— 95 — 



equal volumes water and oil are shaken, and the mixture left standing, 

 two transparent layers should be formed. 



Pine Needle Oil (from Pinus silvestris) (01. pini foliorum ; ol. pini 

 silvestris) 1 ). Colourless or bright yellow; d 15 o 0,870 to 0,890; soluble 

 in 7 parts 95 per cent, alcohol, less readily in 70 per cent, alcohol. 



*) As the oil distilled from the needles of Pinus silvestris L. has a less pleasant 

 odour, and cannot be obtained in commerce, and as moreover the name Ol. pini 

 silvestris is an old but incorrect designation of oil from cones of AMes alba, it would be 

 more correct to require 01. templini, whose specific gravity lies between 0,850 and 0,870. 



Rose Oil (OL rosae). Colourless 1 ), or faintly yellowish; d 15 o 0,87 

 to 0,89 2 ); readily soluble in ether and chloroform, less readily in 

 90 per cent, alcohol 3 ); at -j- 18 to 21 separation of needle-shaped 

 crystals; at -(- 5 solidification to a crystalline mass; when 1 part oil 

 of o° is dissolved in 5 parts chloroform, and 20 parts 90 per cent, 

 alcohol are .added, brilliant crystals separate out after some time; the 

 liquid separated off from the crystals must not impart a red colour 

 to blue litmus paper 4 ). 



*) Rose oil is never colourless, but always yellowish. 



^ As the oil, owing to separation of paraffin, is usually already solidified at 

 -|- 1 5 , it is advisable to determine the specific gravity at a higher temperature : 



d 15^ °' 849 to °' 863 * 



3 ) In consequence of its paraffin-content, rose oil does not, as a matter of fact, 

 form a clear solution with 90 per cent, alcohol. 



4 ) This test is untenable, as rose oil is slightly acid; acid number 0,5 to 3,0. 



Rosemary Oil (OL rosmarini). Colourless or yellowish; 

 d 15 o 0,90 to 0,92; «d to the left 1 ); soluble in every proportion in 

 90 per cent, alcohol 2 ). 



*) Pure rosemary oil should always be dextrogyre; laevorotation would point 

 to adulteration with French oil of turpentine. Compare the present Report p. 82. 



2 ) Initial turbidity must be attributed to the water which is always present in the oil. 



Sandalwood Oil (OL santali). Faintly yellowish; d 15 o 0,970 to 

 0,980 x ); boiling point 300 02 ); soluble in 5 parts 70 per cent, alcohol. 



x ) The specific gravity lies between 0,975 and 0,985 (15 ). 



*) An actual boiling point in the case of an oil which consists of several 

 components, is out of the question. 



Spearmint Oil (01. menthae crispae). Colourless or yellowish, 

 becoming thicker and darker on exposure to the atmosphere ; 

 d 15 o 0,900 to 0,940; readily soluble in 90 per cent, alcohol 1 ). 



*) The dilute solution has an opalescent turbidity. 



Thyme Oil (01 thy mi). Colourless or yellowish 1 ); d 15 o 0,90 

 to 0,91 2 ); soluble in every proportion in 90 per cent, alcohol; phenol- 

 content at least 20%. 



x ) Even rectified oils frequently acquire again rapidly the red-brown colour of 

 the crude oil. 



2 ) As the oils have occasionally a higher specific gravity than 0,91, it would 

 be more correct to require an oil whose specific gravity does not lie below 0,90. 



