THE EXAMINATION OF KINOS AS AN AID 

 IN THE DIAGNOSIS OF EUCALYPTS. 



PART I.— THE RUBY GROUP. 



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



The astringent exudations so common on species of Eucalyptus 

 are termed Kinos. The author is not aware that these substances 

 have hitherto been taken cognisance of in the elucidation of species, 

 and he proposes to give a brief account of his experiments in this 

 direction. The genus Eucalyptus is such an abnormally difficult 

 one, that any method of showing the affinities of its species must 

 be welcome. 



The author has already shown (Pharm. Journ. [3], XX. p. 221) 

 that Eucalyptus Kinos may readily be grouped into three great 

 classes, according to their behaviour with water and with spirit. 

 Briefly, he divided them into (1) The Buby Group, which consists 

 of ruby-coloured Kinos, the members of which are soluble either 

 in cold water or in cold spirit ; (2) The Gummy Group, whose 

 members are soluble in cold water, but very imperfectly in spirit, 

 owing to the gum they contain ; (3) The Turbid Group, whose 

 members are soluble in hot water or in hot alcohol, but the solu- 

 tions become turbid on cooling ; all the members of this group 

 contain catechin. 



The author, however, wishes to make it quite clear that these 

 Groups only refer to Kinos which he has actually examined, since 

 he does not presume that the Kinos he has never seen fall into 

 either one of them, whatever his opinion may be in regard to some 

 of those yet undescribed. It is very possible that fresh groups 

 and sub-groups showing affinities of Kinos may yet require to be 

 erected, but the material at his disposal at present does not justify 

 him in making other than the three broad groups already alluded to. 



