312 



B01 INIC I / G IZETT1 



[01 roBi i 



an increased amount of C( ).. in the tissues, without a corresponding 

 decrease in oxygen. 



Table II gives the data obtained for potatoes. The potatoes 

 used were purchased on the open market, and the variety was nol 

 determined. They were sound, smooth, and of uniform average 

 size. A few carrots were also studied, for comparison with the 

 apples and potatoes. From the data presented it is apparent 

 that the same general tendency holds in potatoes and carrots 

 that was noted in apples, that is, an increasing percentage of C0 2 

 and a decreasing oxygen content at higher temperatures. 



TABLE II 



Analyses of gas in intercellular si- mis of potatoes and carrots 



It will be noted that the total CO, and oxygen is much higher 

 in the case of potatoes than was found in apples. This variation 

 may be due in part to the fact that there is relatively much less 

 intercellular space in potatoes than in apples, and a higher per- 

 centage of the gas may have come out of solution in the juice in 

 the samples obtained from potatoes than in those obtained from 

 apples. It is necessary to use much larger samples of potato 

 tissue in order to obtain sufficient gas for an analysis than is 

 essential when apple tissue is used. 



The amount of gas that may be coming out of solution in the 

 juice, rather than from the intercellular spaces, presents a difficult)- 

 inherent in this method of sampling. There is no assurance that 

 the gas that comes out of solution is of exactly the same composition 

 as that of the intercellular spaces. The consistent results recorded 



