METRICATION UNITS ALLOWED IN CONJUNCTION WITH SI physical quantity name of unit symbol for unit definition o.t unit length parsec pc 30.87 X 10 • m area barn b 10 -28 m 2 hectare ha 104 m 2 volume litre 1 10 -• m 3 pressure bar bar l0 s N m -2 mass tonne t l0 s kg = 1 Mg kinematic viscosity stokes St 10 -4 m 2 s -• diffusion coefficient dynamic viscosity poise P 10 -• kg m -• s -• magnetic flux density gauss G 10 -4 T {magnetic induction) radioactivity curie Ci 37 X 109 s -• energy electronvolt eV 1.6021 X 10 -•9 J time hour h EXAMPLES OF UNITS CONTRARY TO SI, WITH THEIR EQUIVALENTS • physical quantity unit equivalent length angstr6m 10 -•ø m inch 0.0254 m foot 0.3048 m yard 0.9144 m area square inch 645.16 mm 2 square foot 0.092 903 m 2 square yard 0.836 127 m 2 volume cubic inch 1.638 71 x 10 -s m 3 cubic foot 0.028 316 8 m • U.K. gallon 0.004 546 092 m • U.S. gallon 0.008 785 41 m • fluid ounce 28.413 1 cm • mass pound 0.453 592 37 kg ounce 28.349 $ g dram 1.771 85 g grain 64.798 9 mg 2.767 99 x 104kgm -• density pound/cubic inch pound/cubic foot 16.0185 kg m -• concentration ounce/gallon 6.236 02 g 1 -x force dyne 10- • N poundal 0.138 23• N pound-force 4.448 22 N kilogramme-force 9.806 65 N pressure atmosphere 101.325 kN m -2 tort 133.322 N m -2 pound (f)/sq.in. 6894.76 N m -2 ---- 6.894 76 kN m -2 inch of mercury 3386.39 N m -2 energy erg 10-? ] therm 105.506 MJ calorie (I.T.) 4.1868 J calorie (15øC) 4.1855 J calorie (thermochemical) 4.184 J B.t.u. 1055.06 J = 1.055 06 kJ foot poundal 0.042 140 1 J foot pound (f) 1.355 82 J power horse power 745.700 W----0.745 700 kW temperature degree Rankine 0 • øK degree Fahrenheit t/øF-----{T] øCq- 32 * Fuller lists are to be found in Anderton, P. and Bigg, P. H. Changing to the metric system. 2nd edn. {1967). {H.M. Stationery Office, Londo,l 75

76 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS GENERAL NOTICES Publication dates: The "Journal of the Society of Cosmetlo Chemists" is published every four weeks. Five Issues for the Society of Cosmetic Chemists of Great Britain by Pergamon Press Ltd., Headington Hfil Hall, Oxford, England. Six issues by the Society of Cosmetic Chemists from 6220 Kansas Avenue, N.E., Washington, D.C.20011, U.S.A. Two issues for the Gesellsehaft Deutseher Kosmetlk-Chemiker, e.V. by Dr. Alfred Hõthlg Verlag, Wilkenstrasse 3-5, Heidelberg, Germany. Issue No. Publication Date Country of Origin 1 8th January Great Britain 2 5th February U.S.A. 3 4th March U.S.A. 4 1st April Great Britain 5 29th April Germany 6 27th May U.S.A. 7 24th June Great Britain 8 22rid July Great Britain 9 19th August U.S.A. I0 16th September U.S.A. 11 14th October Great Britain 12 1 lth Novembor Germany 13 9th December U.S.A. Advertisements: All enquiries regarding advertisements in the British Editions of tho Journal should be addressed to Mr. E. J. Byfield, Pergamon Press Ltd., 345-350 Gray's Inn Road, London W.C. 1. Subscription: All members of the Society of Cosmetic Chemists of Great Britain receive one copy of each edition free. Further copies at non-member rates. Industrial and non- member subscribers: •21. Non-profit institutional subscribers: •14 per annum, post free. Single issues: 42s, post free. Missing numbers: Journals are despatohed at Printed Paper rate. Claims for missing numbers oan be entertained only from subsoribers In the oountry of origin of the partioular issue, and must be made within 80 days from date of Issue. Members and subscribers are urged to give notice of change of address to the Publication Offices. Responsibility for statements published: The Society of Cosmetic Chemists of Great Britain and its Hon. Editor assume no responsibility for statements or opinions advanced by con- tributors to this Journal. Lectures: The Society shall have the right of first publication of any lecture or address deliv- ered before it, but does not undertake to publish any given matter. Copyright: Reproduction of synopses, duly credited to the authors and TH• JOURNAL OF Ta•- SOCX•-T¾ OF COSM•-TIC CaEXiXSTS, is permitted. Digests of articles not exceeding 400 words may be published, duly credited to the author and TH• JouRnAl- oF TH• SocmT¾ o• Costar-Tin Cn•mSTS. Reprinting or extensive copying (whole pages or articles) is forbidden, except by special permission in writing, from the Hon. Editor. Any republica- tion must indicate the source of the original paper. The copyright of all papers published in the British Editions belongs to the Society of Cosmetic Chemists of Great Britain. Authors must obtain written permission from the copyright holder to reproduce illustra- tions or quotations from other sources. Photocopying in libraries: Attention is drawn to the provisions of the Copyright Act 1956, part 1, section 7, whereby a single copy of an article may be supplied, under certain conditions, for the purposes of research or private study, by a library of a class prescribed by Board of Trade regulations (Statutory Instruments, 1957, No. 868). Multiple copying of the contents of this Journal without permission is illegal but terms may be negotiated with the publisher. Manuscripts: These should be in accordance with the "Directions for preparation of manu- scripts," copies of which are available from the Hon. Editor, Ashbourne House, Alberon Gardens, London, N.W. 11.