128 



BOTANICAL GAZETTE 



[FEBRUARY 



fractions, hence it seemed worth while to collect these separately. 

 This was done for both healthy and diseased tissue and gave 



TABLE XVIII 

 Oxidation of pyrogallol by aqueous solutions of precipitated oxidase 



FROM healthy AND DISEASED BARK, WITH TUSJD WITHOUT 



gelatine; -temperature 29.3-30.3° C. 



Fig. 6. — Oxidation of pyrogallol by precipitated oxidases from healthy and 

 diseased bark, with and without gelatine, shaken only during period from A to B: 

 A, precipitate from healthy bark without gelatine; B, precipitate from healthy bark 

 with gelatine; C, precipitate from diseased bark without gelatine; D, precipitate 

 from diseased bark with gelatine. 



precipitates whose air dry weights, determined by the use of tared 

 filters, were as follows: 



The greater amount of precipitate from diseased bark may or 

 may not be directly connected with its greater oxidase activity. 



