166 



Scientific Proceedings, Royal Dublin Society. 



Tabi,e Y. 



Apogon Grotij). 



Biscussion ofBesiilts of Table V. 

 lu contrast to the preceding one this rather heterogeneous group invariably 

 gives a well-marked benzidine reaction in the veins, and, on the whole, the 

 epidermal reaction is more or less definite. With a-naphthol there is less 

 uniformity. Considering first the two varieties of /. sibirica and the related 

 /. orientalis, it is seen that the limiting factor in the blue-veined /. sibirica 

 is the chromogen, for the benzidine reaction is given by veins and epidermis. 

 The deep pigmentation of the veins, however, seems to inhibit the a-naphthol 



' It certainly is not/, tenuifolin, Pall., as seen by comparison with an herbarium specimen named 

 by Karelin aud Kiriloff. 



