EUDESMIN AND ITS DERIVATIVES. 455 
eudesmin quite readily, but in which aromadendrin is very 
sparingly soluble. The filtered chloroform solution was 
evaporated and the residue crystallised several times from 
methyl or ethyl alcohols or from ethyl acetate. The above 
process was adopted after many comparative experiments, 
and it is especially important to employ a thick aqueous 
solution of the kino for extraction. Inthis way the tannins 
are retained by the water and the formation of a trouble- 
some emulsion, so readily produced by more dilute solutions, 
is avoided. 
The following method of gravimetric determination of 
the eudesmin in eucalyptus kinos has been devised, and is 
now illustrated in the case of the kino of HKucalyptus 
hemiphloia : 
The finely powdered kino (1 gram) was dissolved in 50ccem. 
of water by heating, and the cooled solution extracted 
during several hours with chloroform (10 ccm.), the process 
being then repeated with another equal quantity of chloro- 
form. After remaining during twenty-four hours the 
mixture had resolved itself into two layers; a colourless 
chloroform solution containing the eudesmin, and an aqueous 
liquid containing the tannins. At the junction of the two, 
a quantity of some insoluble substance was deposited. The 
chloroform was separated, and after removal of the solvent 
and heating to 105°, the weight of the residue was 0°1 er. 
Since this residue consisted of almost pure eudesmin it is 
clear that the air dried kino of Eucalyptus hemiphloia 
(with 997% H,O) contains 107% eudesmin. 
PROPERTIES OF EUDESMIN AND ANALYTICAL DATA. 
HKudesmin is readily soluble in chloroform, benzene, acetic 
acid, and ethyl acetate, but sparingly so in cold methyl or 
ethyl alcohols and in ether, It also dissolves to some extent 
in boiling water and crystallises on cooling in slender 
needles. It is best crystallised from methyl alcohol and is 
