Atkins — Oxydases and their Inhibitors in Plant Tissues. 165 



Table IV. 



Fogimh-k Group. 



Discussion of Results of Table IV. 



Ill this group the benzidine reaction is rather of a brown-yellow colour 

 than of the usual dark brown. It will be noted that the a-naphthol reaction 

 is invariably absent from the epidermis, and present only in traces in the 

 veins, with one exception. The benzidine reaction is only really well 

 developed in I. germanica. The garden " Victorine," which is given as a variety 

 of /. hybrida, of doubtful origin, evidently owes its white mottlings to an 

 inhibitor ; this diffuses and checks the oxydase reaction. In this specimen 

 the colour is only partly restored for the same reason. The pale hues of 

 /. imllida forms are probably due to the presence of inhibitors ; but no 

 material was available to test this point by the cyanide method. 



Table V records the behaviour of the Apogon group. 



SCIENT. PROC, R.D.S., VOL. XIV., NO. VIII. 



2b 



