. Botanique de la plante vivante. La botanique. La nutrition, l'entreposage, ET LA RESPIRATION lol directe du soleil qu'en diffus Hght : que rouge, orange et jaune rayons du spectre sont plus efficaces que celles de la bleue ou violette ; et que le processus lui-même dépend de la présence de dioxyde de carbone dissous dans l'eau. Par conséquent, si l'eau est utilisée à partir de laquelle le dioxyde de carbone a été chassés par l'ébullition, les bulles d'oxygène ne sera pas libérée.. Fig. 73- Arrangement pour montrant l'oxygène dégagé dans Photo-Synthesis. Un xpusure, avant d'e.à la lumière, le tube est rempli d'eau. B, après l'exposition pour

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. Botany of the living plant. Botany. NUTRITION, STORAGE, AND RESPIRATION lol direct sunlight than in diffused Hght: that red, orange, and yellow rays of the spectrum are more effective than those of the blue or violet; and that the process itself depends upon the presence of carbon dioxide dissolved in the water. Thus, if water be used from which the carbon dioxide has been driven off by boiling, the bubbles of oxygen will not be discharged.. Fig. 73- Arrangement for showing oxygen given off in Photo-Synthesis. A, before e.xpusure to light, the tube is filled with water. B, after exposure for sonic time. A large volume of discharged gas has collected in the tube. The relation of the activity of Photo-Synthesis to temperature has been illustrated by observations on the leaves of Hottoma, as reckoned in the number of gas-bubbles given off in five minutes, during which peiiod the temperature remained constant. At 14° G. the number was about 200. When the temperature was raised to 31=^ C. the optimuni number of about 550 was reached, while at 56.5° C. the activity ceased. The effect of light in Photo-Synthesis is strictly local, that is, it is limited to those points where the rays actually fall. This is shown by experiments with stencil plates. Letters or other figures arc cut out of an opaque card or tinfoil; or a plain strip will serve. It is applied closely to the surface of a green leaf of a living plant, which has pre- viously been kept in the dark for two days, so that the starch will have been completely removed from the cells (see p. 111). The leaf should then be exposed to sunlight for six hours or so. If it then be removed, boiled for a minute in water, decolourised with alcohol, and stained with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Bower, F. O. (Frederick Orpen), 1855-1948.

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