1905.] The Alcoholic Ferment of Yeast-Juice. 413 



off whilst in C it diminishes much more slowly. A similar initial period is 

 also observable in A, but is not nearly so marked. 



10 20 30 40 50 60 70 80 90 100 110 120 



Tt ME / N M/ A/ CITES 



The extra quantity of carbon dioxide evolved in this initial period may be 

 calculated by subtracting the amount corresponding with the constant rate 

 which is finally attained from the total amount observed. This is done 

 graphically in fig. 2 by continuing the straight line representing the constant 

 rate back to the axis of ordinates. The following numbers are thus obtained : 

 for A, 16-6 ; for B, 75"4; for C, 192 9. 



The amounts due to the addition of boiled juice are therefore : for 1 volume 

 in B, 75-4- 16-6 = 58-8; for 3 volumes in C, 192-9 -16-6 = 176-3 = 3x58-8. 



The extra amount of carbon dioxide is, therefore, directly proportional to the 

 volume of boiled juice added. 



