Lectures On the Physiology of Plants

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That roots as well as shoot-buds appear at the basal end of a cut-off" leaf is explained, according to this view of the matter, simply by supposing that during the assimilatory activity of the leaf, and in accordance with its normal function, shoot-forming as well as root-forming substances are continually passing from the leaf through the petiole into the shoot-axis. If then the petiole is cut off, this customary movement proceeds no further, being, as in the case of cut-off pieces in general,... to a certain extent checked at the section, and buds as well as roots will grow out from the petiole near the section. These considerations then show that effective causes are given in the organisation and vital activity of the plant itself by which the places of origin of new roots and shoots are determined.
A second cause, however, has already become known to us in the examples quoted above ; this is the influence of gravitation, which, so far as we are as yet informed, affects different plants in very different degrees, in that new shoot-buds arise more easily in cut-off portions on the ends directed upwards, new roots on those directed downwards.


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