EFFECTS ON ALCOHOLIC FERMENTATION 2O9 



This result suggests that either the products of fermentation varied 

 in the three cases, or else the yeast mixture was modified differently 

 by the two radioactive preparations. Possibly the differential result 

 is due to a combination of both conditions. Its real meaning must 

 await further experimentation. 



In a repetition of Experiment 85 the following readings were 

 recorded of the volumes of gas given off in fermentation : 



Radio- 

 tellurium Control Temp. ° C. 

 0.00 c.c. 0.00 c.c. 



.So .60 



1.80 1.35 



2.85 2.40 



4-30 3-45 



5.00 4.15 



5.60* 4.85 



Experiment 86 

 In the following experiment, into each of five saccharimeters, 

 filled with 10 c.c. of a 10 per cent, solution of cane sugar, was 

 placed .20 gm. of a Fleischmann's compressed yeast cake. Radium 

 preparations were inserted into the saccharimeters as indicated in the 

 following table, and the following readings of the saccharimeter 

 scale were recorded : 



Bubbles began to rise in the 1,500,000 and 10,000 preparations 

 within two minutes after the preparations were placed in the thermostat 

 oven, but no bubbles were rising in the control tubes up to four min- 

 utes after. The exact time in the latter was not observed, but vig- 

 orous fermentation did not begin in the control tubes as soon as in 

 the other two tubes just mentioned. 



* Estimated. The surface of the yeast mixture has passed off the scale, 

 t At II : 25 A. M. the thermometer registered 35°. 



