. Elementary botany. Botany. 56 PHYSIOLOG 130. Respiration is necessary for —After we have performed this experiment, if the vessel has not been open too long so that oxygen has en- tered, we may use the vessel for another experiment, or set up a new one to be used in the course of 12 to 24 hours, after some oxygen has been con- sumed. Place some folded damp filter paper on the germinating peas in the jar. Upon this place one-half dozen peas which have just been germinated, and in which the roots are about 20-25 n^™ long. The vessel should be cov- ered tightly again and set aside i
. Elementary botany. Botany. 56 PHYSIOLOG 130. Respiration is necessary for —After we have performed this experiment, if the vessel has not been open too long so that oxygen has en- tered, we may use the vessel for another experiment, or set up a new one to be used in the course of 12 to 24 hours, after some oxygen has been con- sumed. Place some folded damp filter paper on the germinating peas in the jar. Upon this place one-half dozen peas which have just been germinated, and in which the roots are about 20-25 n^™ long. The vessel should be cov- ered tightly again and set aside in a warm room. A second jar with water in the bottom instead of the germinating peas should be set up as a check. Damp folded filter paper should be sup- ported above the water, and on this should be placed one-half dozen peas with roots of the same length as those in the jar containing carbon dioxide. 131. In 24 hours examine and note how much Fig. 48. growth has taken place. It will be seen that the Pfa seedlings; Hie one . _ at ttie left had no oxygen roots have elongated but very little or none in the and little growth took first jar, while in the second one we see that the S,'oxygen and grow^h"was roots have elongated considerably, if the experi- evident. ment has been carried on carefully. Therefore in an atmosphere devoid of oxygen very ! ittle growth will take place, which shows that normal respiration with access of oxygen is necessary for growth. 132. Energy set free during respiration.—From what we have learned of the exchange of gases during respiration we infer that the plant loses carbon during this process. If the process of respiration is of any benefit to the plant, there must be some gain in some direction to compensate the plant for the loss of carbon which takes place. It can be shown by an experiment that during respiration there is i slight elevation of the temperature in the plant tissues. The plant then gains some heat during respiration. Ener
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