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Summary

If a very young leaf blade of Coleus bluinei Benth. is excised, the differentiation of primary xylem in the traces belonging to the treated leaf virtually ceases and all the cells in that half of the internode below the leaf are reduced in size. If the excised blade is replaced by auxin paste, differentiation of xylem proceeds almost normally and cell size is restored. Autoradiographs of sections of internodes treated apically with radioactive auxin paste indicate that after trans-location auxin is heavily concentrated in the vascular bundles.