26 HENRY G. SMITH. 



When a glucosidal Eucalyptus kino is hydro-Used by boil- 

 ing with sulphuric acid a "kino red" is formed in quantity, 

 and the sugar appears to be scarcely changed into simple 

 glucoses at this' stage, because only a trace of an osazone 

 insoluble in hot water was formed from it when thus 

 separated. 



It thus appears probable that this tannin diglucoside, 

 found in those Eucalyptus kinos which occur principally in 

 the bark of certain species, takes the place of melitose 

 found in those barks (E. punctata for instance) in which 

 the tannin does not occur in sufficient amount to form a 

 compound with the sugar present. Besides the tannin in 

 the kinos of this group is different. 



There appears to be no record that melitose (Eucalyptus 

 manna) lias ever been found on any species of Eucalyptus 

 the kino of which contains this tannin diglucoside, nor on 

 any species whose kino contains an identical tannin, but 

 which is free from sugar in combination. This suggests 

 the idea that melitose itself may be a glucoside, in which 

 a member of the glucose group takes the place occupied 

 by the tannin in the diglucoside. E. Fisher and E. F. 

 Armstrong have synthetically prepared 1 several disac- 



charides, as 



Glucosidogalactose 



Galactosidoglucose 



Galactosidogalactose 

 which have the properties and behave like glucosides. A 

 similar combination may perhaps be produced with the 

 sugar of these kinos and the necessary member of the 

 glucose group to form melitose, attempts in this direction 

 will eventually be carried out. 



The tannins occurring in this glucoside, and also that of 

 the kinos of the "Stringybarks," as E. macrorrliyncha etc., 



1 Ber. 1902, 35, 3144. 



