389 



PAPERS READ. 



THE EXAMINATION OF KINOS AS AN AID IN THE 

 DIAGNOSIS OF EUCALYPTS. 



PART III.— THE TURBID GROUP. 



By J. H. Maiden, F.L.S., F.C.S. 



My third large group of kinos I call the turbid group, — 

 certainly a descriptive name, as the members of it all form turbid 

 solutions in water, owing to the presence of catechin. This 

 sharply defines them from the other two groups. Another 

 characteristic is their extreme friability. 



This group contains a more heterogeneous collection of sub- 

 stances than do the other two, but beyond submitting a few 

 suggestions as to the affinities of certain kinos comprehended in 

 it, I do not propose to form additional groups at present, until 

 the number of authentic specimens worked at by other observers 

 or myself is very largely increased. 



It follows, from the friable nature of kinos of this group, and 

 the way in which they fall to pieces as soon as they get dry, that 

 "Turbid Kinos" are always in small fragments, while the ruby 

 and gummy ones are frequently in agglutinated masses of a con- 

 siderable size, which require some force to break up. As a 

 consequence of the foregoing the percentages of moisture are 

 comparatively low. 



Description of a typical Kino of the Turbid group. 



Colour reddish-brown, with the following exceptions : E. 

 maculata, E. microcorys. Most of them, perhaps all, possess an 

 odour, at least when perfectly fresh. Bright looking when perfectly 



