Plants : a Text-Book of Botany
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In our eReader you can find the full English version of the book. Read Plants : a Text-Book of Botany Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Plants : a Text-Book of Botany
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Certain experiments upon plant colors have indicated that the presence of the red color slightly increases the temperature by absorbing more heat. This has suggested that the red color may be a slight protec- tion to the living substance, which has ceased working and which is in danger of exposure to cold. If this be true, it may be that the same explanation will cover the case of the red flush so conspicuous in buds and young leaves in the early spring. It must not be supposed that the need of... protection has developed the color, but that since it is developed it may be of some such service to the plant. The whole subject, however, is too indefinite and obscure to be presented in any other form than as a bare suggestion.
Even the conditions which determine autumnal colora- tion have not been made out certainly. To many the au- tumnal coloration is associated with the coming of frost, which simply means a reduction of temperature ; others associate it with diminishing water supply ; still others associate it with the change in the direction of the rays of light, which are more oblique in autumn than during the active growing season.
What to read after Plants : a Text-Book of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Carl A. Schenck Collection (North Carolina State University). Ncrs to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Certain experiments upon plant colors have indicated that the presence of the red color slightly increases the temperature by absorbing more heat. This has suggested that the red color may be a slight protec- tion to the living substance, which has ceased working and which is in danger of exposure to cold. If this be true, it may be that the same explanation will cover the case of the red flush so conspicuous in buds and young leaves in the early spring. It must not be supposed that the need of... protection has developed the color, but that since it is developed it may be of some such service to the plant. The whole subject, however, is too indefinite and obscure to be presented in any other form than as a bare suggestion.
Even the conditions which determine autumnal colora- tion have not been made out certainly. To many the au- tumnal coloration is associated with the coming of frost, which simply means a reduction of temperature ; others associate it with diminishing water supply ; still others associate it with the change in the direction of the rays of light, which are more oblique in autumn than during the active growing season.
What to read after Plants : a Text-Book of Botany?
You can find similar books in the "Read Also" column, or choose other free books by Carl A. Schenck Collection (North Carolina State University). Ncrs to read onlineMoreLess
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