— 8o — 



Neroli Oil {Oleum aurantii florum). When freshly distilled colour- 

 less 1 ) or faintly yellow, becoming darker in the course of time, and 

 finally brown-yellow; d^o 0,870 to 0,880; dissolves very readily in 

 spiritus; the spirituous solution shows a bluish fluorescence. 



1 ) The fresh distillate also is never colourless, but always yellowish. 



Peppermint Oil {Oleum mentha piperita?). Colourless, yellowish 

 or greenish-yellow; d^o 0,900 to 0,910; forms a clear solution with 

 4 to 5 parts spir. dil. A mixture of 5 drops peppermint oil and 1 cc. 

 glacial acetic acid must after a few hours show a blue coloration; the 

 blue colour occurs more rapidly if to 2 cc. oil and 1 cc. glacial acetic 

 acid, 1 drop nitric acid is added 1 ). 



*) Judging from the specific gravity, only English oil is admitted. For this 

 reason it is all the more incomprehensible why the colour-reaction, which applies 

 specially to American oil, has been included, which is of no importance whatever 

 for judging the value of peppermint oil; even with the best Mitcham oil the reaction 

 does not by any means occur in every case, a fact of which we have convinced 

 ourselves repeatedly. In the presence of nitric acid a more or less powerful blue 

 coloration occurs in every case. 



Oil of Pinus pumilio {Oleum pint pumilionis). Colourless; 

 d^o 0,865 to 0,875; commences to boil at 165 ; completely soluble 

 in Spiritus 1 ). 



*) For dissolving I vol. oil, 5 to 8 vol. 90 per cent, alcohol are required; 

 sometimes a clear solution is not formed at all. 



Rose Oil {Oleum rosae). Yellowish; d 2 o° 0,855 to 0,870; solidi- 

 fying point 15 to 22 ] soluble in about 30 parts Spiritus with slight 

 opalescence 1 ). 



1 ) Owing to its content of difficultly soluble paraffins, rose oil always forms 

 only cloudy solutions with 90 per cent, alcohol, from which the paraffins gradually 

 separate out. 



Rosemary Oil {Oleum rosmarini). Colourless or yellowish; 

 ^15° 0,900 to 920; very readily soluble in Spiritus. 



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

 di5<> 0,975 to o^o 1 ); boiling point 275 to 305 ; acid reaction; 

 saponification number 5 to 15 2 ); at 20 to 3 o° forms a clear solution 

 with 5 parts spir. dil. 



*) The upper limit is given too low and should be: 0,985. 



2 ) The saponification numbers of sandal oil lie between 5 and 20. 



Sweet Orange Oil {Oleum aurantii pericarpii). d^o 0,848 to 

 0,852; readily soluble in Spiritus 1 ); in the course of time crystalline 

 .separations occur which are soluble in Spiritus 2 ). 



*) For dissolving 1 vol. oil, 8 to 10 vol. 90 per cent, alcohol are required, but 

 the solution is never perfectly clear on account of the wax-like constituents always 

 present in the oil. 



2 ) The separations which are chiefly of the character of vegetable wax, dissolve 

 with some difficulty in Spiritus. 



