PRINCIPAL REFERENCES USED I N CHEMICALSOCIETY PUBLICATIONSA LIST of the principal references used in this and other Chemical Societypublications was given on page 557 of last year’s issue of Annual Reports.A similar list can also be found in each January issue of Current ChemicalPapers, in the Society’s ‘‘ Handbook for Chemical Society Authors ” andin the brochure “ Presentation of Papers.”Printed in Great Britain by But.ler & Tamer Ltd, Frome and Londo