The manuscript of this article was prepared for press just after the 9th International Botanical Congress in Montreal, during wich three half-days were devoted to problems of translocation. These discussions were most stimulating although perhaps not every aspect of the problem was equally well covered. Since most of the Congress reports are reviewed of Esau et al. (33). Occasional reference is made to older papers, either to relate current developments to past progress or to focus the reader's attention on older, little known foreign literature.

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