14 



MISSOURI AGR. EXP. STA. RESEARCH BULLETIN NO. 21 



they were put in the respiration chambers. If the calculations had 

 been made on fresh weight, the results would have been affected 

 relatively little. It should be kept in mind that while the dry twigs 

 had lost nearly one-fourth of their weight, that this was made up 

 again before putting the material in the chamber. The KOH bulbs 

 were weighed every twenty-four hours and from this the results 

 were reduced to a one-hour basis. 



TABLE 1 CO t PRODUCED BY MOIST, BY DRIED AND BY FROZEN KING DAVID 

 APPLE TWIGS AT 15 to 19 C. 



The figures in Table 1 show that the frozen twigs produced 

 more CO 2 during the first day than either the dried or the moist 

 material. After that the dried twigs took the lead. Both the moist 

 and the dry twigs produced more CO 2 the second day than the first, 

 but the frozen twigs produced less. After the second day, the respir- 

 atory activity diminished in all cases. 



TABLE 2 RATIO OF CO 2 PRODUCED BY TREATED TO CO S PRODUCED 

 BY MOIST TWIGS 



Table 2 gives the ratio of the CO 2 produced by the treated to 

 the CO o produced by the moist twigs. The figures are obtained by 

 dividing the amount of CO 2 produced per 100 gr. treated twigs, per 

 hour, by the amount of CO 2 produced by 100 gr. untreated or moist 

 twigs per hour. 



During the first day, the frozen twigs produced more than 

 four times as much CO 2 per hour, per 100 gr. of twigs as the twigs 

 kept moist. The dry twigs gave off three times as much. The ratios 

 fell on the second and third days in both cases; but on the fourth 

 day they rose again. These figures show that the decline in the 

 respiratory activity of the twigs kept moist went on more slowly 

 and more uniformly than either of the treated sets. The figures also 



