. South African botany. Botany. PLANT PHYSIOLOGY 137 106. Experiment 14.—To see if green leaves absorb carbon di-oxide in the sunlight and give out oxygen. Apparatus.—Two bell-jars vrith corks that tightly fit the holes at the top, two candles, two large dishes of water, beaker, leaves. Method.—Stand a candle in each dish of water and light it. Stand a beaker of water containing some leaves beside the candle in one dish, cover both leaves and candle with the bell-jar, and then cork up the top tightly. Cover the other candle also with a bell-jar and cork it up. Presently both candles will go ou
. South African botany. Botany. PLANT PHYSIOLOGY 137 106. Experiment 14.—To see if green leaves absorb carbon di-oxide in the sunlight and give out oxygen. Apparatus.—Two bell-jars vrith corks that tightly fit the holes at the top, two candles, two large dishes of water, beaker, leaves. Method.—Stand a candle in each dish of water and light it. Stand a beaker of water containing some leaves beside the candle in one dish, cover both leaves and candle with the bell-jar, and then cork up the top tightly. Cover the other candle also with a bell-jar and cork it up. Presently both candles will go out and at the same time water will rise in the bell-jars. This is because the candle in burning uses up the oxygen in the jars, and forms carbon di-oxide ; and the gases left do not support combustion. So now we have two bell-jars, each containing some carbon di-oxide. Place both dishes with their bell-jars in a bright sunny place, and leave for three or four hours. Great care must be taken to see that the jars are absolutely air- tight, and that no air enters them when they are moved. Then quickly take the stopper out of each jar, and insert a lighted taper. Besult.—The taper burns in the jar which had leaves in it, but goes out in the one that had no leaves. Deduction. — The leaves must have absorbed the. ceMstic botsLih Pig. 75.—Apparatus to Show that Carbon Di-oxide is Necessary for Oai'bon As- 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 Storey, Francis W; Wright, K. London, New York, Longmans, Green
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