— 9 2 — 



Rose Oil [Essentia rosae). Bright yellow; soluble in an equal vol. 

 chloroform; the oil is again partly precipitated from the solution by 

 the addition of alcohol. When the liquid oil is cooled to 18 to 2 1°, 

 crystals of needle- or leaflet -shaped separate off from it. 



Rosemary Oil [Essentia rorismarini). Colourless or yellowish; 

 d^o 0,900 to 0,920; soluble in half its weight of alcohol. 



Rue Oil [Essentia rutae). Colourless or yellowish; d^o 0,833 to 

 0,840; soluble in 2 to 3 parts 70 per cent, alcohol; when cooled it 

 solidifies at -\- 8 or -j-10 . 



Sandalwood Oil, East Indian {Essentia santali). Bright yellow; 

 di 5 o 0,975 to 0,985; b. p. 275 to 295 01 ); santalol-content at least 

 9O°/ 2 ); soluble in 5 parts 70 per cent, alcohol. 3 ) 



*) Comp. Gildemeister and Hoffmann, The Volatile Oils, p. 340, note 2. 

 2 ) We wish to point out specially that the santalol-content is calculated on 

 the formula C |5 H 2 4.0. 



8 ) The solubility mentioned applies to a temperature of 20 . 



Savin Oil [Essentia sabinae). Colourless or yellowish; d^o 0,910 

 to 0,930; soluble in half its weight of alcohol. 



Thymol [Thymolum, essence de thym) 1 ). Colourless, transparent 

 crystals; m. p. 50 to 51 ; b. p. 230 ; very slightly soluble in water, 

 readily in alcohol, ether, chloroform and the aqueous solutions of 

 caustic alkalies; 0,1 g. thymol must volatilise without residue at the 

 temperature of the water-bath; identity reactions and test for phenol. 



*) Comp. note under anethol. 



Turpentine Oil, rectified [Essentia terebinthinae). Colourless; 

 dj.50 0,860 to 0,870; b. p. 155 to 162 ; soluble in 12 parts alcohol; 

 the alcoholic solution must not redden litmus paper moistened with water. 



Wild Thyme Oil [Essentia serpylli). Colourless or yellowish; 

 diso 0,890 to 0,920. 



Supplement to the Pharmacopoeia of the German Empire. 



(3 rd - Edition.) 



The fact that the supplement has acquired a permanent place 

 alongside the pharmacopoeia induces us to discuss here also the articles 

 referring to essential oils, as several of the statements made require 

 to be corrected or supplemented, as they might otherwise lead to a 

 wrong opinion on various oils. 



The strengths of the alcohols are the same as in the German 

 Pharmacopoeia IV, viz., spirit us with 90 to 91,2 per cent, by volume, 

 and spiritus dilutus with 68 to 69 per cent, by volume. 



