SOCIETY OF COSMETIC CHEMISTS OF GREAT BRITAIN 49 . fall through an oil contained in a very wide tube. The mean time taken to fall through a distance of 25.0 cm was 11.3 sec. Given that the acceleration due to gravity is 981 cm sec -•' and that the density of the oil at the temperature of the experiment was 0.85 g cc -•, calculate the viscosity of the oil. Describe the drop-weight for the determination of surface tension. When a given volume of olive oil was dropped through a standard tip into a 0.001M NaOH solution, 44 drops were formed and the interfacial tension between olive oil and 0.001M NaOH was computed to be 7.3 dynes/cm. When the same volume of olive oil was dropped through the same standard tip into an aqueous solution 0.001M in NaOH and 0.1$M in NaC1, 300 drops were formed. Calculate the interfacial tension between olive oil and an aqueous solution 0.001M in NaOH and 0.1$M in NaC1. 10. Describe in detail a series of simple laboratory tests which can be used for subjective and objective assessment of cosmetic emulsions. SECTION F• 11. Write short notes on each of the following :- Dental caries. Enamel. Calculus. Denture cleansers. 12. Using diagrammatic flow curves distinguish between Newtonian, pseudo-plastic and thixotropic materials. State the factors which govern the viscosity of an emulsion and use mathematical expressions where possible to indicate their significance. Successful Candidates In the new course, eleven out of seventeen candidates were successful. In the old two-year course, five out of seven candidates were successful. Diplomas were awarded to the following: Miss (3. Bellamy Miss A. Coils J. S. Crombie C. D. Foley E, J, Fowler P. J. Hunt (3. Ibbott Miss J. M. Johnson Miss V. J. Lavin P, A, Mawbey Miss S, V. Peters B. Price W. W. F. Scotland K. B. Shipp Miss P. Vassalli Miss M, Woodward •5 prizes were awarded to Mr. W. W. F. Scotland (new course), and Miss ¾. J. Lavin {old course).

50 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS SOIRI•E The Society recently broke fresh ground by holding a Soiree on 10th November 105•, at the School of Pharmacy, Brunswick Square, London, W.C.1. The Soiree took place immediately prior to the Symposium on "Antioxidants and Preservatives," and was well attended by members and their friends and those participating in the Symposium. The Guest of Honour for the evening was Mr. R. W. Murphy, Immediate Past-Chairman of the Toilet Preparations Federation, who stood in at short notice for Mr. A. Stafford May, Chairman of the Toilet Preparations Federation. The Society's President and Mrs. Herzka with Mr. and Mrs. Murphy received the guests. Other guests included Dr. A. C. Bevan, Acting Head of the Chemistry Department, Brunel College, Dr. K. R. Capper, Pharmaceutical Society, Professor A. C. Frazer, Professor of Medical Biochemistry and Pharmacology in the University of Birming- ham, Dr. Frank Hartley, Dean of the School of Pharmacy and Mrs. Hartley, Professor E. Shotton, School of Pharmacy, Mr. J. B. Wilkinson, President of the International Federation of Societies of Cosmetic Chemists, and Mrs. Wilkinson, and Mr. V. H. Williams, High Sheriff of Merionethshire, and Mrs. Williams. During the course of the evening, 14 of the candidates who had been successful in the Society's 1064 Diploma Examinations were presented with their Diplomas. Miss V. J. Layin and Mr. W. W. F. Scotland were awarded •5 prizes for the best results in these examinations, The rest of the evening was taken up with dancing and with an interesting and amusing interlude arranged by Max Factor, and presented by Miss E. Gardiner. The Soiree provided a pleasantly informal occasion for members and their friends to meet, and it is expected that it will become a regular feature in the Society's calendar. Symposium on "PRESERVATIVES AND ANTIOXIDANTS" A Symposium on "Preservatives and Antioxidants" organised by The Pharmaceutical Society of Great Britain and The Society of Cosmetic Chemists of Great Britain took place on Tuesday, 17th November 10134, at The Connaught Rooms, Great Queen Street, London, W.C.2. It was attended by 258 participants, including delegates from Germany, Holland, Japan, Switzerland and the U.S.A.