148 



ropten=C2o H02 Oe, wliicli is isometric, or identical with hydrate 

 of oil of turpentine. 



[Oil of EriOStemOll SqiliUneilS. Oljtalned by distilling the 

 leaves with water. — Pale-yellow, lighter than water; of a taste and. 

 odour similar to, but milder than, oil of rue. Rej). ofExh. o/'1862.} 



Oil of ExCiTecai'ia. See Tallow, Chinese. 



[Oil of Eucalyptus. Obtained by distillation with water from. 

 the leaves and brauchlets of various s})ecies of Eucalyptus, especially 



E. amygdalina, the first samples of which were exhibited by Baron 



F. V. Mueller in 1854, and subsequently in 18G2 prepared by Mr. 

 Johnson, and especially by Mr. J. Bosisto. — The oils, obtained 

 from different species, often vary very considerably in physical 

 properties, as will be seen by the following short description of a 

 few of the oils: — E. amygdalina: Pale-yellow, thin; of pungent 

 odour, resembling, but coarser than, lemons ; tastes rather mild^ 

 and cooling, afterwards bitter; of 0-881 sp. gr. at 15°; boils at 

 165°-188°; deposits stearopten at — 18°, which melts at — 3°^ 

 becomes resinous at the air. E. oleosa: Thin, mobile, pale-yellow, 

 of mild taste ; flavour camphoraceous, suggestive of turpentine ; 

 odour mint-like ; sp. gr. = 0-911 ; boils at 161°-177°. E.sideroxylon: 

 Thin, limpid, very pale-yellow, taste and smell like E. oleosa ; sp. 

 gr.rzO-923; boils at 155°- 17 8°. E. goniocalyx: Pale-yellow; of 

 pungent, penetrating, rather disagreeable odour; taste exceedingly 

 unpleasant; sp. gr.zrO-918; boils at 152°-175°. E. glohtdus: Very 

 pale-yellow, thin ; of cajeput-like odour, but of less disagreeable, 

 more cooling, and mint- like taste; of 0-917 sp. gr. ; boils at 

 149°-177°. E. corymhoza : Smells slightly of lemons and roses;, 

 tastes slightly bitter, somewhat camphor-like; colourless; of 0'881 

 sp. gr. at 15°. E. obliqiia: Beddish-yellow, of mild odour and 

 bitter taste ; of 0-899 s]). gr. ; boils at 17r-195''; becomes turbid 

 at — 18°. E. jissilis: Pale reddish-yellow; smells similar to the pre- 

 ceding oil; of 0.903 sp. gr. ; boils at 177°-196°. E. odwata: 

 Pale-yellowish with a greenish tinge ; smells aromatic ; sp. gr. ■=. 

 0-899-922; boils between 157° and 199°. E. longifoUa : Of oily 

 consistence; taste aromatic, cooling ; odour fragrant, camphor-like; 

 of 0-940 sp. gr. ; boils at 194°-215^ E. rostrata : Pale yellow to 

 reddish-amber; smells and tastes like E. odorata; of 0-918 sp.gr.; 

 boils at 137^-181°. E. viminalis : Pale yellowish-green; of dis- 

 agreeable, but not penetrating smell; of 0.921 sp. gr. ; boils at 

 159°-182°. All these oils are now manufactured on a large scale 

 by Mr. J. Bosisto, who, by untning energy, by expenditui-e of 

 capital, and by persevei-ance, has succeeded in estabHsliing the 

 Eucalyptus oils amongst the prominent articles of commerce. 

 {Report of the Exhibition 0/1862.) 



The Euca]yi)tus oils dissolve resins, kc, with great ease. 

 These svibstances, arranged according to their diminishing solu- 



