. Experimental plant physiology for beginners. Plant physiology. THE FOOD OF THE PLANT 43 The relation that exists between a plant and the surrounding air can now be dealt with. Answers to the following questions will be sought. Does a plant get any food from the air ? If it does, what is the nature of the food taken, and under what conditions is it obtained ? II. THE ABSORPTION OF POOD FBOM THE AIR Experiments dealing with the absorption of food from the air are more difficult than those connected with absorption from the soil, because invisible gases are here bemg dealt with. A few prelimina
. Experimental plant physiology for beginners. Plant physiology. THE FOOD OF THE PLANT 43 The relation that exists between a plant and the surrounding air can now be dealt with. Answers to the following questions will be sought. Does a plant get any food from the air ? If it does, what is the nature of the food taken, and under what conditions is it obtained ? II. THE ABSORPTION OF POOD FBOM THE AIR Experiments dealing with the absorption of food from the air are more difficult than those connected with absorption from the soil, because invisible gases are here bemg dealt with. A few preliminary experiments will be made. Experiment 24 Aim.—To find out whether 0,ir can pass from the atmosphere into and through a leaf. Method.—A piece of straight glass-tubing drawn out to a point at the lower end and a piece of glass-tubing bent at right angles are put through a two-holed cork. The cork is then fitted into a conical flask or a bottle partly filled with water. In the upper end of the straight tube a stout leaf is fixed; a laurel leaf is a suitable one for the purpose. A piece of rubber-tubing with a clip is attached to the end of the right- angled tube. The junction between the leaf and the tube and all the joints in connec- tion with the cork are then made air- tight (Fig. 20). If a big succulent leaf such as a funkia can be obtained the apparatus may be set up more simply. In this case the straight glass-tube can. Fig. 20. 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 Cox, Lucy Ellen. London, New York [etc. ] Longmans, Green and Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantph, bookyear1915
