28 HENRY G. SMITH. 



otherwise. At present the kino of E. pllularls seems a 

 desirable one for this purpose. 



It will also be necessary to obtain a quantity of the sugar 

 by the decomposition of the glucoside, so tliat its chemistry 

 may be determined. So far as this investigation has gone, 

 it appears that as the sugar is inactive to light it cannot 

 be that portion of the melitose molecule known as melibiose, 

 because that is dextrorotatory. C. Scheibler and E. 

 Mittelmeier (Joe. cit.) show the final inversion products of 

 melitose to be as follows: — 



CaHaAa + 2 H.O = C c H 12 6 + C 6 H ]2 6 + 6 H 12 6 

 Galactose Dextrose Levulose 

 but that it first splits up into 



ChMtJOn + C 6 H 12 (3 

 Melibiose Levulose. 

 As the sugar of the glucoside is inactive to light, it is 

 supposed that the optical activity is neutralised by internal 

 compensation. If this is so, then levulose probably forms 

 a part of the original molecule of the first formed portion 

 of Eucalyptus sugar. The osazone being identical with 

 that obtained from melibiose may not influence the result, 

 because it is well known that several distinct sugars give 

 identical osazones. 



The products formed from the " kino red " by fusion with 

 potash is protocatechuic acid, and this indicates that two 

 hydroxyls in the tannin molecule are in the ortho position 

 relatively to each other, and as the product is the same 

 with the non-glucosidal tannin, the sugar probably replaces 

 the hydrogen atom in one of these hydroxyls, so that this 

 portiou of the molecule becomes 

 OH 



OO 12 H 21 O 10 



That the amount of sugar present represents a diglucose is 



