Pharmacopoeias. 83 



iso-Amyl salicylate (Amylium salicylicum). Colourless to yellowish; insoluble in 

 water, easily soluble in chloroform and ether, also in 3 parts of alcohol; boiling point 

 about 290 01 ); di 5 o 1.049 to 1.056; proof of identity by means of ferric chloride. 



x ) Our own preparations gave a boiling point of 276 to 277° (743 mm.). 



Anethole (Anetholum). White crystalline mass, smelling of aniseed oil and tasting 

 exceedingly sweet, melting to a colourless, optically inactive, very refractive liquid; 

 boiling point 232 to 234°; melting point 22 to 23 01 ); d 25 o 0.984 to 0.986. 



x ) In compounds melting at such a low temperature, it is preferable to determine the solidification point 

 which is between 21 and 22°, if the liquid is cooled down to -f 16°. 



Bergamot Oil (Oleum bergamottce). Greenish-yellow to green in colour, occasionally 

 also honey-coloured; d 150 0.881 toO.886; « D + 8 to +20 01 ); soluble in 0.25 to 0.5 vo- 

 lumes of spirits of wine, the solution must not become turbid on adding more spirits 

 of wine 2 ); evaporation-residue at the utmost 6 per cent; linalyl acetate content at 

 least 36 per cent. 3 ). 



*) The upper limit is too low, it ought to be 22°. 



2 ) A slight opaqueness is often observable in otherwise quite first-rate oils. 



3 ) Oils with the demanded minimum ester content are not always obtainable, so that one often has to be 

 satisfied with 34 per cent, linalyl acetate. 



Cajuput Oil, rectified (Oleum Cajuputi rectificatum) . Colourless to yellow; con- 

 stants; diso 0.915 to 0.930; « D laevorotation, up to — 4°; soluble in any quantity of 

 alcohol; test for absence of copper; the crude oil contains copper, but otherwise 

 shows the same properties as the rectified product. 



* Carvone (Carvonum). Colourless or light yellowish; boiling point 229 to 230°; 

 di 6 o not below 0.960 1 ); « D -j-50 to +62°; soluble in two parts of diluted alcohol. 



x ) One ought to demand a specific gravity not less than 0.963. 



Cassia Oil (Oleum Cinnamomi Cassice). Yellow to brownish; di 5 o 1.055 to 1.070; 

 soluble in 3 parts of diluted alcohol, giving a clear or only slightly opalescent solution, 

 and soluble also in every quantity of spirit. Residue on evaporation, when one gram 

 is evaporated, at the utmost only 8 per cent. 1 ); cinnamaldehyde content (determined 

 by the sodium bisulphite method) at least 74 percent. 2 ). 



r ) Cassia oil only evaporates slowly because it consists mainly of high boiling constituents, accordingly 

 it must remain a very long time on the water-bath, otherwise the evaporation is not complete and, in consequ- 

 ence, the results are too high. The distillation-test, described in detail in Gildemeister's text-book (2 nd ed., 

 Vol. II, page 440) on Volatile Oils, is to be preferred owing to the difficult volatility of cassia oil. 



2 ) A fair commercial product contains 80 per cent, of aldehyde and more. 



Chamomile Oil, Essential (Oleum Chamomillce ccthereum). Viscous, at low tempe- 

 ratures having almost the consistency of butter; intense dark blue which colour gradually 

 changes to green and brown under the influence of light and air; d 15 o 0.925 to 0.940 1 ). 



*) These limits ought to be increased in both directions. 



Coumarine (Cumarinum). Colourless, glistening, sublimable prisms which dissolve 

 with difficulty in cold water, easier in boiling do; easily soluble in alcohol and ether 

 and in warm caustic soda. Melting point about 70°; combustion-residue at the utmost 

 1 percent.; test for absence of acetanilide. 



Cubeb Oil (Oleum Cubebarum). Occasionally colourless, mostly light-green to 

 blue-green: d 15Q 0.915 to 0.930; « D — 25 to —43°. 



Cypress Oil (Oleum CupressiJ. Yellowish; d 15 o 0.868 to 0.900; « D -f- 4 to +31°. 



o* 



