10 GEL FILTRATION AND GEL PERMEATION [Proc. SOC. Analyt. Chem. Papers Accepted for Publication in The Analyst THE following papers have been accepted for publication in The Analyst and are expected to appear in the near future. “Determination of Specific Gravity and Concentration of Fruit Juice Concentrations and Other Viscous Concentrated Solutions,” by H. B. Basker. “A Rapid Method for the Production Control of the Non-ionic Component in Synthetic Detergents,” by B. M. Milwidsky. “A Rapid Method for Detection of Residual Lipase Activity in Oat Products,” by T. Kazi and T. J. Cahill. “Determination of Trace Metal Contaminants in a Wide Range of Varied Chemicals by Means of the Technicon AutoAnalyzer,” by W. S. Sebborn. “Charge-transfer Chromatography of Polycyclic Hydrocarbons,” by G.D. Short and R. Young. “The Spectrophotometric Determination of Cationic Surfactants with Picric Acid,” by I. Sheiham and T. A. Pinfold. “Effective Removal of Oxygen from Nitrogen Carrier Gas in Gas - Liquid Chromato- graphic Analysis,” by K. Voldum-Clausen. “Preparation and Spectral Characteristics of Microwave-excited Electrodeless Discharge Tubes for Palladium Silver Platinum and Gold,” by K. M. Aldous R. M. Dagnall and T. S. West. “The Determination of Trace Amounts of Tellurium by Inorganic Spectrofluorimetry at Liquid Nitrogen Temperature,” by G. F. Kirkbright C. G. Saw and T. S. West. January 19691 INTERNATIONAL CALENDAR 1969 11 “The Determination of Total Fluorine in Air by a Micro-diffusion Technique,” by B. S. “The Determination of Selenium in Plant Samples,” by R. J. Hall and P. L. Gupta. “A Field Method for the Determination of Organic Aromatic Isocyanates in Air,” by Marshall and R. Wood. D. W. Meddle D. W. Radford and R. Wood. The Preparation of Slides for Lectures Reprints COPIES of “The Preparation of Slides for Lectures,” reprinted from Proceedings November 1968 Volume 5 No. 11 pp. 222 to 227 are now available from the Society for Analytical Chemistry Book Department 9/10 Savile Row London W1X lAF Price 1s. 6d.