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The exudates from seven Acacia species, not hitherto studied chemically, have been examined. As a result, variation in the characterisiic features of the Acacia group of plant gums can now be discussed from a more representative viewpoint. Species considered previously to have atypical features (e.g., positive optical rotation or low rhamnose content) are now seen to occur almost as frequently as those with negative rotations and unit correspondence between the rhamnose and uronic acid content.,~LTHOC'GH several hundred , 4 cncia species are known botanically, only Acacia senegad (syn. ueifek), A . ~?aoldissinza,~ A . py~nantlaa,~ A . cq'anophyLla,5 A . karroo16 -4. catechzt,7 A. szmi?ra,8 and ,4. s e y d have been studied chemically to any extent; a few further species, e.g., A . leiuophloeal10 A . decwYens,ll ,4. avabiczcm,ll A . favnesiaiza,l2 and ,4. sieberiann l2 have been examined in minor detail, from some particular aspect. Table 1 summarises the general information available to date for comparative purposes.In the belief that general conclusions regarding the typical features of this large genus could not reasonably be based on such limited information, we sought

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Polyphenolic compounds were isolated from the pulp of three varieties of mangoes by ethyl acetate extraction. The compounds were separated by two-dimensional paper chromatography. The individual compounds were identified by Rf values, fluorescent behavior and degradation products. Gallotannin, m-digallic acid, gallic acid, unknown hydrolyzable tannin and mangiferin were identified. Phenolic compounds which are known to be responsible for astringency and browning in fruits were not detected by this extraction procedure.

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