F. G. GUSTAFSON 



37 



hydrogen peroxide was then added, and 4 minutes were allowed to 

 elapse. The time required to produce a definite^ amount of CO2 

 was then measured. The time it took to produce the same amount 

 of CO2 in the alkaline solution was then compared with the time in 

 the neutral solution.^ In Fig. 1, the comparison is expressed by taking 



Rate o[ CO^ pro auction 

 4,0007c 



30 60Nin. 



Fig. 1. Curves showing the rate of production of CO2 by a solution of 

 dextrose and hydrogen peroxide. Curve A shows the rate in a solution having 

 a pH of 8.75, B in a solution of pH 7, C in a solution of pH 5, D in a solution 

 of pH 1. The rate in the absence of hydrogen peroxide is taken as 100 percent. 



^This was ascertained by titrating with CO2 as described in a former paper. 

 (Gustafson, F. G., /. Gen. Physiol, 1919-20, ii, 617.) 



^ The experiments with alkaline and neutral solutions were carried out almost 

 simultaneously. 



