222 



BOTANICAL GAZETTE 



[march 



Results 



The results of the experiments are shown in tables I-VII and 

 figs. 1-5. 



TABLE I 



Effect of o.i N KC1, NaCl, and LiCl on oxidation of pyrogallol by powdered 



HEALTHY APPLE BARK; TEMPERATURE 23 . 2-23 . 6° C* 



Time of reading 



May 21 



12.30 



12.45 

 1 .00 



115 

 1.30 



1.45 

 2.00 



2. IS 



2.30 



2-45 

 3.00 



3-15 



3-30 



May 22 



8.40 



NO BARK 



O.OO 

 O.O3 

 O.O3 

 0.08 

 O.O5 

 O.OS 

 0.07 

 0.08 

 O.08 

 0.07 

 0.05 

 O.O9 

 O. IO 



O.OO 



O.OO 



O.I3 

 O.I3 



o. 20 

 o. 17 



0.13 

 0.18 



0.19 

 0.19 

 0.17 

 0.16 



o. 19 



o. 20 



Bark 



Check 



O.OO 



O.OO 

 O.OO 

 O.00 

 0.00 

 O.02 

 O.OO 

 0.00 

 005 

 0.04 

 O.05 

 O.05 

 0.06 



0.05 



0.00 



0.00 

 0.03 

 0.08 

 0.23 

 0.25 



o.33 

 0.38 



0.43 



0.45 



045 

 0.50 



0.65 



0.68 





0.00 

 0.06 

 0.05 



0.15 



0.15 



0.15 



0.15 

 0.19 



0. 19 



0.2s 

 0.23 



0. 26 



0.28 



NaCl 



1-25 



0.80 



0.00 

 0.07 



O.II 



0.18 

 0.18 



O. 21 

 O.24 

 O.27 



0.3I 

 O.3O 



O.32 

 O.36 



0-35 



O.74 



LiCl 



0.00 

 0.03 

 0.05 



O.I5 

 O.I5 

 O.I5 



0. 16 

 0.21 

 0.25 

 0.25 

 0.26 

 0.29 

 0.32 



o.77 



only water. 



- I • 



* In tables I-V manometer readings in cm. of mercury corrected against an apparatus containing 

 Aater. 



t3 



£0 





Fig. 1 —Effect of KC1, NaCl, and LiCl on oxidation of pyrogallol by powdered 

 healthy apple bark: A, control (bark and pyrogallol); B, KCl+bark and pyrogallol; 

 C, XaCl+bark and pyrogallol; D, LiCl+bark and pyrogallol. 



