146 



fruit in the same manner, and has the same composition as the 

 preceding. It resembles oil of lemon. 



Oil of Citrus Berg'aniia (bergamot). Prepared like oil of C. 

 Aurantium, from the fruit. — Colourless, thin, of very pleasant 

 odour; of 0'860-0"870 density; boils at 183°. Is a mixture of a 

 hydrocarbon =zC2o Hig, and a hydrate of the same. 



Oil of Citrus Liniettil = C2o Hi«. Obtained like oil of lemon, 

 and greatly resembling it. 



Oil of Citrus medica (lemon) rzC2o Hig. Obtained like the 

 preceding. — Colourless or yellowish, thin; of pleasant lemon-odour, 

 and 0-840-0-860 density; boils at 160°-175°. 



Oil of Coclllearia officinalis (scurvy grass) = 03 H5 SO. Ob- 

 tained by distillation with water from the herb of Cochlearia 

 officinalis, C. Danica and C. Anglica. — Possesses the pungently 

 acrid smell and taste of the green herb in the highest degree; has a 

 densityzrO'942. — The so-called Cochlearia stearopten, which forms 

 in the aqueous and spirituous distillates of the herb, is a substance 

 crystallising in small iridescent laminae and needles of a faint 

 odour, but acrid aromatic taste; of 1-248 density; fuses at 45°, 

 sublimates unaltered, and consists of Ce H7 O2 (Cq H5 + 2 HOir 

 hydrate of allyl). 



Oil of Convolvulus scoparius and C. floridus (rosewood). 



Obtained by distilling the root and stem with water. — Pale-yellow, 

 thin, lighter than water; smells of roses and cubebs, a little rancid; 

 has a bitter, aromatic taste. 



Oil of Coriaudruni sativum (coriander) = C2o His O2. Ob- 

 tained by aqueous distillation from the fruits. — Colourless or 

 yellowish, of the smell and taste of the fruits; neutral; of 0'859— 

 0"871 density; boils at 150°, but not constantly. 



Oil of Corylus Avellana. See Hazelnut-Oil. 



Oil of Crocus sativus. Obtained by distillation with water 

 from the stigmata. — Yellow, thin, lighter than water, of the 

 specific odour of saffron; becomes slowly converted into a solid 

 mass, which sinks in water. [The oil is, according to Eochleder, a 

 decomposition product of crocin.] 



Oil of Croton Eluteria and C. Sloaui (cascarilla). Obtamed 



by distillation with water from the bark. — Dark yellow; smells of 

 camphor, lemons, and thyme; has an ai-omatic, somewhat bitter 

 taste; of 0-938 density; begins to boil at 180°, the boiling point 

 lising afterwards. Consists of, at least, two different oils, the more 

 volatile of which is probably a hydrocarbon. 



Oil of Croton Ti«'lium= Croton Oil. 



