CRYSTALLINE CAMPHOR OF EUCALYPTUS OIL. 99 



After solution of the eudesmol 



First time freezing = 5'22° 



Second „ „ = 5-185° 



Third „ „ = 5-185° 



.*. Molecular value =150 



C 10 H 16 O = 152 



Di-nitro compound. 

 On the addition of strong nitric acid to eudesmol, little change 

 takes place at once in the cold. After a little time it darkens 

 somewhat, the eudesmol becoming liquid and changing to a purple 

 colour. On gently heating until reaction commenced, the colour 

 changed at once to yellow with rapid solution of the substance and 

 evolution of dark brown fumes. After about fifteen minutes the 

 action apparently ceased and if kept cool no more brown fumes 

 escaped. On addition of water a yellow crystalline mass was at 

 once formed. The filtrate remained yellow. The nitro-compound 

 is slightly soluble in cold water, more readily in hot water. It is 

 soluble in alkaline solutions and reprecipitated on acidifying. It 

 was purified from alcohol. When dry it is of a primrose colour. 

 It is soluble in alcohol, ether and acetone, but does not form a 

 well defined crystalline substance with these solvents. It melts 

 at 90° C.j but changes to a deep orange colour at 75° C. 



A determination of the nitrogen gave results as follows : — 

 Material taken = -1147 gram. 

 Moist nitrogen obtained = 11 '5 cc. 

 Barometer =767 mm. 

 Temperature of gas = 16° 0. 

 .-. Nitrogen = 11-8 per cent. 

 CioH 14 (N0 2 ) 3 requires nitrogen 11*57 per cent. 



Dibromide. 

 The purified eudesmol was dissolved in a small quantity of 

 glacial acetic acid and bromine added. This was readily and 

 quietly absorbed, no substitution taking place. The bromide is an 

 addition product. The rise of temperature was prevented as 

 much as possible. The bromide soon separated as a semi-solid 



