244. ODOROGRAPHIA. 
impurity, of which there is usually present about 10 per cent. It 
has been suggested that this peculiarity of solubility may form a 
useful means of distinguishing between the two benzenes, or even 
detecting their admixture*. The odour of liquid storax is very 
pleasant and balsamic, especially when matured by age; the recent 
balsam having rather an odour of bitumen and naphthaline. 
The presence of turpentines of the various species of Lariv and 
Pinus as adulterants of liquid storax may, according to Hager, be 
determined by melting a small quantity (say 5 grams) in a test- 
tube, and exhausting it by agitating three times successively with 
petroleum ether. Upon evaporating the solution, the residue 
should consist of styrolene (formerly called styrol) and styracin 
only, should be colourless, bluish opalescent, and of pleasant odour. 
If a turpentine is present the residue is yellowish, and has the 
characteristic odour of turpentine. Good storax yields to pe- 
troleum ether about 50 per cent.; if more is taken up, the 
presence of adulterants may be inferred f+. 
For the detection of crude turpentine in liquid storax, Hager 
also recommends the following test:—Fuse the sample in a test- 
tube by means of a water-bath, then agitate it with half its 
volume of absolute alcohol until dissolved. This is then to be 
thrice shaken up with several times its volume of benzene. The 
decanted benzene solutions are united and evaporated in a water- 
bath from a tared vessel. The residue should weigh 45 to 55 per 
cent. of the sample; it should have a bluish opalescence and an 
agreeable odour. If turpentine is present the residue will be 
yellowish, with an odour of turpentine, and its weight will be 
greater than that stated above f. 
Liquid storax contains styrolene, cinnamic acid, styracin, phenyl- 
propyl cinnamate, ethyl cmnamate, and a small quantity of a 
pleasant smelling substance which is probably ethyl vanillin. 
The chief constituent, however, is the resinous styracin and its 
cinnamic ether §. 
Styracin, or,Cmnyl cinnamate, C;,H;;(OH);, can be isolated 
from liquid storax by filtering hot through a cloth and triturating 
* Pharm. Journ. [8] xi. p. 431. 
+ Ph. Centralhalle, 1874, p. 161. 
} Ibid. 1874, no. 21. 
§ Miller, Ann, Chem. Pharm. clxxxviii. p. 184, and clxxxix. p. 338, 
