- 8 5 - 



are few. The number of officinal oils has been augmented with 

 several, and in addition to anise oil and clove oil, their principal 

 constituents anethol and eugenol have now also been included. 



The data with regard to solubility and specific gravity are given 

 for a temperature of 15 , and in the latter case are compared with 

 water at -j- 4 . We have convinced ourselves by comparative estim- 

 ations that the differences between the specific gravities as compared 

 with water at -|- 15 and at -J- 4 are so slight that for practical 

 purposes they can be neglected, and the specific gravities given in 

 the pharmacopoeia can therefore be taken as if they were based upon 

 that of water at -j- 15 . 



Spiritus fortior, with 95 per cent, (by volume) alcohol; 



Spirit us, with 90 per cent, (by volume) alcohol; 



Spiritus dilutus, with 70 per cent, (by volume) alcohol. 



Anethol {Anetholum). White crystalline mass; d 2 5o 0,984 to 0,986; 

 «d±o°; m. p. 21 01 ); b. p. about 235 ; at 20 soluble in 2 vol. 

 spiritus. 2 ) 



*) The m. p. of pure anethol lies between 22 and 23 , the sol. p. between 

 21 and 22 . 



2 ) For dissolving 1 vol. anethol, 2 to 3 vol. 90 per cent, alcohol are required. 



Anise Oil {Oleum anisi). Colourless or yellowish; diso 1 ) 0,980 

 to 0,990; sol. p. not below 14 ; soluble at 20 in 2 vol. spiritus. 2 ) 



*) It is desirable to determine the spec, gravity at 20 , as at 15 solidification 

 of the anise oil may occur; the limits of value remain the same as at 15 . 

 2 ) Anise oil dissolves in 2 to 3 vol. 90 per cent, alcohol. 



Cajeput Oil {Oleum cajuputi). Blueish green; d^o 0,920*) to 

 0,930; boiling temperature 155 to 180 ; soluble in every proportion 

 in alcohol; when shaken with dilute acetic acid the colour of cajeput 

 oil changes to yellow, in the acid aqueous liquid traces of copper can 

 be detected; cineol reaction with iodine, and test for fatty oil. 



*) The spec, gravity is frequently also slightly lower: 0,919. 



Cherry laurel Oil {Oleum laurocerasi). Yellowish; di 5 o 1,060 

 to 1,067 x ); soluble in 2 vol. spiritus dilutus; if 1 cc. oil is heated 

 with shaking on a water bath with 10 cc. of a 30 per cent, sodium 

 bisulphite solution, the oil should completely dissolve 2 ); hydrocyanic 

 acid reaction. 



*) The lower limit of value is given too high and should be 1,050, and if the 

 oil has a high content of hydrocyanic acid, the upper limit may be exceeded 



2 ) In the concentrated sodium bisulphite solution the bisulphite compound 

 dissolves with great difficulty; complete solution only occurs when about an equal 

 volume water is added. 



Cinnamon Oil, Ceylon {Oleum cinnamomi). When freshly 

 prepared yellow, becoming in course of time yellow-red or brownish, 



