224 



BOTANICAL GAZETTE 



[march 



TABLE III 

 Effect of o.ioN KC1 and K 2 C0 3 on oxidation of pyrogallol by powdered 



DISEASED APPLE BARKJ TEMPERATURE 27.8-29.0° C. 



Time of reading 



March 10 

 10.00 

 . 10.15 

 10.30 

 10.45 

 11 .00 



11. 15 

 11.30 



11 45 

 12.00 



12.15 

 12.30 



12-45 

 1. 00 



March n 



9-45 



NO BARK 



K 3 C0 3 



O.OO 

 O.68 

 1.24 

 I .65 

 I.98 

 2. 25 



2.38 

 2.52 



2.65 



2-75 

 2.78 



2.85 

 2.99 



3-53 



KC1 



0.00 

 0.05 

 0.00 

 0.00 

 0.08 

 003 

 0.03 

 0.00 

 0.05 

 0.00 

 005 

 0.08 

 0.05 



Check 



O.IO 



O.OO 



O.I3 

 O.30 



O.50 

 O.65 

 O.72 



O.85 

 O.99 



I .04 



I 15 

 1. 18 



I 25 



I.38 



2.20 



Bark 



KaCO* 



0.00 

 0.46 

 0.90 

 125 



I-50 

 1.72 



i-93 

 2.09 



2. 22 



2.35 



2-39 



2-55 

 2.65 



3-73 



KCI 



0.00 

 0.16 



o.33 

 0.38 



0.48 



0.60 



0.69 

 0.82 



0.88 



o.95 



0-95 

 1. 00 



1. 10 



1.73 



Fig. 3.— Effect of KCI and K 2 C0 3 on oxidation of pyrogallol with and without 

 bark (diseased): A, control (hark and pyrogallol); B, K 2 C0 3 +bark and pyrogallol; 

 C, K 2 C0 3 +pyrogallol; D, KCl+bark and pyrogallol (KCl+pyrogallol gave no 

 oxidation). 



