CHEMISTRY OF AUSTRALIAN MYRTACEOUS KINOS. 33 
lustre resembling spermaceti. It is necessary that the successive 
filtrates obtained from these crystals be placed in a vessel to allow 
of the slow evaporation of the alcohol, so that the remaining 
crystals of eudesmin may form and so be removed, or the filtrates 
may be evaporated to dryness, and again treated with absolute 
alcohol with the aid of a gentle heat, and the previous process 
repeated. If care is taken in the manipulation, it is possible to 
almost entirely remove eudesmin from these solutions, and so 
Separate it from the resinous looking body, which is readily 
soluble in even dilute alcohol. A special reason why it is necessary 
to endeavour to obtain this substance as free as possible from 
eudesmin will appear presently. 
Eudesmin has been found in the kino of Eucalyptus hemiphloia 
F.v.M., (a typical turbid kino); in what other kinos it is contained 
will form the subject of a separate investigation. The kino of 
£. hemiphloia used in these investigations was all obtained from 
one tree, 
Puysica, Properties AND REActTIONS oF EUDESMIN. 
The crystals which are however obtained by slowly evaporating 
an alcoholic solution are rhombic prisms ; larger crystals are 
obtained by slow crystallization from amyl alcohol; these crystals 
extinguish parallel to the principal axis and polarize at times in 
. E bright colours. They show faces of the right rhombic prism with 
brachypinakoids. The termination planes are mostly macrodomes, 
_ Pyramidal faces not having yet been detected. The formula 
therefore is 
(oP +a Po+ Po ) 
Eudesmin is soluble in hot water but crystallizes out again on 
ooling, it possessing but the slightest solubility in cold water. 
Tt melts on the surface of mercury at 99°C. (result of several 
determinations), As it melts below the boiling point of water, 
“are must be taken not to raise the temperature too rapidly or 
too high when determining its solubility in water, as it fuses into 
lobular masses as 100° C. is approached. 
C—Jane 5, 1995, 
