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



TABLE' 5 CO 2 PRODUCED^BY ETHERIZED'IAND BY UNTREATED JONATHAN 

 APPLE TWIGS AT VARIOUS TIMES DURING THE DORMANT SEASON. 

 TEMPERATURE 15-18C. 



*Average for 4th and 5th days. 



The data are shown graphically in the form of curves in Fig. 6. 

 The mg. of CC>2 produced by 100 gr. twigs per hour, are laid off on 

 the vertical and the days of the experiment on the horizontal. The 

 points are located half way between the beginning and the end of 

 the days, and not at the end of the day when the bulbs were weighed. 

 This was done because the points are averages of twenty-four hours 

 being reduced to a one-hour basis from weighings made once a day. 

 The Roman numerals indicate the number of the experiments. The 

 dates on which these experiments were started are indicated in the 

 right-hand corner of the figure. The curves labeled "a" show the 

 CO 2 production of etherized twigs; those labeled "&", of the un- 

 treated material, la and Ib show the curves of CO 2 production of 

 etherized and of untreated twigs respectively during Experiment I 

 which was started on October 23, 1913. Similarly Ila and lib, Ilia 

 and III& are parallel pairs. 



A study of Fig. 5 shows that in all cases the etherized material 

 gave off more CO 2 during the first few days than the untreated 

 whose CO2 production was determined at the same time, i.e., la 

 gave off more than I&; I la more than 116, etc. 



A more detailed examination show that the individual etheriza- 

 tion curves differ markedly both in their location with respect to 

 the curves of the untreated twigs as well as in the amount of curva- 

 ture. In Experiment I, a is but very little above &, and both curves 

 run nearly parallel to each other. In II, a is considerably above b. 



