Optical Rotatory Power

Abstract

THE Faraday Society has adopted in recent years the policy of organising a series of general discussions on physico-chemical subjects, to which investigators of all countries are incited to contribute. The ninth of these discussions, on optical rotatory power, was held in the rooms of the Chemical Society on Friday, March 27. At the afternoon session the chair was occupied by Prof. Armstrong, who contributed an introductory address; the evening session was presided over by Prof. Frankland. Papers were read by Prof. H. Rupe, of Basle, on the influence of certain groups on rotatory power, by Prof. H. Grossman, of Berlin, on the rotatory dispersion of tartaric and malic acids, by Dr. T. M. Lowry and Mr. T. W. Dickson, on simple and complex rotatory dispersion, by Dr. T. M. Lowry and Mr. H. H. Abram on an enclosed cadmium arc for use with the polarimeter, by Dr. R. H. Pickard and Mr. Joseph Kenyon, on the rotatory powers of the members of homologous series, and by Dr. T. S. Patterson, on the dependence of rotation on temperature, dilution, nature of solvent, and wavelength of light. Papers were also communicated by Prof. L. Tschugaeff, of St. Petersburg, on anomalous rotatory dispersion, by Dr. E. Darmois, of Paris, on the existence of racemic tartaric acid in solution, by Dr. G. Bruhat, of Paris, on the rotatory power of tartaric acid, and by Prof. A. Cotton, of Paris, on the constitution of liquid mixtures and their rotatory power.