— 132 — 



uble in alcohol; the solution must be neutral and must not be changed 

 by ferric chloride. 



1 ) Solidification is not always spontaneous at this temperature, but may have to be in- 

 duced by inoculation with a little solid anethol. 



Juniper oil, empyreumatic (Cade oil). (Oleum cadinum) 1 ). Thick, 

 dark brown liquid of a peculiar acrid odour; lighter than water ; sparingly 

 soluble in water, partly in 90% alcohol, readily soluble in ether, chloro- 

 form, carbon disulphide and amylic alcohol. 



*) On cade oil and its properties, comp. our Reports November 1908, 24 and 

 April 1909, 58. 



Lavender oil (Oleum Lavandulae). Colourless or yellowish ; di 6 o 0,885 

 to 0,895; « D to the left; sap. v. not below 84 = 29,4 °/o linalyl acetate; 

 soluble in 2 parts of 90°/o 1 ) and in 3 parts of 70°/o alcohol; the oil turns 

 viscid when exposed to air and in so doing acquires an acid reaction. 



x ) Lavender oil is soluble in any proportion of 90°/o alcohol. 



Lemon oil (Oleum Citri). Clear or slightly turbid; bright yellow; 

 d 15 o 0,855 to 0,865*). 



x ) The limits of value are drawn so wide here that most adulterated oils would answer 

 these requirements; the sp. gr. of pure oil ranges from 0,857 to 0,861 (15°). 



Mace oil (Oleum Macidis). A somewhat thick 1 ), clear, yellowish liquid; 

 di 5 o 0,890 to 0,930; « D to the right; soluble in 3 parts of 90% alcohol, in 

 its own vol. of carbon disulphide; with the last-named the solution turns 

 turbid when more of the solvent is added. 



!) This indication is correct when applied to old, resinified oil; the fresh distillate is 

 mobile and colourless or yellowish. 



Menthol (Mentholum). Acicular, colourless crystals; m. p. 43 01 ); b. p. 

 212° 2 ); readily soluble in ether, alcohol and chloroform, sparingly soluble 

 in water; 2 g. menthol must melt on the water-bath into a colourless, 

 transparent liquid, evaporating without leaving a residue under continued 

 heating; sulphuric acid reaction; test for oily impurities. 



x ) The m. p. lies between 43,5 and 44,5°. 



2 ) Menthol boils at 216° (753 mm.) if the mercury thread of the thermometer is wholly 

 surrounded by steam. 



Mustard Oil (Oleum Sinapis cetMreum). Colourless or yellowish; 

 d 15 o 1,018 to 1,025!); « D ±0°; b. p. 148 to 152° 2 ); soluble in any pro- 

 portion in 90 °/o alcohol; allyl isothicyanate content (determined as thiosin- 

 amine) 92,6 to 100°/ . 



x ) The minimum limit of value is too high; it should be 1,014. 



2 ) The principal fraction of mustard oil boils between 151 and 153°. 



Peppermint Oil (Oleum Mentha? piperitce). Colourless or yellowish, 

 turning more viscous and darker with age; d 150 0,900 to 0,910; « D to the 

 left; soluble in 4 to 5 parts of 70% alcohol; when more alcohol is added 

 the solution turns slightly turbid 1 ); when cooled down to —10° there is 

 an abundant separation of menthol -crystals 2 ). 



