SEPTEMBER 1950 Vol. 75, No. 894 THE ANALYST PROCEEDINGS OF THE SOCIETY OF PUBLIC ANALYSTS AND OTHER ANALYTICAL CHEMISTS BIOLOGICAL METHODS GROUP A MEETING of the Group was held at 2.15 p.m. on Tuesday, May 23rd, 1950, at the Medical Society of London, Chandos Street, Cavendish Square, London, W.l. The chair was taken by Dr. S. K. Kon. The subject of the meeting was “The Assay of Vitamin B1,”; after an introduction by the Chairman, the following papers were read and discussed: “Assays of Vitamin B,, in Man,” by C. C. Ungley; “Chick Assays,” by Miss M. E. Coates; “The Cup-Plate Assay of Vitamin B,,,” by W. F. J. Cuthbertson, J. T. Lloyd and H. F. Pegler; “Some Observations on the Cup-Plate Assay for Vitamin B,, using Lactobacillus lactis Dorner 10697,” by Frances E. Larkin and R.E. Stuckey; “The Assay of Vitamin B,, by the Turbidimetric Method using Lactobacillus Zeichmannii 313,” by W. B. Emery, K. A. Lees and J. P. R. Tootill; “A Com- parison of LnctobaciZZus Zactis Dorner and Lactobacillus leichmannii for the Assay of Vitamin B,, by a Test Tube Method,’’ by G. E. Shaw; “Experience with the Microbiological Assay of Vitamin B,, in an Analytical and Consulting Laboratory,” by H. Pritchard. About one hundred members and guests were present. PHYSICAL METHODS GROUP THE twenty-sixth Ordinary Meeting of the Group was held at 6.30 p.m. on Tuesday, May 23rd, 1950, in the Meeting Rooms of the Iron and Steel Institute, London. Mr. B. S. Cooper, the Chairman of the Group, was in the chair and about forty members and visitors were present. The following papers on Radio Chemistry in Analytical Chemistry were read and discussed : “Radiometric Assay in Tracer Research,” by F. P. W. Winteringham, A.R.I.C. ; “The Determination of Potash (in Fertiliser) by Measurement of its Radioactivity,” by D. S. Lees, B.A., A.Inst.P., W. Broomfield and H. N. Wilson, F.R.I.C. ; “Radioactivation Analysis-Some Glimpses of its Scope,” by A. A. Smales, B.Sc. DEATHS Eric Cecil Keeley Theodore Rendle. I’VE regret to record the deaths of 453