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. 1912 Excerpt: ...will from time to time come in contact with the support, and by the tensions which will thus result the curvatures become "permanent" coils. Geotaxis.--In some lower organisms an influence of gravity on changes of position has been shown to exist. This fact can only be mentioned here. (c) Chemical Stimuli In the same ...
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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. 1912 Excerpt: ...will from time to time come in contact with the support, and by the tensions which will thus result the curvatures become "permanent" coils. Geotaxis.--In some lower organisms an influence of gravity on changes of position has been shown to exist. This fact can only be mentioned here. (c) Chemical Stimuli In the same way as light and gravity, heat and electricity, when their action is one-sided, may bring about directive movements of the plant. Since, however, these movements play no great part in nature they need not be further considered. Those directive movements which are brought about by the unequal distribution of dissolved or gaseous substances in the neighbourhood of the plant are of much greater importance; these movements are termed chemotactic and chemotropic. Chkmotropism (102). In the case of Fungi and of pollen-tubes chemotropic movements have been demonstrated which bring the organism into a certain concentration of particular substances; this concentration is the optimal one. With the same organism and the same stimulating substance these movements are sometimes positive and sometimes negative; positive when they lead towards a higher concentration of the substance, and negative in the converse case. In the case of pollen-tubes sugar is the chief substance that acts as a stimulus; in fungi, in addition to sugar, peptone, asparagin, compounds of ammonia and phosphates. There are also substances such as free acids which always have a repellent influence even in extremely weak concentration. Chemotropic irritability has also been demonstrated in roots, though it cannot be said that it plays an important role in their life. In the examples of chemotropism given above the stimulating substances were solid substances in solution. When on...
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Add this copy of A Text-Book of Botany to cart. $4.00, good condition, Sold by HPB-Red rated 5.0 out of 5 stars, ships from Dallas, TX, UNITED STATES, published 2010 by Nabu Press.
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Add this copy of A text-book of botany to cart. $5.00, poor condition, Sold by Accounting text rated 4.0 out of 5 stars, ships from Edgewood, KY, UNITED STATES, published 1898 by Macmillan and co..
Add this copy of A Text-Book of Botany to cart. $17.12, new condition, Sold by Redux Books rated 5.0 out of 5 stars, ships from Wyoming, MI, UNITED STATES, published 2019 by Alpha Editions.
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New. An Unused, unmarked and unblemished copy. THIS BOOK IS A REPRODUCTION OF AN ORIGINAL WORK (the 1898 printing) WHICH IS IN THE PUBLIC DOMAIN IN THE UNITED STATES OF AMERICA, AND POSSIBLY OTHER COUNTRIES. MOST OF THESE WORKS WERE SCANNED FROM LIBRARY COPIES. IT MAY HAVE OCCASIONAL IMPERFECTIONS SUCH AS MISSING OR BLURRED PAGES, POOR PICTURES, ERRANT MARKS, ETC. THAT WERE EITHER PART OF THE ORIGINAL ARTIFACT, OR WERE INTRODUCED BY THE SCANNING PROCESS (this particular book appears to be quite a good reproduction).; 100% Satisfaction Guaranteed! Ships same or next business day!
Add this copy of A Text-Book of Botany to cart. $20.01, poor condition, Sold by Anybook rated 4.0 out of 5 stars, ships from Lincoln, UNITED KINGDOM, published 1912 by Macmillan.
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This is an ex-library book and may have the usual library/used-book markings inside. This book has clothback covers. In poor condition, suitable as a reading copy. Please note the Image in this listing is a stock photo and may not match the covers of the actual item, 1600grams, ISBN:
Add this copy of A text-book of botany to cart. $21.31, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2019 by Alpha Edition.
Add this copy of Text-Book of Botany to cart. $22.01, poor condition, Sold by Anybook rated 4.0 out of 5 stars, ships from Lincoln, UNITED KINGDOM, published 1912 by Macmillan.
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This is an ex-library book and may have the usual library/used-book markings inside. This book has hardback covers. In poor condition, suitable as a reading copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item, 1700grams, ISBN:
Add this copy of A Text-Book of Botany to cart. $25.93, fair condition, Sold by Anybook rated 4.0 out of 5 stars, ships from Lincoln, UNITED KINGDOM, published 1903 by Macmillan.
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This is an ex-library book and may have the usual library/used-book markings inside. This book has hardback covers. In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item, 1700grams, ISBN:
Add this copy of A Text-Book of Botany to cart. $26.58, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
Add this copy of A Text-Book of Botany (Paperback Or Softback) to cart. $33.50, new condition, Sold by BargainBookStores rated 3.0 out of 5 stars, ships from Grand Rapids, MI, UNITED STATES, published 2022 by Legare Street Press.
