. Elementary plant physiology. Plant physiology. Respiration, Digestion, and Fermentation. chemical combination with either the original substance or any of its derivatives. Fermentation may also serve an im- portant purpose in digestion, in which its chief purpose is to reduce the foods to soluble and diffusible form. 104. Exhalation of carbon dioxide by germinating peas.—Fill a glass cylinder, of a capacity of about a liter, one-third full of peas which have lain in water at a proper temperature for a day. Cover tightly with a glass plate or wooden top sealed with vase- line. Twelve or fourt
. Elementary plant physiology. Plant physiology. Respiration, Digestion, and Fermentation. chemical combination with either the original substance or any of its derivatives. Fermentation may also serve an im- portant purpose in digestion, in which its chief purpose is to reduce the foods to soluble and diffusible form. 104. Exhalation of carbon dioxide by germinating peas.—Fill a glass cylinder, of a capacity of about a liter, one-third full of peas which have lain in water at a proper temperature for a day. Cover tightly with a glass plate or wooden top sealed with vase- line. Twelve or fourteen hours later provide a section of can- dle 2 or 3 centimeters long with a holder of bent wire. Carefully slide the cover to one side without creating currents of air, and lower the burning candle into the jar. Note result. Repeat two or three times. Make the test also with a jar containing the same quantity of dry peas. Make a fresh solution of lime or baryta water. Pour some into clean dishes. Set one inside the cylinder containing the grow- ing seeds, and another in one carefully as before. Examine a. ^'^%- 75-—Method of testing g^as liberated by germinating peas. After Saclis. with dry seeds. Cover few hours later. The lib- eration of carbon dioxide will be denoted by the formation of a film of carbonate of calcium or barium in the liquid. The series of tests given above may be repeated with a quan- tity of flowers of clover or sunflower. 105. Estimation of the amount of carbon dioxide. 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 MacDougal, Daniel Trembly, 1865-1958. New York, London [etc. ] Longmans, Green, and Co.
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