EXPERIMENTAL DATA OF DETERMINATIONS. 



61 



TABLE 38. Intramolecular respiration after wounding, May 6, 1912. 



The experiment was carried on in New York with material sent from Tucson, consisting 

 of 15 joints of Opuntia versicolor, having a fresh weight of 320 grams. The normal respira- 

 tion as determined the day before the experiment was 0.28 grams per hour. The specimens 

 were wounded at 10 a. m. May 5 by slicing into sections 10 to 15 mm. thick. Wound 

 respiration was observed in air and in pure nitrogen at 20 and 35 C. The wound respira- 

 tion would be somewhere near its maximum when the determinations began. 



TABLE 39. Respiration ivith continuously changing temperature. 



This determination was made at New York, January 29 and 30, 1912, in the dark, under 

 temperature conditions simulating those of a normal spring day at Tucson. The material 

 was sent from Tucson and consisted of 11 mature joints of Opuntia versicolor, having a fresh 

 weight of 130 grams. 



