THE SOCIETY FOR ANALYTICAL CHEMISTRY Forthcoming Meetings-continued February Tuesday 22nd LONDON Wednesday 23rd LONDON Friday 25th PAISLEY SPECIAL TECHNIQUES GROUP on “Special Techniques in Gas Analysis.” Speakers B. Riley C. G. Scott R. T. Parkinson and R. E. Wilson. Wellcome Building Euston Road London N.W.l; 3 p.m. BIOLOGICAL METHODS GROUP. “Modern Techniques in the Bacteriological Examination of Food,” by Dr. Meeting Room of the Chemical Society Burlington House Piccadilly London Betty Hobbs. W. 1 ; 7 p.m. SCOTTISH SECTION. “Sources of Error in Weighing,” by R. A. Chalmers B.Sc. Ph.D. F.R.I.C. “The Balance Manufacturer Educator or Sycophant,’’ by M. V. Moorhouse. College of Technology Paisley; 7.15 p.m. January LONDON Wednesday 19th Thursday 27th LONDON Friday 28th GLASGOW Saturday 29th MANCHESTER February Tuesday 1st LEICESTER Wednesday 2nd LONDON Friday 11th TAUNTON Thursday 17th LONDON THE SOCIETY FOR ANALYTICAL CHEMISTRY Forthcoming Meetings MICROCHEMICAL METHODS GROUP Discussion Meeting jointly with the Associa- tion of Clinical Biochemists on “The Instrumental Measurement of Colour in Solution.” “The Feathers,” Tudor Street London E.C.4; 6.30 p.m.PLEASE NOTE that the date of this meeting is the 19th and not the 9th as advertised. AUTOMATIC METHODS GROUP. “Economics of Automatic Analysis.” London. SCOTTISH SECTION Annual General Meeting. Glasgow. NORTH OF ENGLAND SECTION Annual General Meeting. “Thermal Analysis,” by G. F. Longman B.Sc. F.R.I.C. Old Nag’s Head Hotel Lloyd Street Manchester ; 2.30 p.m. MIDLANDS SECTION jointly with the East Midlands Section of the Royal Institute of Chemistry and the Leicester University Students Chemical Society.“Operational Statistics in Analytical Chemistry,” by A. B. Calder B.Sc. Ph.D. D.I.C. F.R.I.C. “Applications of Statistics t o the Design of Analytical Experiments,” by F. H. Downton B.Sc. Ph.D. D.I.C. The University Leicester; 7 p.m. SOCIETY meeting on “Determination of Purity of High-purity Organic “Methods of Determining Purity in Use in the Chemical Standards Division of “Some Methods of Determining the Purity of Pharmaceutical Products,” by Meeting Room of the Chemical Society Burlington House Piccadilly London Materials.” N.P.L.,” by Dr. J. D. Cox. Dr. J. H. Chapman. W.l; 7 p.m. WESTERN SECTION. “Chromatography,” by G. Nickless B.Sc. Ph.D. Taunton ; 4.30 p.m. PARTICLE SIZE ANALYSIS GROUP Inaugural Meeting. “Estimation of the Surface Area of Fine Particles,” by N. G. Stanley-Wood. “Size Analysis by Optical Microscopy,” by G. L. Fairs. “Size Analysis with the Coulter Counter ; Comparison with Sedimentation and Surface Area Measurements,” by M. J. Thornton. Meeting Room of the Chemical Society Burlington House Piccadilly London W.l; 7 p.m. Continued inside back cover - PRINTED BY W. HEFFER & SONS LTD.. CAMBRIDGE ENGLAND.