. An introduction to vegetable physiology. Plant physiology. 94 VEGETABLE PHYSIOLOGY A more elaborate method of demonstrating transpiration consists in placing the end of a cut branch in a small glass vessel, preferably a U-tube, filled with water, as shown in fig. 63. The branch passes through the cork of the vessel in such a way as to prevent any escape or evaporation of water at that point. Communicating with the other arm of the U-tube is a side tube, bent at right angles, which dips into the water through a perforated cork. This tube is also filled with water. As transpiration proceeds th
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. An introduction to vegetable physiology. Plant physiology. 94 VEGETABLE PHYSIOLOGY A more elaborate method of demonstrating transpiration consists in placing the end of a cut branch in a small glass vessel, preferably a U-tube, filled with water, as shown in fig. 63. The branch passes through the cork of the vessel in such a way as to prevent any escape or evaporation of water at that point. Communicating with the other arm of the U-tube is a side tube, bent at right angles, which dips into the water through a perforated cork. This tube is also filled with water. As transpiration proceeds the water. Fig. 63.—Apparatus to dbmosstrate Tkanspieatioii of a Bban-ch. is gradually drawn from the horizontal tube, and its pro- gress can be noted by arranging a scale behind it. The stem or branch should be kept with its cut end immersed in water for several hours before being placed in the apparatus, as its vessels contain air at a negative pressure when it is cut, owing to the transpiration which has been taking place from it before its separation from the plant. The existence of this negative pressure will lead to an imme- diate absorption of water, which might be mistaken for an active transpiration. The evaporation takes place to a certain extent through. 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.. Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill