THE ANALYSIS OF SYNTHETIC DETERGENTS •59.7 the inorganic content of the precipitate can be calculated. The rest of the precipitate comprises the non-ionic surface active agent the content of which in the original solution is thus determined. An analysis of the precipitate is essential for every new type of non-ionic compound, because the value of x varies from one substance to another, and may even vary among com- pounds of nominally the same composition. Ml•. D. B^ss: Your method of analysis for ampho!ytics is to estimate as cationics under acid conditions. This method works well for the sub- stituted amino acid type, but do you obtain good results using the betaine type of ampholytic ? I am thinking in particular of difficulties when there is a degree of internal compensation within the molecule as with the cyclo- imidinium type. T}m LECTURER: Yes, we find our normal method for cationics to be satisfactory for the betaine type of surface active agent. The two-phase titration is performed in acid solution with chloroform as the organic phase, sodium dodecylbenzenesulphonate as titrant, methylene blue as indicator, and we take complete transference of colour to the organic phase as the end-point. BOOK REVIEW Standard Methods of Chemical Analysis. Volume II (A and B). INDUSTRIAL & NATURAL PRODUCTS & NONINSTRUMENTAL METHODS. Sixth Edition. Editor: F. J. Welcher. Part IIA--Pp. xiv q- (1-1282) q- Ill. Part IIB--Pp. xi q- (1283-2613) q- Ill. (1963). D. Van Nostrand Company, Inc., New York. $25 each (not sold separately). It is almost twenty-five years since a revised edition of Standard Methods of Chemical Analysis has appeared. In 1939, the Fifth Edition was published as two volumes but so great have been the modifications, refinements and developments of the methods of chemical analysis since that time that the Sixth Edition appears in three volumes, with Volume II expanded into two parts, bound separately as Volume IIA and Volume IIB. Despite its considerable expansion the purpose of Volume II remains that it shall be a collection of carefully selected well proved methods of technical analysis, of practical value to the professional chemist. The lay-out of this edition is similar to the previous one, but the expansion due to the inclusion of new material adequately reflects some of the important changes that have taken place in recent years in analytical techniques. The expansion includes chapters on standard laboratory apparatus detection of cations and anions mechanical separation separations by filtration separations by electrolysis solvent extraction separations by distillation and evaporation chromatography ion exchange methods in analysis acid-base titrations in non-aqueous solvents statistical interpretations quantitative organic analysis air pollutants amino acid analysis of protein hydroly- zates chemical analysis in clinical medicine fertilizers gas analysis with emphasis on vacuum techniques pesticides plastics silicates, glasses, rocks, soils and vitamins. There are numerous references to original papers and there is a good index at the end of Part B only. It is somewhat annoying that Part B has to be consulted for work that is known to be found in Part A, for these books are not lightweight ones. It is difficult to understand why the index was not included in Part A as well the book would only be 22 pages larger than Part B had this been done. Cosmetic chemists may be disappointed that the analysis of cosmetics does not

528 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS warrant its own section. In fact the nearest that a cosmetic product approaches such importance is in the section on Soaps and Detergents. Such neglect of the industry, however, does not detract from the value of this volume to the cosmetic analyst for although the products and materials of the so-called heavy industries are well covered, there is an overlap of cosmetic materials in other products. Such treatment makes for interesting reading and may well germinate new ideas in a harassed analyst. Apart from products, the section dealing with techniques and methods provides a large field from which to reap a rich harvest. T.J. BOWDITCH. THE SOGIETY OF GOSMETIG GHEMISTS OF GREAT BRITAIN Symposium on The Toxicology of Gosmetic Materials A sYMPOSiV• on The Toxicology of Cosmetic Materials will be held at the Town Hall, Leamington, Warwicks., on 10th and 20th November 1003. Participation is permitted only when application has been made on the appropriate form, and the fee duly paid. This is •3 3s. for each participant who is a member of one of the Societies of Cosmetic Chemists affiliated to the I.F.S.C.C. The registration fee for non-members is •0 Os. Registration forms, together with full details, can be obtained from the General Secre- tary, Mrs. E. Millman, 2 Lovers Walk, London, N.3. The closinl• date for applica- tions is 22rid October 1963. Programme Tuesday, 10th November 1003 20.00--22.00 Civic Reception by His Worship the Mayor of Leamington, at the Royal Pump Room, Leamington. (Informal dress.) Wednesday, 20th November 1963 Morning Chairman: A. HERZKA, Esq., Vice-President. 00.10 Welcome by His Worship the Mayor of Leamington, Councillor F. I. EATON, J.P. Opening of the Symposium by the President of the Society, S. J. BUSH, F.R.I.C. Esq. 00.25 "The duty of care and its implications". L. C. J. BRETT (Unilever Ltd., London). 10.00 "Accidental poisoning due to household products". R. GOULDING, B.Sc., M.D., B.S. (National Poisons Information Centre, Guy' s Hospital, London). 10.35 COFFEE. 10.55 "Inhalation and toxicity studies". H. GOMAHR, Dr. Phil., and H. J. KINKEL, Dr. Phil. (Batelie-Institute e. V., Frankfurt]Main, Germany). 11.30 "The assessment of safety-in-use: just how much is contributed by feeding studies in animals ?" L. GOLBERG, D.Sc., D.Phil., M.A., B.Chir., F.R.I.C. (The British Industrial Biological Research Association, London). 12.05 LUNCH. .driernoon Chairman: S. J. BUSH, Esq. 14.00 "Skin reactions to cosmetic preparations". P. D.C. KINMONT, M.D., M.R.C.P. (Consultant Dermatologist for Derby- shire Royal Infirmary). 14.85 "The need for rabbit skin studies in evaluating cosmetic safety". I. LEVENSTEIN, Ph.D. (Leberco Laboratories, Roselle Park, N.J., U.S.A.). 15.10 "The potential irritancy to the rabbit eye mucosa of certain commercially available shampoos". I. F. GAUNT, B.Sc., and K. H. HARPER, Ph.D., A.R.I.C. {Huntingdon Research Centre, Huntingdon). 15.45 Symposium ends, followed by TEA.