-•8 5 - 



*) More correct would be 0,89 to 0,92. 



2 ) Pure rosemary oil is dextrorotatory; laevorotation would point to adulteration 

 with French oil of turpentine. 



3 ) Rosemary oil is also frequently not soluble in every proportion in 85 per 

 cent, alcohol. 



Sandalwood Oil, East Indian (Esencia de sdndalo). Bright 

 yellow; (I150 0,970 to 0,985; «d to the left; neutral or weak acid 

 reaction; readily soluble in alcohol. 



Sassafras Oil [Esencia de sasafrds). Freshly distilled colourless 

 or bright-yellow; subsequently yellow to reddish; d 15 o above 1; «p to 

 the right; neutral reaction; soluble in 4 to 5 parts 85 per cent, alcohol. 



Sweet orange Oil {Esencia de naranjd). Obtained from the 

 peel of the fruit of Citrus aurantium Risso by expression or distillation 

 by water vapour 1 ); colourless or bright yellow 2 ); diso, according to 

 the method of production, 0,835 to °^44 3 ); «d-[-82 04 ); readily 

 soluble in absolute alcohol, ether, and fatty oils. 



*) It is not expedient to produce the oils by ordinary distillation with water 

 vapour, as distilled oils readily deteriorate and then acquire a stale, unpleasant odour. 



2 ) Only the distilled oils are colourless, the colour of expressed oil is yellow 

 to yellow-brown. 



3 ) The specific gravity of sweet orange oil lies at 15 between 0,849 and 0,853; 

 distilled oils are somewhat lighter. 



4 ) Commercial oil at 20 rotates between -)- 95 30' and -\~ 98 ; to what kind 

 of oil the rotation mentioned above applies is incomprehensible. 



Terpin hydrate (Terpind) 1 ). Colourless and odourless prisms 

 which melt at 11 6° with loss of water; soluble in 250 parts cold and 

 32 parts boiling water, readily soluble in alcohol and ether, further in 

 glycerin and in oil of turpentine; when boiled with greatly diluted 

 sulphuric acid, terpineol is formed; it must not have a turpentine 

 odour, and its aqueous solution must not redden litmus paper; burns 

 with a highly luminous flame without leaving any residue. 



*) The Pharmacopoeia mentions terpina, but means terpin hydrate. As terpin 

 and terpin hydrate are two different compounds, a more exact description would 

 have been necessary. 



Terpinol 1 ) Colourless or faint yellow; di 5 o 0,852; ap+0 ; 

 boiling point 168 ; dissolves with great difficulty in water; soluble in 

 alcohol and ether. By the action of nitric acid it is converted into 

 terpin hydrate. 



2 ) A compound terpinol does not exist. What used to be called terpinol 

 is, according toWallach's researches, a mixture of terpineol and terpenes. Comp. 

 Liebig's Annalen 230 (1885), 271. 



Thyme Oil {Esencia de tomilld). Colourless or yellowish 1 ); 

 di5°o,89 2 ); a D to the left; neutral reaction; soluble in an equal volume 

 85 per cent, alcohol. 



