.... New Books: Animal Fats and Oils; Quantitative Chemical Analysis by Electrolysis; A Manual of Quantitative Chemical Analysis... 550 The Atomic Mass and Derivatives of Selenium. By Victor Lenher.. 555 Osmotic Pressure. By C. L. Speyers. Method of Preparing a Strictly Neutral Ammonium Citrate Solution. The Assay of Telluride Ores. By Charles H. Fulton.... On the Lindo-Gladding Method of Determining Potash. By A. L. Winton and H. J. Wheeler ....... .... The Specific Gravity of Sodium Chloride Solutions. By H. C. Hahn 621 A Short Study of Methods for the Estimation of Sulphur in Coal. Notes on Taka-diastase. By W. E. Stone and H. E. Wright ... 648 Lubricants for Glass Stop-cocks. By Francis C. Phillips....... Abstract of a Description of a Respiration Calorimeter Furnished by Professors Atwater and Rosa. By C. F. Langworthy...... Electrolytic Determination of Tin in Tin Ores. By E. D. Campbell Certain Alkaloidal Periodides, and the Volumetric Estimation of Al- kaloids as Higher Periodides. By A. B. Prescott and H. M. Gor- The Alkaline Reaction of Some Natural Silicates. By F. W. Clarke. 739 The Solubility of Salts by Weak Acids in Stronger Acids. By Arthur The Solubility of Acids in Solutions of the Salts of Other Acids. By Arthur A. Noyes and Edward S. Chapin.... The Color of Sulphur Vapor. By Jas. Lewis Howe and S. G. Hamner 757 The Formation of Alums by Electrolysis. By Jas. Lewis Howe and On Tetraphenylmethane. By M. Gomberg.... Hydrazo- and Azo-derivatives of Triphenylmethane. By M. Gomberg A Periodide of Triphenylbrommethane. By M. Gomberg. I. Metal Separations by Means of Hydrobromic Acid Gas. II. Indium II. Derivatives of the Tetrabromides of Zirconium and Thorium. By III. The Preparation of Zirconium Nitrides. By J. Merritt Matthews 843 IV. On the Separation of Iron from Zirconium and Certain Other New Books: A Brief Course in Qualitative Analysis; Alkaloidal Estimation; Traité d'Analyse des Substances Minérales; A Textbook of Elementary Analytical Chemistry, Qualitative and Volumetric; Lighting by Acetylene; A Short Course in Inorganic Qualitative Analysis for Engineering Students.. Books Received 889 897 DECEMBER. A New Gas. By Charles F. Brush.................. On the Facilities for Standardizing Chemical Apparatus Afforded by 899 912 927 935 948 Some Errors in the Determination of Nitrogen. By C. G. Hopkins. 961 965 Review: Some Records of the Year's Progress in Applied Chemistry 967 MA OF SOLUTIONS. BY L. M. DENNIS. Received November 10, 1897. ANY forms of dischargers for examining the spark spectra of solutions have been described, but all of those with which the writer is acquainted possess disadvantages that seriously impair their value. To prevent the spattering of the liquid upon the slit of the spectroscope the terminals are, in some cases, surrounded by a glass tube. If a spark of even moderate intensity be used, the liquid which is thrown against the walls of the tube soon cuts off most of the light and obscures the spectrum. It is then necessary to disconnect the discharger and to thoroughly clean the walls of the tube, an operation wasteful both of time and material. Others recommend that the glass tube be abandoned and that free terminals be employed. In this case it becomes necessary to place the spectroscope at some distance from the discharger to avoid the spattering of the liquid against the slit. Again, if the observations are at all prolonged, the liquid in the discharger is soon used up to such an extent that the lower terminal becomes too dry to give a brilliant spectrum. The discharger must then be refilled. These difficulties are obviated by the following device which we have been using for the past year. No striking originality |