1920] 



ROSE, KRAYBILL, &• ROSE— OXIDASE ACTIVITY 



225 



TABLE IV 



Effect of 0.10N potassium tartrate, sodium oxalate, and Ca(N0 3 ) 2 on 



OXIDATION OF PYROGALLOL BY POWDERED HEALTHY APPLE BARK; 



TEMPERATURE 29 . 2-30 . 2° C. 



Time of reading 



June 22 



1-30 



i-45 

 2.00 



■* • Ij • . . • • 



2.30 



2-45 

 3 00 



315 

 3-3o 



3-45 

 4.00 



415 

 t 4-3o 

 June 23 



8.20 



NO BARK 



Potassium 

 tartrate 



O 

 O 



OO 

 II 



O.25 



0.3S 



O.48 



O.68 



O.78 



0.9S 



Sodium 

 oxalate 



0.00 

 0.08 



0.10 



0.19 



0.31 



0.38 



°-35 

 0.68 



Ca(N0 3 ) 



0.00 

 0.18 



o. 20 



0.20 



0.28 



o-35 



0.38 



0.23 





Check 



O.OO 

 O.IO 

 O.25 

 O.30 

 O.38 



0.43 



0-55 

 0.58 



O.70 



0.73 

 O.80 



O.90 



O.90 



I.20 



Bark 





Potassium 

 tartrate 



O.OO 

 O.14 

 O.28 

 0.36 

 O.48 

 O.58 

 O.64 

 0.76 

 0.98 



0.95 

 I.03 



I- 13 

 I 15 



i-53 



Sodium 

 oxalate 



O.OO 

 O.20 

 O.25 



0.35 

 O.46 



0.55 

 O.64 



O.78 



O.80 



O.96 



I. OO 



I. IO 



1.13 



I.60 



Ca(N0 3 )a 



O.OO 

 0.08 

 O.20 

 O.23 

 O.30 



0-3S 

 O.40 



O.50 



°-55 



o-59 

 0.60 



o-73 

 0.70 



0.98 



2 



Fig. 4.— Effect of potassium tartrate on oxidation of pyrogallol with and without 

 bark (healthy): A, control (bark and pyro^illol); B, potassium tartrate+bark and 

 Pyrogallol; C, potassium tartrate+pyrogallol. 



