98 ODOROGRAPHIA. 
correspond with “borneol” and “cineol.” It is formed by simple 
elimination of water from the terpine hydrate. 
In order to prepare ¢erpineol, 25 grms. of terpine hydrate are 
boiled with 50 cubic centimetres of aqueous phosphoric acid. It 
is a colourless, very thick liquid, boiling between 215°-218°, and 
is optically inactive. Its sp. gr. at 15° C. is 0°940, and at 20° 
0:935. Bouchardat and Voiry * produced it by heating terpine 
hydrate with very dilute sulphuric acid. It was also probably 
obtained by Deville as a by-product in the preparation of terpine 
hydrate +; it also appears to occur in oil of cardamom from 
Ceylon (Elletaria major). 
The high boiling-point of Terpineol (Dipentenyl alcohol) 
speaks for its unusual resistance to heat, and permits, for perfu- 
mery purposes, of its being used in the manufacture of toilet soaps 
by the warm process. It is readily soluble in vaselin. 
It is further adapted to this use by reason of the property it 
possesses of not being attacked or decomposed by alkalies, such as 
soda or potash. Observations extending over months have shown 
that the odour remains unaffected even in soaps made strongly 
alkaline. These experiments regarding its adaptability to soap 
were made by Schimmel and Co., who recommend, for the pro- 
duction of an extraordinarily fine Lilac perfume, 10 or 12 ozs. of 
Turpineol to 100 lbs. of soap, with the addition of Heliotropin 
(Piperonal), ylang-ylang oil, geranium oil, and East-Indian 
santal-wood oil. ‘The perfume of this soap very much improves 
after storing some time.” 
The odour of hyacinths is also produced artificially as follows :— 
The compound «-Phenylchlorethylene or Phenylvinylchloride was 
first obtained by Stenhouse in an impure condition by the distil- 
lation of cinnamic acid with bleaching-powder solution {. It is 
also formed by the action of sodium-carbonate solution on Phenyl- 
dichloropropionic acid, which is obtained by passing chlorine into 
a solution of cinnamic acid in carbon disulphide ; it crystallizes in 
lustrous plates which melt at 162°-164°, and are insoluble in 
water, but gradually decompose into carbon dioxide and a-phenyl- 
* Compt. Rend. civ. p. 996. 
+ Ann. Chem. Pharm. Ixxi. p. 351. 
} Ibid. ly. p. 3 and lvii. p. 79. 
