— 9 i — 



*) Fennel oil is often a little heavier, up to 0,977. 



2 ) Com p. the corresponding note in the discussion of the Dutch Pharmacopoeia 

 under fennel oil, p. 86. 



Lavender Oil {Essentia lavandulae). Colourless, yellowish, or 

 greenish yellow; d l5 o 0,885 t0 0*895; soluble in 3 parts 70 per cent, 

 alcohol; content of linalyl acetate (determined after neutralising the 

 free acid) at least 29,4 °/ . 



Lemon Oil [Essentia citti). Bright yellow; d^o 0,85s 1 ) to 0,861; 

 «D-j-58 to -f-65 ; soluble in 5 parts spiritus, the solution may be 

 opalescent. 



*) Sometimes good oils occur with a spec. grav. of 0,857. 



Menthol {Mentholum). Needle-shaped colourless crystals; m. p. 42 

 to 43 ; b. p. 212 ; almost insoluble in water, readily soluble in alcohol, 

 ether, and chloroform ; test for thymol ; 0,1 g. menthol must be com- 

 pletely volatile at the temperature of the water bath. 



Methyl Ester of Salicylic Acid {Methylum salicylicum , essence 

 de wintergreen) 1 ). Colourless; d^o 1,18 to 1,19; b. p. 220 ; sap. no. 

 not below 360; sparingly soluble in water, soluble in alcohol and ether; 

 ferric chloride reaction. 



1 ) Comp. note under anethol. 



Mustard Oil [Essentia sinapis). Colourless or yellowish; d^o 1,016 

 to 1,025; b. p. about 1 49 ; very sparingly soluble in water, readily in 

 alcohol, ether, and carbon disulphide; content of isothiocyanallyl at least 

 94,2 °/ l ); sulphuric acid test; test with ferric chloride. 



1 ) The pharmacopoeia specifies the determination in the same manner as the 

 German Pharmacopoeia IV, but if carried out strictly the values obtained by it are 

 too low. Comp. Report April 1906, 45. Determinations carried out by us with 

 our own distillates gave in the case of natural mustard oil a content of about 94 %> 

 and with artificial oil about 98°/ isothiocyanallyl. 



Nutmeg Oil {Essentia myristicae). Colourless or yellowish; di 5 o 0,865 

 to 0,920*); soluble in 3 parts alcohol. 



*) The upper limit of value is given too low, and should be 0,930. 



Orange blossom Oil {Essentia auraniii citri floruni). Yellowish, 

 becoming brown in daylight; d^o 0,870 to 0,880; sap. no. 20 to 55; 

 soluble in 1,5 to 2 vol. 80 per cent, alcohol with blue-violet fluores- 

 cence; when more alcohol is added the solution becomes cloudy. 



Orange Oil, bitter {Essentia aurantiorum corticum). Yellow or 

 brownish; d 15 o 0,848 to 0,852*); forms a cloudy solution with alcohol. 



*) The spec. grav. quoted has reference to the oil of the sweet orange; oil 

 of bitter orange has di.50 0,854 to °>^57« 



Peppermint Oil {Essentia menthae). Colourless or yellowish; 

 °45° 0*900 to 0,920*); soluble in an equal vol. alcohol; colour- 

 reaction. 



*) Comp. note in the Dutch Pharmacopceia under peppermint oil. 



