Botanical Gazette Volume . 19 by Jstor
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Author: Jstor
Page Count: 200 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Type: eBook
ISBN: 9781232265870
Download Link: Botanical Gazette Volume . 19
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ... known than his fellow botanists and the editor of the Jahresbericht have. Nevertheless, most botanists will do nothing at all for spreading abroad their articles, but depend entirely on the staff of the Jahresbericht or of other periodicals of similar character.--E. Kcehne, Fricdeiiau bet Berlin, Kirchstr, 3. On compass plants and twisting of leaves. If it be permitted, I would like to present a few remarks concerning the nature of the torsions in the leaves of the so-called compass plants. These torsions were described as twisting by Mr. Meehan (supra, pp. 158-159). The leaf-movements in the compass plants are, for good reasons, interpreted as heliotropical torsions. Now, Mr. Meehan states that these torsions result from "a somewhat prolonged effort of spiral growth." Mr. Meehan has, evidently, confounded different movements. Having had some experience with compass plants, I shall be ab e, I think, to explain Mr. Meehan's results. The question is very simple, and belongs to the elements of vegetable physiology. I. Compass plants. Experiments (the literature was given in my article on this subject in the Deutsche Botanische Monatsschrift 11: 1. 1893) have demonstrated that (1.) The vertical position of the leaves is assumed only when the plant is growing fully exposed to the sunlight. (2.) When the plant is growing in the shade, the leaves assume the fixed light-position. (3.) When the plants are so situated that they receive only the oblique rays of either the morning or the evening sun, the leaves place their superior surfaces at right angles to the incident rays. (4.) When the plants are under such circumstances that they receive the sun's rays only when the sun is high in the heavens, the leaves present their superior surfaces to the incident...
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