24 HENRY G. SMITH. 



a yellow substance, perhaps identical with myrticolorin, 

 the dye material of which is quercetia and the sugar glucose. 

 In several other species of eucalypts the kino is distributed 

 almost entirely throughout the timber, and tannin hardly 

 occurs in the bark. This I have already shown in my paper 

 on the saccharine and astringent exudations of the "Grey 

 Gum " E. punctata. 1 The kinos occurring in the timber of 

 this latter group usually contain crystallisable substances, 

 as eudesmin, aromadendrin, etc., which appear to be quite 

 absent in those exudations derived principally from the 

 bark, as in the "Ironbarks." It is thus seen that the 

 location governs, to a certain extent, the constitution of 

 the kino in any particular eucalypt. 



The tannin dealt with in this paper is that found in the 

 kinos occurring largely in the bark of these trees, and it is in 

 these kinos that the constituent, which has previously been 

 looked upon as gum, occurs in greatest abundance. The 

 peculiarity of being largely precipitated from a strong 

 aqueous solution by alcohol, together with its practical 

 insolubility in that substance, seems to have been the only 

 reasons for considering it to be gum. During my work on 

 these kinos, now extending over a considerable period of 

 time, it became necessary to determine the class of carbo- 

 hydrates to which this supposed gum belonged. The 

 results were somewhat startling, because it was found that 

 this particular substance is a peculiar tannin diglucoside 

 and not gum. 



The fresh kino of Eucalyptus paniculata was taken for 

 the investigation, because it is typical of this class of kinos, 

 is readily soluble in water, and consists almost entirely of the 

 glucoside. The species is also common in the immediate 

 neighbourhood of Sydney, and it was thus possible to collect 

 in quantity the freshly exuded kino. The eucalypts whose 



1 Roy. Soc. N. S. W., Aug. 1897, p. 177. 



