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The Principles of Descriptive and Physiological Botany

The Principles of Descriptive and Physiological Botany


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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. 1835 Excerpt: ...analogous to a nervous system, rest upon the effects produced on them by different poisons. When corrosive poisons are imbibed into their system, they destroy the tissue much in the same way as in the animal frame; but when narcotic poisons are imbibed, although they kill the plants, they do not appear to hare produced any derangement or disorganisation in their tissue. But it has been argued that, as these latter poisons act upon the nervous system of animals, we may suspect something analogous to this system to exist in vegetables also. A long list has been given of substances which act as poisons on plants; and it has been ascertained that very nearly all such as are deleterious to animal are so likewise to vegetable life, and many others besides, which animals may take with impunity. Some of those which it is necessary to administer in large quantities in order to produce death in animals, are sufficiently powerful to kill plants when given in very small doses--as alcohol, ethers, and oils; whilst on the other hand, the oxides of lead and zinc, which poison animals when administered in small portions, produce little or no effect on plants, probably because they are incapable of being absorbed by the spongioles. Most vegetable extracts and excretions act as poisons on all plants (even upon those from which they were obtained) when they are imbibed by the roots. Gases diffused in water are harmless. Many salts are highly noxious, but most of the salts of lime produce no effect. Fortunately for the permanence of vegetation on the surface of the earth, the natural poisons are not very generally diffused in places where plants are likely to grow. (151.) Periodicity.--In tracing the various analogies which exist between the phenomena of animal and vegetable l...


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Product Details
  • ISBN-13: 9781231506615
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 90
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 123150661X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 177 gr


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