Acidity and gas interchange in cacti by Herbert M. Richards

By Herbert M. Richards

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It is possible that there may be a correlation between degree of acidity and transpirationrate, and certainly the amount of water held at any one time in the tissues would affect the acidity of the pure juice, even if it did not greatly influence the To establish points of this nature would require further total amount of acid. investigations with a large number of experiments designed to bring out such In this work no especial effort was made to go further into the relationships. matter than has been indicated.

Acidity in diminished and increased oxygen supply of old and young joints of Opuntia Acidity is shown Experiments kept Begun. versicolor. in terms of cubic centimeters of in darkness. N /10 KOH per cubic centimeter juice. Tucson, Arizona, July 1912. EXPERIMENTAL DATA ON ACIDITY DETERMINATION. TABLE 21. Effect of injury on acidity. Opuntia 45 versicolor. Shows the effect of injury on acidity in mature joints, turgid from winter rains and injured by slicing into sections 5 to 10 mm. thick, at Tucson, Arizona, March 1911.

To utilize quartz or special glass for the receiver and cool it by some device which did not require the immersion in water. With such an apparatus one might indeed obtain an even greater evolution of carbon dioxide. The figures ice ized that are under rather than over the possible ones. FIG. 5. rate of evolution of carbon dioxide by Opuntia versicolor at different In milligrams of COj per gram hour. The data are from table 31. Graph showing temperatures. WOUND RESPIRATION. That the small injury resulting from the removal of joints from the cactus plants does not produce any measurable wound respiration has already been shown in the description of experimental methods and precautions, and further is unnecessary; but that a definite wound respiration follows a considerable injury was established (tables 36, 37) and is of some interest, The sudden temporary rise especially in connection with the acidity relations.

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