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Bihydrochlorate of Cajputene, C 2Q H lg + 2HC1 is obtained by 
mixing the oil with one-third of its bulk of strong aqueous hydro- 
chloric acid, and then passing a current of the gas through the mix- 
ture ; after the lapse of 10 or 12 minutes, the whole solidifies into a 
mass of crystals. These, when purified by expression and crystal- 
lisation from boiling alcohol, melt at 53°, and when repeatedly 
distilled, or when acted on by alcoholic potash, lose one - half of 
hydrochloric acid, and yield the monohydrochlorate. It is entirely 
devoid of taste and smell, and in this respect differs remarkably from 
the isomeric compound obtained from oil of turpentine. 
Monohydrochlorate of Cajputene, C 20 H ]6 + HC1 is an oily fluid, 
with a pleasant ethereal odour. 
Tetrabromide of Cajputene , C 20 H lg Br 4 . Bromine is added to 
the bihydrate, and the mixture left for some weeks, when a granular 
substance is seen to deposit. As soon as this is observed, the whole is 
dissolved in boiling alcohol, and on cooling, glittering scales, resem- 
bling cholesterin, are deposited. It is soluble in alcohol and ether, 
melts at 60°, and may be distilled apparently unchanged. 
Hydriodate of the hydrate of Cajputene. When iodine is added 
to oil of Cajeput, the temperature rises, and on cooling a black 
crystalline compound is deposited. This substance, after purifica- 
tion by cold alcohol, forms black crystals fusible at 80°, and very 
readily decomposed. Its formula is C 20 H lg HO + HI. 
Hydriodate of Cajputene, C 20 H 16 + HI. To obtain this com- 
pound, oil of cajeput is mixed with a solution of iodine in bisulphide 
of carbon, and to this a solution of phosphorus, in the same men- 
struum, is added. A brisk reaction takes place, the temperature rising 
to about 80°. After some weeks fine black crystals are deposited, 
which are soluble in alcohol and ether, and exceedingly stable, 
being unaffected even by alkaline solutions. 
The author proposes to make the composition of the other constit- 
uents of the oil of cajeput the subject of a future paper. 
4. On the Action of Chlorine on Citric Acid. Hexachlorinated 
Acetone. By John Galletly, Esq. 
At the recommendation of Dr Anderson, Glasgow University, I 
have re-examined the oil which Plantamour obtained by acting on 
citric acid with chlorine. Owing to the slowness with which it is 
formed, its complete investigation is somewhat lengthened, and the 
