INTERNATIONAL UNION OF CRYSTALLOGRAPHY 2827

Orders or in a footnote to the title. Any paper in Acta Crystallo- graphica, Section A, or in Journal of Applied Crystallography Orders for Acta Crystallographica and Journal of Applied dealing with the crystal physics or the properties of a parti- Crystallography may be addressed to Munksgaard Interna- cular material should also include the approved name of the tional Publishers Ltd., 35 Norre Sogade, DK-1370 Copen- compound concerned. hagen K, Denmark. Orders from subscribers in North Advice on chemical nomenclature may be obtained from America may alternatively be placed through Polycrystal Dr K. L. Loening, Director of Nomenclature, Chemical Book Service, PO Box 11567, Pittsburgh, PA 15238, USA. Abstracts Service, PO Box 3012, Columbus, Ohio 43210, USA; and on the particular nomenclature of inorganic com- pounds from Professor Y. Jeannin, Laboratoire de Chimie Acta Cryst. (1979). B35, 2827 des M~taux de Transition, Universit6 Pierre et Marie Curie, 4 place Jussieu, 75230 Paris CEDEX 05, France. Enquiries Commission on Journals may also be addressed to Dr J. E. Derry, International Chemical Nomenclature Union of Crystallography, 5 Abbey Square, Chester CHI 2HU, England. The attention of authors submitting papers to Acta Crystallo- graphica and Journal of Applied Crystallography is directed to the requirement that chemical nomenclature should be (1979). B35, 2827 consistent, clear and unambiguous and conform to the rules Acta Cryst. of nomenclature established by the International Union of Pure and Applied Chemistry, the International Union of Report of the Eleventh General Assembly and Biochemistry and other appropriate bodies. For IUPAC International Congress of Crystallography rules, see Nomenclature of Inorganic Chemistry, Definitive Rules, 1970 (1971), London: Butterworths; Nomenclature The Report of the Eleventh General Assembly and Congress of Organic Chemistry, Sections AJ1,C,D,E,F & H, revised has been published in Acta Crystallographica, Section A ed. (1979), Oxford: Pergamon Press. Additional important [Acta Cryst. (1979). A35, 1021-10671. It includes the references include: inorganic boron compounds, IUPAC Inf. minutes of the General Assembly; the triennial reports of the Bull. (1970), No. 8; carbohydrates, IUPAC Inf. Bull. (1970), Executive Committee, the Commissions and the Union rep- No. 7; steroids, Pure Appl. Chem. (1972), 31, Nos. 1-2; resentatives on bodies not belonging to the Union; the Biochemical Nomenclature and Related Documents (1978), Statutes and By-Laws as amended by the Eleventh General London: Biochemical Society. An index to all IUPAC Assembly; membership of the Executive Committee and the nomenclature publications is available from the IUPAC Commissions; names and addresses of Union representatives Secretariat, Bank Court Chambers, 2-3 Pound Way, on other bodies; a list of Adhering Bodies and the member- Cowley Centre, Oxford OX4 3YF, England. French ship of National Committees for Crystallography, with versions of IUPAC rules for nomenclature of inorganic and names and addresses of the Secretaries. Reprints of the organic compounds are available from Le Secretariat, report will be sent to Secretaries of National Committees. Soci6t~ Chimique de France, 250 rue Saint-Jacques, Paris V, France; German versions from Verlag Chemie GmbH, Postfach 1260/1280, D-6940 Weinheim, Federal Republic of Germany; a Russian version of the organic rules only Acta Cryst. (1979). B35, 2827 from PIK VINITI, Oktyabrsky prospekt 403, Lyubertsy 140010, Moscovskaya oblast' 10, USSR. Report of the Executive Committee for 1978 Rigid and consistent conformance to these rules through- out a manuscript is not required but the approved names of The Report of the Executive Committee for 1978 has been compounds should be given at least once. In particular, all published in Acta Crystallographica, Section A [Acta Cryst. papers in Acta Crystallographica, Section B, reporting (1979). A35, 1068-1083]. It reports on the meetings and crystal structure determinations and all Crystal Data in publications of theeUnion, the work of its Commissions, Journal of Applied Crystallography should include the and the work of bodies not belonging to the Union on which approved name(s) of the compound(s) in the title of the paper the Unions is represented.