225 



BOTANICAL GAZETTE 



[march 



TABLE IV 

 Effect of o.ioN Potassium tartrate, sodium oxalate, and Ca(N0 3 ) 2 on 



OXIDATION OF PYROGALLOL BY POWDERED HEALTHY APPLE BARK; 

 TEMPEK VI ORE 29. 2-30 . 2° C. 



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

 bark (healthy): A, control (bark and pyrogallol); B, potassium tartrate+bark and 

 pyrogallol; C, potassium tartrate+pyrogallol. 



