156 



taste; of 0'92G density. Is a mixture of resin, a volatile and a 

 fat-oil, the latter more slowly drying and more readily soluble in 

 absolute alcohol, than other drying oils. — (c) From P. sylvestris: 

 Brown-yellow, of turpentine-like taste and smell, and of 0"931 

 density; becomes thicker at — 16°, at — 27° whitish and tui'bid, at 

 — 30° solid; dries readily. 



Oil of Piuus Sabiiiiaiia=ABiETEN. 



Oil of Piper Cllbeba. Obtained from the fruits (cubebs) by 

 aqueous distillation. — Colourless, thick; the portion which distils 

 last in rectifying almost of butter-consistence; has a density of 

 0-936; distils mostly at 250°-260°; has a faint aromatic odour, and 

 a warming taste like camphor and peppermint; is of neutral 

 reaction, and consists of a liquid hydrocarbon and an oxygenised 

 stearopten. The hydrocarbon, CubebenrrCso H24, distils first, is 

 less thick than the crude oil, and has a density of 0*9 19. — The 

 stearopten ^Cso H26 O2, is obtained by cold pressing and re- 

 crystallising from alcohol. It forms colourless, klinorhombic 

 prisms of glass-lustre ; smells faintly like cubebs; tastes hot, after- 

 wards cooling; is of neutral reaction; liquefies at 69° to an oil of 

 0'926 density; boils at 150°; sublimates unchanged in small 

 quantities; dissolves readily in alcohol, ether, oils, and acetic acid, 

 not in alkalies. 



Oil of Piper ail<>'1lStifolilim (matico). Obtained by distillation 

 from the leaves. — Pale-green, somewhat thick, of a strong, cam- 

 phoraceous smell and taste ; is, when long kept, heavier than water, 

 becomes thicker, and at last crystalline. 



Oil of Pil)er lli«TniU (pepper) - C20 Hie. Obtained from the 

 fruits l)y distilling with water. — Coloui'less, thin, of a hot peppery 

 taste and smell, and 0-864 density; boils at 167-5° to 170°. 



[Oil of Pittosiioniin Ulldulatuin. Obtained from the flowers 

 by distillation. — Limpid, colourless, lighter than water; of an 

 exceedingly agreeable, jasmine-like odour; taste disagreeably hot 

 and bittei', slightly reminding of turpentine and rue. — Reji. of 

 Exil, of 1862.] 



Oil of Pojiulus (poplar). Obtained by aqueous distillation from 

 the leaf- buds of P. nigra and other species. — Colourless, lighter 

 than water ; of jjleasant, balsamic odour. 



Oil of Primula Auricula. See Primrose-Stearopten. 



[Oil of Prostailtliera. Obtained from the leaves by aqueous 

 distillation. — P. Lasianthos: Greenish-yellow, of mint-like odour 

 and taste, and 0-912 density. — P. rotundi folia: Of darker colour 

 and 0.941 density, otherwise resembling the foregoing oU. — Pep. of 

 Exil. 0/1862.1 



