REACTION OF CELLS 



61 



Rubner has carried out a much more elaborate 

 series of experiments at 30° C. He took the heat 

 evolved, determined calorimetrically, as a measure 

 of the quantity of sugar decomposed. He used 

 in four different experiments the following quantities 



2 



O 



25 



I 20 



1= 



I 15 



E 

 2 

 o 



TO 



o 



■&• 



c 



3 



o 



■o 

 2 

 a. 



20 



15 



10 



> 

 © 

 > 



V 



a> 



/O 



fe^ 



Dead yea si 1000 cal 



-v-l200cal 



**** 



in 2 hours 



-1000 cal 



-800 cal 



10 



CO 



too 



-4>500t)al 



250c€ 



6 8 10 



Quantity of yeast in grams — > 



Fig. 14. 



of yeast : 1 gramme, 2 grammes, 4 grammes and 

 8 grammes for a given quantity of cane sugar (50 

 grammes in 250 cc. solution), and found, as indi- 

 cated by the figures below and the accompanying 

 diagram (Fig. 14), that for a certain degree of de- 

 composition, corresponding to an evolution of 800 or 

 1000 or 1 200 gramme-calories, the productof quantity 



