File:Annual report of the Board of Regents of the Smithsonian Institution (1919) (14594945627).jpg

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Identifier: annualreportofbo1919smithso (find matches)
Title: Annual report of the Board of Regents of the Smithsonian Institution
Year: 1846 (1840s)
Authors: Smithsonian Institution. Board of Regents United States National Museum. Report of the U.S. National Museum Smithsonian Institution. Report of the Secretary
Subjects: Smithsonian Institution Smithsonian Institution. Archives Discoveries in science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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About This Book: Catalog Entry
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le bud, or sometimes two buds,situated next below the dead or dying part starts growing. (See pis.15 and 16.) The new growth of the stem is confined to the one or twobuds, just as was found to be the case with growth induced byinjury. My interpretation of the phenomenon is that as death ap-proaches the cell membranes become weakened in much the same wayas when chilled, the enzyme passes through into the starch storagecells, sugar is formed, and the adjacent bud begins to grow. Theprocess going forward here in a restricted portion of the stem, anddue to a local cause, is essentially the same as that taking placegenerally over the plant from a general cause when the plant ischilled. In the Tropics some plants are able to grow continuously, othersbecome dormant in the dry season and start into growth again at thecoming of the rainy season. Tropical plants probably have variousmethods of coming out of their dormancy, and there is every reason Smithsonian Report, 1919.—Coville. Plate 10.
Text Appearing After Image:
Dormant Wild Crab Stimulated to Growth by Pruning. This plant had remained dormant in the warm greenhouse during the fall and winter ata temperature of 55° to 70° F. On April 5 three branches were pruned, and on April24, when the photograph was taken, the uppermost bud on each of the prunedbranches had begun to grow. On other, unpruned plants no bud growth had takenplace. (Two-thirds natural size.) Smithsonian Report, 1919.—Coville. Plate II.

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1919
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30 July 2014
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