74 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Possible units represented by R: L--Ara!-- L--Am/' ,•. SL--Ara/-- ,8-c-Ara•' ? c--Ara/-- L--Afar' •- •---Araf -----,-- •---Ara/'-- ß ,•-L--Arap-•*,- L--Araf' -• L--Ara!-- a•-o-Galp •----• L-Ara/-- R' • ,8- o-Galp C[--L--Rhap Figure $ Possible structural fragment in Acacia senegal gum Reproduced from J. Chem. Soc. (C) 1959 (1966) not unlikely that, while plant gums differ in detail, they may be assembled on one or perhaps two common structural frameworks which are relatively simple" certainly appears to be an over-simplification. Despite the more rapid progress of fundamental study during the past five years, therefore, a long programme of work remains before our knowledge of the structure, function, and biosynthesis of such complex and fascinating natural products could be regarded as adequate. ACKNOWLEDGEMENTS These gum research studies could not have been undertaken without financial support from the Department of Scientific and Industrial Research the Science Research Council the Director of Forests, Sudanese Govern-

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