61 



■when boiled with potash-ley into a brown resin, which does not 

 rubify the skin. 



Clll)eMu=:C2o Hi6 Oe- Must not be confounded' with cubeb- 

 stearopten. The cubebs, freed from the volatile oil by distillation 

 with water and pressing, are to be dried and exhausted with 

 boiling alcohol. Evaporate the tinctures to honey-consistence, and 

 remove foreign matters by treating with potash-ley; wash the 

 remaining C. with watei', and purify by repeatedly recrystallising 

 in alcohol. — Forms small, white needle-like crystals or silky 

 laminae, neutral, without taste or smell; fuses at 120°, loses at 

 200° nothing of its weight, and decom2:)Oses afterwards; dissolves 

 scarcely in cold, veiy little in hot water, at 20° in 76 parts 

 absolute, and in 140 parts alcohol of 0"850, in ten parts boiling 

 alcohol, in 26 parts ether, little in chloroform ; but in oils, also in 

 acetic acid; is not changed by alkalies, becomes blood-red through 

 concentrated sulphuric acid, and is destroyed by heat; is not 

 changed by hot hydrochloric acid. 



Cumarin =Ci8 Hg O4. Found as yet in the following vege- 

 tables: Aeranthus fragrans, Nigritella alpina, Orchis pui-purea, 

 Anthoxanthum odoratum, Hierochloa borealis and other species 

 of that genus; Asperula odorata, Dipterix odorata, Melilotus offi- 

 cinalis and congeneric plants; fruit of Myroxylon toluiferum ; 

 Herniaria glabra, Liatris odoratissima; bark of Prunus Mahaleb. 

 To prepare it, exhaust with alcohol, distil off the alcohol from the 

 tinctures, let the remnant crystallise and recrystallise in water or 

 alcohol.— Forms colourless silky leaflets, of very aromatic odour, 

 of aromatic and pungent taste ; fuses at 67°, boils at 270° and 

 sublimates unaltered ; is of neutral reaction ; dissolves scarcely in 

 cold, readily in boiling water, most readily in alcohol, ether, vola- 

 tile and fixed oils ; yields by fusion with caustic potash salicylic 

 acid. 



Climillol=::C2o Hi2 Oq. In the volatile oil of the seeds of 

 Cuminum Cyminum and of Cicuta virosa besides Cymen=:C2o IT14. 

 To be looked for in many other Umbelliferaj. The crude volatile 

 oil is submitted to distillation; at 200° the whole of the cymen 

 has distilled besides much Cuminol, the remaining oil is pure 

 Cuminol which has to be distilled in a current of carbonic acid 

 gas. — Colourless or yellowish oil of strong odour of cumin and of 

 acrid, burning taste, of 0'972 density, boils at 220°. 



Curarill=C2o H1.5 N. Alkaloid of the vegetable arrow-poison 

 Curare of South America, obtained from Strychnos Guianensis. 

 To prepare it, boil the curare under addition of a little carbonate 

 of soda with absolute alcohol, distil ofi" the alcohol from the 

 filtered tincture and dissolve the remnant in water; the aqueous 

 solution is thrown down with chloride of mercury, the deposit 



