— 79 — 



dissolves with difficulty in water, readily in Spiritus, ether, and glacial 

 acetic acid. When i gm. eugenol is mixed with 26 cc. water and 

 4 cc. soda liquor (i5°/ ), a clear solution should be formed, which 

 becomes cloudy on exposure to the air. Identity-reaction with ferric 

 chloride and test for phenol. 



*) The absolutely water-free preparation distilled in vacuo, is often also some- 

 what lighter; with our own distillates we have observed down to 1,0713. Comp. 

 also Report April 1902, 72. 



2 ) It is difficult to determine the boiling point exactly as partial decomposition 

 occurs in boiling. 



Fennel Oil ( Oleum fceniculi). Colourless or faintly yellow ; diso 0,9 6 5 

 to 0,975; soluble in an equal vol. Spiritus; when cooled down to a 

 few degrees below o°, fennel oil must separate off anethol crystals 

 which melt again at -f~5 01 )* 



1 ) It would have been better to have substituted for the above, the require- 

 ment of a definite solidifying point which should not lie below -J- 4 . But it should 

 be taken into consideration that the solidification may have to be started by in- 

 oculation with a small crystal of anethol, as under certain conditions it is possible 

 to cool fennel oil strongly without causing solidification. 



Oil of Juniper berries [Oleum juniperi). Colourless or greenish 

 yellow; d^o 0,865 to OjSSo 1 ); dissolves with difficulty in Spiritus 2 ). 



1 ) The limits should here be wider: 0,860 to 0,885. 



2 ) Only the freshly distilled oils dissolve in 5 to 10 vol. 90 per cent, 

 alcohol; in the course of time the solubility diminishes very much. 



Lavender Oil [Oleum lavandulce). Colourless or faintly yellow; 

 d 15° 0,885 to 0,895; very readily soluble in Spiritus. 



Lemon Oil [Oleum cit?i). Bright yellow; di 5 o 0,858 to 0,861; 

 soluble in 5 parts Spiritus 1 ). 



*) Owing to its content of slimy and vegetable wax-like constituents, lemon 

 oil forms mostly only a cloudy solution with 90 per cent, alcohol. 



Mace Oil [Oleum macidis). Colourless or yellowish, becomes in 

 course of time brownish; d^o 0,890 to 0,930; forms a clear solution 

 with 3 parts Spiritus. 



Menthol [Mentholum). Prismatic or needle-shaped colourless crys- 

 tals; melting point 42 to 43 °; dissolves with difficulty in water, readily 

 in Spiritus, ether, and chloroform; 10 gr. menthol must be completely 

 volatile at the temperature of the water-bath, without discolouring. If 

 menthol is added to a mixture of 1 cc. glacial acetic acid, 3 drops con- 

 centrated sulphuric acid, and 1 drop nitric acid no coloration may occur. 



Mustard Oil [Oleum sinapis cethereum). Colourless or yellow 1 ); 

 d 15 o 1,016 to 1,025; boiling point 148 to 152 ; readily soluble in Spiritus 

 and ether, little in water; the aqueous solution decomposes rapidly. 

 Sulphuric acid reaction, and test with ferric chloride. 



*) In the course of time mustard oil acquires a reddish brown colour. 



