AROMADENDRIN FROM EUCALYPTUS KINOS. 141 
Theory requires for this formula— 
61°484 Carbon 
4593 Hydrogen 
33'923 Oxygen 
This agrees very well with the percentage amounts obtained by 
experiment. 
Combustion made on material before heating to 120° C. was not 
satisfactory, the results of three combustions not being sufficiently 
constant It was found that 8-86 per cent. of water was removed 
by heating from 120° to 130°C. in air oven, while by heating in 
water bath until constant 6:1 per cent. was removed. Taking 
the formula as given above it is seen that it requires three 
molecules of water to equal 8:71 per cent., so that Aromadendrin 
crystallizes with three molecules of water ; two of these molecules 
are removed at or below 100° C., while the other is removed 
between that temperature and 120° C., the formula for this body 
is before heating therefore O,,H,,0,.+3 H,O. The removal of 
these molecules of water does not form coloured anhydrides when - 
not heated beyond 120° ©. the substance remaining quite white. 
When heated to melting kino-yellow is formed. 
SoLuBILITY oF AROMADENDRIN IN Coup WATER. 
A portion of the purified substance was dissolved in warm 
water and allowed to cool to 15°5° C.; when the greater portion 
of the substance had crystallized out. This was filtered off, and 
& portion of the filtrate evaporated to dryness ; it was found that 
the residue equalled -036 per cent. only, soluble in cold water at 
the temperature given, or that it required 2,777 parts of cold 
water of that temperature to dissolve one part of Aromadrendrin. 
Several attempts were made to form salts, but owing to their 
matability, the results were not very satisfactory. The lead pre- 
Cipitate obtained by adding lead acetate to a hot strong solution 
appeared the most satisfactory. The lead precipitate thus obtained 
left 45 per cent. of PbO on ignition, this corresponds to half the 
