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 4 6 8 10 



Quantity of yeast in grams * 



FIG. 14. 



of yeast : i 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 



