Melting Point Curve Research Articles

Societies and Academies

LONDON. Chemical Society, November 19.—Dr. J. Emerson Reynolds V.P.R.S., president, in the chair.—The "dynamic isomerism "of thiourea and ammonium thiocyanate. When the ammonium salt is heated, there is formed? definite compound of this with 25 per cent, of thiourea formed from it; further, melting-point curves of mixtures of these two substances show that other molecular combinations occur.—-Isomeric partially raeemic salts containing quinquevalent nitrogen; part 8, resolution of the hydrindamine camphor sulphonates, by Dr. F. S. Kipping. The author has confirmed the theory proposed by him in 1899 to account for the existence of these salts by the resolution of the partially raeemic salt into four isomerides. -The oxime of mes-oxamide and some allied compounds, by M.'A. Whiteley. A description of the disubstituted derivatives of mesoxamide, all of which possess the characteristic properties of furnishing yellow alkali salts and purple feirous compounds.—Interaction of ketones and aldehydes with acid chlorides, by F. H. Lees. When methyl w-nonylketone is acted upon by benzoyl chloride, there is formed benzoxyundecylene; this reaction has been extended to other ketones, and a series of benzoxyolefines so produced.—The synthesis of dimethylglutaric acid, hydroxy-aa dimethylglutaric acid, and of the cis- and trans- modifications - dimethylglutaconic acid, by Dr. W. H. Perkin and A. E. Smith.—A reaction of some phenolic colouring matters, by A. G. Perkin and C. R. Wilson. Potassium derivatives of a number of naturally occurring colouring matters have been prepared by interaction with potassium acetate.—Note on mixtures of constant boiling point, by Dr. S. Young. The composition of the mixture of carbon tetrachloride and methyl alcohol having the minimum boiling point is shown to contain 80 per cent, of the former.—The vapour pressures and boiling points of mixed liquids, part 2, by Dr. S. Young and E. C. Fortey. Part 3, by Dr. S. Young. An investigation of the formula proposed by the authors expressing the relation between the vapour pressure of the mixture and those of its constituents. Note on the condensation points of the thorium and radium emanations, by E. Rutherford and F. Soddy. When the emanations from thorium and radium compounds are passed through a copper spiral immersed in liquid air, they are condensed and retained in the copper tube and are volatilised when the tern perature is raised to - 1250 in the case of thorium emanation and to - 1300 in the case of radium.—Note on the action of barium hydroxide on dimethylvioluric acid, by M. A. Whiteley. The principal product of this action is isonitrosomalondimethyU amide.—The determination of strychnine and brucine in nux vomica, by E. Dowzard. The brucine is determined by colori-metric estimation of the tint produced by the solution of tha alkaloidal residue in nitric acid.