24 



STUDIES OX FRUIT RESPIRATION. 



It is also possible to calculate the range of temperature through 

 which it will be necessary to warm the fruit before the activity is 

 doubled or changed by any other factor. If the activity is doubled — 



y"=y'10 a <*"-*') 

 and ?/_' ' 



y' 



log 2 



lQa{t" _ *') = 2. 



t: 



In Table 2 are given the constants derived by inspection from the 

 straight lines drawn among the points determined by plotting the 

 logarithms of the carbon dioxid formed per kilogram per hour. 

 Logarithm y is the constant for any special fruit, and the number 

 corresponding (y ) is the calculated respiratory activity at 0° C. 

 expressed as milligrams of carbon dioxid per kilogram per hour. The 

 constant a is a more general constant, changing slightly from one series 

 of determinations to another, and is the rate at which the logarithm 

 of the respiratory activity changes per degree of rise in temperature. 

 It corresponds to the constant ii of unimolecular chemical reactions in 

 which the independent variable is time. The number of times by 

 which the respiratory activity increases for 10° C. is also given, as 

 well as the temperature intervals through which the fruits must be 

 warmed in order that the activity be doubled. 



Table 2. — Constants determined by inspection from figs. 10-14, the increment for 10° 0.. 

 and the temperature increase required to double the activity. 



Kind and variety of fruit. 



Log y - 



Incre- 

 ment for 

 10° C 



Temper- 

 ature 

 increase 

 required 

 to double 

 the ac- 

 tivity. 



Strawberries: 



Martin's New Queen. 



Gandy 



Black raspberries: 



Kansas 



Do 



Red raspberries: 



Cuthbert 



Blackberries: 



Eldorado 



Do 



Wild 



Red currants: 



Fay 



Do 



Black currants 



Do 



Huckleberries: 



Gaylusaccia baccata. 

 Peaches: 



Carman (hard-green) . 



Carman (ripened) 



Do 



Hiley 



Champion 



Connett 



Do 



Elberta 



Plums: 



Wragg 



Gofl 



"Damson" 



1.240 

 1.250 



1.357 

 1.390 



1.310 



17.4 



17.8 



22.8 

 24.6 



20.4 



1.550 



35.5 



1.420 



2a 3 



1.320 



20.9 



.710 



5.1 



.690 



4.9 



1.060 



12.0 



1.080 



11.5 



1.055 



11.4 



.818 



6.6 



1.070 



11.8 



1.000 



10.0 



.895 



7.9 



.800 



6.3 



1.010 



10.2 



.930 



8.5 



.920 



8.3 



.810 



6.5 



.655 



4.5 



.610 



4.1 



0. 0366 

 .0365 



.0408 



.0:357 



.03S4 



.0277 

 .0320 

 .0390 



.0344 



,0347 

 .0341 



0302 



.0461 

 , 0374 

 .0377 

 .0402 

 .0440 

 .0357 

 .0359 

 ,0357 



.0438 



2.32 

 2.32 



2.56 

 2.28 



2.42 



1.89 

 2.09 

 2.45 



2.21 

 2.17 



2.22 

 2.19 



2.00 



2.88 

 2.37 

 2.38 

 2.52 

 2.75 

 2.28 

 2.29 

 2.28 



2.40 

 2.74 

 2.49 



8.2 



7.4 

 S.4 



7.8 

 10.9 



8.8 

 9.0 



10.0 



8.1 



s.o 



7.5 

 6.8 

 8.4 

 S.4 

 8.4 



