— 124 — 



To our several notes 1 ) on Greek turpentine oil from Pinus halepensis 

 we are now able to add the result of an examination by Parry 2 ) who has 

 found two authentic samples to possess the following characters: — 



I II 



d 15 o .............. 0,8605 0,862 



«d . . +36° 45' +39° 



n D20 o 1,4690 1,4736 



Commences to distil at . . 156° 156° 



Fraction 156 to 160° . . . 70% 72°/o 



« D of 156 to 160° fraction +37° 15' +40° 



In addition to the hydrocarbons Z-pinene and sylvestrene, the presence 

 of which in turpentine oil from Pinus longifolia we detected some time 

 ago 3 ), H. H. Robinson 4 ), has found the oil to contain dipentene. Robinson 

 is of opinion that possibly sylvestrene may not be present as such in the 

 original oil, but that the oil may contain a hydrocarbon which, when 

 treated with hydrochloric acid, yields a sylvestrene derivative, in the same 

 way as a hydrochloride results from the treatment of pinene which by 

 splitting off the latter yields camphene. 



When the turpentine from the Douglas fir (Pseudotsuga Douglasii, 

 Carr.) is distilled with steam under low pressure until all the turpentine 

 oil has distilled over, there is left behind a clear, viscous yellow oil 

 (Fir oil) which resembles the so-called pine oil from common turpentine. 

 According to Walker, and also Teeple 5 ), this fir oil contains large pro- 

 portions of terpineol. Benson and Darrin 6 ) have examined a sample of 

 fir oil, and found it to possess the following constants: m. p. below — 40°, 

 [«1d2qo — 37,6°, n D20O 1,4818; solubility in 70°/ alcohol 49: 100, acid v. 1,55, 

 sap. v. 11,1, iodine value 185. From its constitution and its behaviour 

 under fractionation, as well as from the readiness with which terpine 

 hydrate was formed when the sample was treated with 5% sulphuric acid, 

 the authors conclude that at least one-third of the oil consists of terpineol, 

 and that for many purposes it may be found to supply a substitute for 

 pine oil. 



Queysanne 7 ) has proposed a purity-test for turpentine oil based upon 

 its miscibility with aniline, and this same principle was subsequently adopted 



*) Report April 1905, 79; October 1905, 67; October 1909, 69. C 



2 ) Perfum. and Essent. Oil Record 2 (1911), 210. 



3 ) Report April 1911, 116; October 1911, 93. 



-v *) Proceed, chem. Soc. 27 (1911), 247. - 



B ) Comp. Report November 1908, 125. 



«) Journ. Ind. Eng. Chem. 3 (1911), 818. Quoted from Journ. Soc. chem. Industry 

 30 (1911), 1407. 



') Comp. Report April 1910, 115. 



