUAL GENERAL MEETIXG . PRESIDENTIAL ADDRESS . OBITUARY NOTICES . XXX1V.-Porphyroxine. By JITENDRA NATH KAESHIT . XXXV.-Coagulation of Metal Sulphide Hydrosols. Part I. Influence of Distance between the Partieles of a Sol on its Stability. Anomalous Protective Action of Dissolved Hydrogen Sul phide. By J~~ANENDRA NATH MUKHERJEE and NAJENDRA NATH SEN. . XXXVL-A Simple Form of Apparatus for Estimating the Oxygen Content of Air from the Upper Atmosphere.By FRANCIS WILLIAM AsTos . XXXVI1.-The Resolution of Hyoscine and its Components, Tropic Acid and Oscine. By HABOLD KING . XXXVII1.-The Basic Properties of Oxygen in Organic Acids and Phenols; and' the Quadrivalency of Oxygen. By JOSEPH KNOX and MARION KNOX RICHARDS XXXIX.-+-l 8-isoNaphthoxazones. By BIMAN BIHARI DEY and MAHENDRA NATH GOSWAMI . XL.-Mercury Mercaptide Nitrites and their Reaction with the Alkyl Iodides. Part V. Chain Compounds of Sulphur (continued). By SIR PRAFIJLLA CHANDRA RAY and PJ~AFULLA CHANDRA GUHA . . 0 XLI.-Mercury Mercaptide Nitrites and their Reaction with the Alkyl Iodides. Part VP. Chain Compounds of Sulphur (continued). XLIL-Nerctwic Sulphoxychloride. By SIR PRAFCLLA CIIANDRA RAY and PRAFULLA KUMAR SEN .XLII1.-The Preparat ion of Cadmium Suboxide. Ey HEXRY GEORGE DENHAM . . XL1V.-Formation of Diphenyl by the Action of Cupric Salts on Organornetallic Compounds of Magnesium By JACOB RRIZEWSKY and EUSTACE EBENEZER TURNER OBITUARY NOTICE . . . . . XLV.-Studies on the Dependence of Optical Rotatory Power on Chemical Constitution. Part I. Position-Isomerism and Optical Activity of Naphthylihinocamphors and Deriva-tives of Phenyliminocamphor . By BAWA KARTAR SINGH and JATINDRA KUMAR MAZUMDER . XLV 1 .-The Nitration of Dipheriylethylenediamine. Ey GEORGE . By SIR PRAFULLA CHANDRA RAY . . nr.4CDONALD BEENETT . . 320 384 397 408 455 461 472 4'76 508 53 1 541 548 55'3 556 559 56 2 566 57 Vi CONTENTS XLVI1.-The Propagation of Flame in Mixtures of Acetylene and Air.By WALTER MASON and RICHARD VERNON WHEELER . . 578 XLVII1.-The Preparation of Diacetonamine. By ARTHUR ERNEST EVEREST . . 588 XL1X.-The Constitution of Maltose. A New Example of Degradation in the Sugar Group. By JAMES COLQUHOUN IRVINE and JAMES SCOTT DICK . * 593 L.-Catalytic Racemisation of Ethyl I-Mandelatos. By ALEX. MCKENZJE and HENRY WREN . . 602 L1.-The Potential of a Nit+ogen Electrode. By FRANCIS LAWRY USHER and RAMAVENKATASUBBIER VENKATESWARAN . . 613 LI1.-A Chemical Investigation of Banded Bi tuminoiis Coal. Studies in the Composition of Coal. By FREDERICK VINCENT TIDESWELL and RICHARD VERNQN WHEELER . . 619 LII1.-The Rotation-dispersion of Butyl Heptyl and Octyl Tartrates.By PEricy FARADAY FRANKLAND and FREDERIC HORACE GAEKER . . 636 L1V.-The Tannin of the Canadian Hemlock (Tszrya cunudensis, Carr). By RODGER JAMES MANNING and MAXrMILrAN NIERENBTEIN . . 662 LV.-The Formation of Dinzonmino-compounds from P-Nsphthyl-amine. Ey GEORW MARSHALL NORMAN . . 673 LTfI.-The Chemistry of the Glutaconic Acids. Part XI. The Occurrence of 1 3-Addition to the Normal Form. By JOCELYN FIELD THORrE . . 679 LVI1.-The Formation and Reactions of Imino-compounds. Part XIX. The Chemistry of the Cyanoacetamide and Guareschi Condonsntions. By GEORGE ARMAND ROBERT KON and JOCELYN FIELD THORPE . . 686 LVII1.-"Blue John" and other Forms of Fluorite. By BERTRAM BLOUNT and JAMES HARRY SEQUEIRA . . 705 L1X.-Studies in Catalysis. Part XI. The Le Chstelier-Braun Principle from the Point of View of the Radiation Hypo-thesis.By WILLTAM CUDMORE MCCULLAGH LEWIS . . 710 LX.-Cryptopine. Part 11. By WILLIAM HENRY PERKIN jun. 713 LX1.-The Freezing Point of Solutions with Special Reference to Solutions Containing Several Solutes. By CHARLES EDWARD FAWSITT . . 790 LXI1.-The Use of Freezing-point Determinations in Quantita-tive Analysis. By CHARLES EDWARD FAWsrTT . . 801 LX1II.-The Constitution of the Disaccharides. Part 111. Maltose. By WALTER NORMAN HAWORTH and GRACE CUMMING LJCITCH . . 809 PAG CONTENTS. vii PAGE LX1V.-Condensation of Deoxybenzoin and Aldehydes. By ANANDA KISORE DAS and BROJENDRA NATH GHOSH LXV.-Condensation of Deoxybenzoin with Aromatic Aldehydes. By BAWA KARTAR SINGH and JATINDRA KUMAR MAZUHDER .LXVI. -Trustworthiness of the Balance ovar Long Periods of Time. By GEORGE DEAN . LXVI1.-The Isomeric Tropic Acids. By ALEX. MCKENZIE and JOHN KERFODT WOOD . . LXVIIL-The Absorption Spectra of the Nitric Esters of Glycerol. By HARRY HEPWORTH . LX1X.-The Interaction of Acetylene and Mercuric Chloride. By DAVID LEONARD CHAPMAN and WILLIAM JOB JENKINS . LXX.-The Basic Properties of Phenanthraquinone. By JOSEPH KNOX and HELEN REID WILL . LXXI.-The Solubility of Silver Acetate in Acetic Acid and of Silver Propionate in Propionic Acid By JOSEPH KNOX and HELEN REID WILL . A Lecture Delivered By JOHN The Quantum Theory and New Theories of Atomic Structure. A Lecture Delivered before the Chemical Society on May lst, 1919. By JAMES HOPWOOD JEANS ..1,XXII.-Interaction of Mercuric and Cupric Chlorides Respec-tively and the Mercaptans and Potential Mercaptans. By Sir PRAFULLA CHANIIRA RAY . . . ANNUAL REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS . . LXSII1.-The Presence of Aconitjc Acid in Sugar-cane Juice and a New Ileaction for the Detection of the Acid. By CHARLES SOMERB TAYLOR . LXX1V.-Studies in the Camphane Series. Part XXXVII. Aryl Derivatives of Imino- and Amino-camphor. By MARTIN ONSLOW FORSTER and HANS SPINNER LXXV.-The Oxidation of Coal. By FREDERICK VINCENT TIDESWELL and RICBARD VERNON WHEELER LXXV1.-The Catalytic Reduction of Hydrogen Cyanide. By SYDNEY RARRATT and ALAN FRANCIS TITLEY . LXXVIL-The Chemistry of Butpindy Mixtiires. By ROBERT LUDWIG MOND and CHRISTIAN -HEBERLEIN LXXVII1.-Examination of the Bark of Croton gzcbouga.Isola-tion of 4-Hydroxyhygric Acid. By JOHN AUQUSTUS GOODSON and HUBERT WILLIAM BENTLEY CLEWER . LXX1X.-Hnrmine and Harmaline. Part 111. By WILLIAM HENRY PERKIN jun. and ROBERT ROBJNSON . Emission Spectra and Atomic Structure. before the Chemical Society on March 6th 1919. WILLTAM NICHOLSON . 4 . . . . 817 821 826 828 840 847 850 853 855 865 871 879 886 889 89 5 902 908 923 93 ... V l l l CON’I’ENTS. LXXX.-€Earmine and Harmaline. Part IV. BY WILLIAM LXXX1.-A New Photographic Phenomenon. By DONALD LXXXI1.-The Stereochemistry of Hyoscine. By HAROLD LXXXII1.-Substituted Phenylarsinic Acids and their Reduc-tion Products and the Estimation of Arsenic in such Cornpounds.By ROBERT GEORGE FARGHER . . 982 LXSX1V.-The Selective Combustion of Carbon Monoxide in Hydrogen. By ERIC KEIGHTLEY RIDEAL . . 993 LXXXV.-The Temperature of Explosion for Endothermic Substances. By RASIR LAL DATTA and NIHAR BANJAN CHATTERJEE . . 1006 LXXXV1.-The Preparation of Buty-lamine and of n-Dibutyl-amine. The Separation of Aliphatic Amines by Partial LXXXVI1.-The Abnormal Behaviour of Glyoxalinecarboxylic PAGE HENRY PEHKIN jun. and ROBERT ROBINSON . . 96‘5 NEIL MCARTHUR and ALFRED WALTER STEWART . 973 KING . . 974 Neutralisation. By EMIL ALPHOSSE WERNER . . 1010 Esters and Anilides towards Diaxonium Salts. By ROBERT GEORGE FARGHER and FRANK LEE PYMAN . . 1015 LXXXVIIL-The Free Energy of Dilution of Aqueous Sodium Chloi-ide Solutions.By ARTHUR JOHN ALLMAND and WILFRID GUSTAV POLACK . . 1020 LXXX1X.-The Active Substance in the Todination of Phenols. By VICTOR COFMAN . . 1040 XC.-The Influence of Hydrogen Sulphide on the Occlusion of Hydrogen by Palladium. By EDWARD BRADFORD MASTED . 1050 XCI .-The Critical Solution Temperature of EL Ternary Mixture as a Criterion of Purity of Toluene. By KENNEDY JOSEPH PREVITI~ ORTON and DAVID CHARLES JONES . . 1055 XCIL-Thiocyanoacetone and its Derivatives and Isomericles. By JOSEPH TCHERNIAC . . 1071 XCII1.-An Automatic Extraction Apparatus. By JOSEPH TCRERNIAC . . 1090 XC1V.-The Constitution of Carbarnides. Paat IX. The Inter-action of Nitrous Acid and Mono-substituted Ureas. The Preparation of Diazomethane,’ Diazoethane Diazo-n-butane, and Diazoisopentane from the Respective Nitroso-ureas.By EMIL ALPHONSE WERNER . . 1093 XCV.-Dyes Derived from Quinolinic Acid. By PRAPHULLA CHANDRA GHOSH . . 1102 XCV1.-Sodium Hypochlorite. By MALCOLM PERCIVAL APPLEBEY . . 1106 XCVI1.-Capsaicin. Part I. By ARTHUR LAPWORTH and FRANK ALBERT ROYLE . . 110 CONTENTS. ix PAGE XC V1II.-The Vapour Pressures and Densities of Mixtures of Acetone and Methyl Ethyl Ketone. By TUDOR WILLIAMS PRICE . . . 1116 XC1X.-The Constitution of Internal Diazo-oxides (Diazo-phenols). Part 11. By GILBERT T. MORGAN and ERIC DODDRELL EVENS . . 1126 C.-P-Naphthylmethylamine. By GILBERT T. MORGAN and FREDERICK PAGE EVANS . . 1140 CI.-Action of Phenylhydrazine on Phthalalclehydic and Phthalonic Acids Phen yl-hydrazo- and Azo-Phthalide.By PRAFULLA CHANDRA MITTER and JNANENDRA NATH SEN 1145 CI1.-Nercury Mercaptide Nitrites and their Reaction with the Alkyl Iodides. Part VII. Chain Compounds of Sulphur (contiw~wcl). By Sir PRAFULLA CHANDRA RAY and PRAFULLA CHANDRA GUHA . . . 1148 CII1.-Asymmetric Replacement in the meta-Series. Part I. By WILLIAM HENRY GOUQH and JOCELYN FIELD THORPE . 1155 C1V.-Molecular-weigh t Determination by Direct Measurement of the Lowering of the Vapour Pressure of Solutions. By ROBERT WRIGHT . . . . 1165 CV.-The Constitution of Carbamides. Part X. The Behaviour of Urea and of Thiourea towards Diazomethane and Diazo-ethane respectively. The Oxidation of Thiourea by Potass-ium Permanganate. By EMIL ALPRONSE WERNER . . 1168 CV1.-The Tannin of the Knopper Gall.By MAXIMILIAN NIERENSTEIN . . 1174 CVI1.-The Oxidation of Phenol Derivatives. By CYRIL NORMAN HTNSHELWOOD . . 1180 CVIT.1.-Chloropicrin. Part I. By JOHN ADDYMAN GARDNER and FRANCIS WILLIAM Fox . . 1185 CIX.-The Temperature of Critical Solution of a Ternary Mix-ture as a Criterion of Purity of m-Butyl Alcohol. The Preparation of pure n-Butyl Alcohol. By KENSEDY JOSEPH PREVITB ORTON and DAVID CHARLES JONES . . 1194 CX.-The Action of Grignard Reagents on the Esters of certain Dicarboxylic Acids. By HARRY HEPWORTH . . 1203 CXT.-The Melting Points of the Substituted Amides of the Normal Fatty Acids. By PHILIP WILFRED ROBE~TSON . 1210 CXI1.-The Effect of Sea-salt on the Pressure of Carbon Dioxide and Alkalinity of Natural Waters. By EDMUND BIXYDGES RUDHALL PRIDEAUX .. 1223 CXII1.-The Rate of Hydrolysis of Methyl Acetate by Hydro-chloric Acid in Water-Acetone Mixtures. By GEORGE JOSEPH BURROWS . . 123 X CONTENTS. CXIV. -The Velocities of Combination of Sodium Derivatives of Phenols with Olefine Oxides. Part 11. By DAVID RUNCINAN BOYD and DORIS FELTHAM THOMAS . . 1239 CXV.-Molecular Refractivity of Cinnaruic Acid Derivatives. By ERIC WALKER and THOMAS CAMPBELL JAMES . . 1243 CXV1.-The Determination of Ignition-temperatures by the Soap-bubble Method. By ALBERT GREVILLE WHITE and TUDOR WILLIAMS PRICE . . 1248 The Influence of Mass. By DAVID LEONARD CHAPMAN and JOHN REGINALD HARVEY WHISTON . . 1264 CXVII1.-Auto-complexes in Solutions of Cupric Chloride and Cupric Bromide. By STEWART BYRON WATE~N~ and HENRY GEORGE DENHAM .. . . 1269 By JAMES WILLIAM MCBAIN MARY EVELYN LAING and ALAN FRANCIS TITLEY . . 1279 CXX.-The Degree of Hydration of the Particles which Form the Structural Basis of Soap Curd Deterpined in Experi-ments on Sorption and Salting Out. By JAMES WILLIAM MCBAIN and MILLICENT TAYLOR . . 1300 CXX1.-Reaction of the Potassium Salts of 2-Thiol-5-thio-4-phenyl-4 5-dihydro-1 3 4-thiodiazole and 2 5-Dithiol-1 3 4-thiodiazole with Halogenated Organic Compounds. By PRAFULLA CHANDRA RAY PRAFULLA CHANDRA GUHA, and RADHA KISBEN DAS . . 1308. CXXI1.-Equilibria Across a Copper Ferrocyanide and an Amy1 Alcohol Membrane. By FREDERICK GEORQE DONNAN and WILLIAM EDWARD GARNER . . 1313 CXXII1.-The Colouring Matter of the Red Pea Gall By MAXIMILIAN NIERENSTEIN .. . . . 1328 CXX1V.-The Effect of Salts on the Vapour Pressure and Degree of Dissociation of Acetic Acid in Solution. An Experimental Refutation of the Hypothesis that Neutral Salts Increase the Dissociation Constants of Weak Acids and Bases. CXXV.-Some Ternary Systems containing Alkali Oxalates and Water. By ALBERT CHERBURY DAVID RIVETT and EDMUND ARTHUR O'CONNOR . . . 1346 CXXV1.-The Decomposition of Carbamide in the Presence of Nitric Acid. By TUDOR WILLIAMEI PRICE. . . 1354 CXXVI1.-Studies in Catalysis. Part XII. Catalytic Criteria and the Radiation Hypothesis. By M71LLIAM CUDNORE MCCULLAQH LEWIS . . 1360 CSXVII1.-Criteria of the Degree of Purity of Commercial Toluene. By JOHN SCOTT LUMSDEN. . . 1366 PAGE CXVI1.-The Interaction of Chlorine and Hydrogen.CXIX.-Colloidal Electrolytes Soap Solutions as a Type. By JAMES WILLIAM MCBAIN and JAMES KAM . 133 CONTENTS. xi PAGE CXX1X.-1 3-Bonzodiazolearsinic Acids and their Reduction Products. By ROBERT REGINALD BAXTER and ROBERT GEORGE FARGHER . . 1372 CXXX.-The Equilibrium between Carbon Hydrogen and Methane. By HUBERT FRANK COWARD and STANLEY PIERCE WILSON. . . 1380 CXXX1.-The Properties .of Ammonium Nitrate. Part I. The Freezing Point and Transition-temperatures. By REGINALD GEORGE EARLY and THOMAS MARTIN LOWRY . 1387 CXXXI1.-The Production of Methyl Ethyl Ketone from n-Butyl Alcohol. By ALBERT THEODORE KING . . 1404 CXXXIIL-Conversion of the Simple Sugars into their Enolic and Ethylene Oxide Forms. By EDWARD FRANKLAND ARMSTRONQ and THOMAS PERCY HILDITCH. . . 1410 CXXX1V.-The Constitution of the Nitroprussides. Part I. Conductivity and Cryoscopic Measurements. By GEORGE JOSEPH BURROWS and EUSTACEBENEZER TURNER . . 1429 CXXXV.-The Propagation of Flame in Complex Gaseous Mixtures. Part I. Limit Mixtures and the Uniform Movement of Flame in such Mixtures. By WILLIAM PAYMAN . . 1436 CXXXV1.-The Propagation of Flame in Complex Gaseous Mixtures. Part 11. The Uniform Movement of Flame in Mixtures of Air with the Paraffin Hydrocarbons. By WILLIAM PAYMAN . . 1446 aXXXVII.-The Propagation of Flame in Complex Gaseous Mixtures. Part 111. The Uniform Movement of Fhme in Mixtures of Air with Mixtures of Methane Hydrogen and Carbon Monoxide and with Industrial Inflammable Gases. CXXXVIIL-The Ignition of Ether-Alcohol-Air and Acetone-By ALBERT CXXX1X.-The Conductivities of Iodoanilinesulphonic Acids. By WILLIAM PAYMAN. . . 1454 Air Mixtures in Contact with Heated Surfaces. GREVILLE WHITE and TUDOR WILLIAMS PRICE . . 1462 BY MARY BOYLE . . 150