Atkins — Oxidases and their Inliibitors in Plant Tissues. 319 



Tablk II. 



Apogon Group. 



Discussion of Results of I'able II. 



It is frequently hard to decide whether a slight colour in the epidermis is 

 really due to oxidase action, such as represented by a single plus sign, or 

 whetlier it is due to staining, as the benzidine solution is never quite colour- 

 less. With a-naphthol this difficulty is not so great. 



On the whole, the members of this group of widely divergent forms show 

 well-marked reactions. Of special interest is the behaviour of Nos. 17-21. 



3e 2 



