Botanica elementare . durante la respirazione. L'energia si manifesta anche con la crescita. 232. Bespiration nel verde in una pianta.-Ci può prendere una pianta in vaso whichhas un ben sviluppato di superficie di foglia e collocarlo sotto un raccordo a tenuta la campana. Sotto la campana di vetro ci dovrebbe anche essere placeda piccolo recipiente contenente acqua di barite. Un sim-ilar apparecchio dovrebbe essere impostato, ma con noplant, per servire come un controllo. L'esperimento deveessere impostata in una camera che non è frequentato bypersons, o il biossido di carbonio in camera fromrespiration sarà inficiare l'esperimento. La campana contenente la pianta dovrebbe essere coperta conun b

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Elementary botany . during respiration. Energy is also manifested by growth. 232. Bespiration in a leafy plant.—We may take a potted plant whichhas a well-developed leaf surface and place it under a tightly fitting bell jar. Under the bell jar there also should be placeda small vessel containing baryta water. A sim-ilar apparatus should be set up, but with noplant, to serve as a check. The experiment mustbe set up in a room which is not frequented bypersons, or the carbon dioxide in the room fromrespiration will vitiate the experiment. The belljar containing the plant should be covered witha black cloth to prevent carbon assimilation. In Test for Hberatfon of car- the COUrSe °f IO OT I2 h°UrS if everything hasbon dioxide from leafy plant worked properly, the baryta water under the jarwatei? lnSplsma<ller vesseL with the plant will show the film of barium ca*--(Sachs.) bonate, while the other one will show none. Res- piration, therefore, takes place in a leafy plant as well as in germinating see4». RESPtRA Tioisr. US 233. Respiration in fungi.—If several large actively growing mushroomsare accessible, place them in a tall glass jar as described for determiningrespiration in germinating peas. In the course of 12 hours test with thelighted taper and the baryta water. Respiration takes place in fungi aswell as in green plants. 234. Respiration in plants in general.—Respiration is general in allplants, though not universal. There are some exceptions in the lowerplants, notably in certain of the bacteria, which can only grow and thrivein the absence of oxygen. 235. Respiration a breaking-down process.—We have seen that in res-piration the plant absorbs oxygen and gives off carbon dioxide. We shouldendeavor to note some of the effects of respiration on the plant. Let ustake, say, two dozen dry peas, weigh them, soak for 12-24 hours in water, and, in the folds of a cloth kept moist by covering with wet paper or sphag-num, germinate them. When well germinated an