The extent to which tannin extract production is itself an agricultural operation is indicated and the distribution of tannins in the plant kingdom discussed. Present knowledge of the nature of the tannins is summarized and illustrated, by reference to specific extracts. The problem of the biological origin and function of tannins is discussed, particular reference being made to the effect of these substances on viruses. Brief mention is made of the effect of tannins on soils which they may disperse or aggregate to a marked extent.
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Theodore White (1957) studied this question.
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