— 99 — 



wood 40,7 °/ , and very rich wood 42,4 °/ . On the whole the balsam 

 was water-white and very mobile; but it became darker on exposure 

 to the air, and gradually became viscid. In the fresh state it had a 

 peculiar aromatic odour; d2o° 0,9821; [a] D — 8,82°; n D20° I >5 1 745; 

 the yield of oil was 22 °/ . 



The oils from the two species of wood show fairly large dif- 

 ferences according to the manner of production, whether by extraction 

 and steam distillation, or by dry distillation. The last-named method 

 yields apparently more complicated products which distil within wide 

 boiling limits. The following table shows the influence of dry distil- 

 lation on compounds with the same boiling point: — 



Terpene from P. resinosa: Terpene from the Douglas fir: 





steam 



destructive 



steam 



destructive 





distillation 



distillation 



distillation 



distillation 



b.p. 



153 to 154 



158 to 160 



153,5 to 154 



157 to 160 



d20° 



0,8636 



0,8666 



0,862 1 



0,8662 



Wd 



+ 17,39° 



- 7,56° 



-47,2° 



- 29,4° 



n D20° 



1,47127 



1,47160 



1,47299 



1,47246 



M. Vezes and M. Mouline have continued, in conjunction with 

 R. Bridon 1 ), their studies on the mutual solubility of oil of 

 turpentine and dilute alcohol. In our note on the first work 2 ) 

 of Vezes and Mouline, we had called attention to the fact that it 

 is important in such examinations, also to give details of the character 

 and the properties of the turpentine oil used. The authors state that 

 the object of examination in the trials under discussion was French 

 turpentine oil, three times rectified, from the Departement des Landes, 

 which had the following constants : d25o 0,8580; «j> — 33, i°; n r>25° M665. 

 The conditions of the tests were on the whole the same as in the 

 earlier tests, and the results confirm or amplify those previously obtained. 

 The more dilute the alcohol used for the mixture, the more necessary 

 it is to raise the temperature in order to bring about a homogeneous 

 mixture with the turpentine oil. The authors have summed up their 

 results in a number of tables, and give the separation - curves for a 

 large number of mixtures of turpentine and alcohol, for alcohols of 

 various degrees of concentration. One curve illustrates the preparation 

 of those mixtures, of which it is certain that the turpentine -alcohol 

 mixtures produced in accordance therewith with alcohols of different 

 strength, do not become cloudy even when strongly cooled (several 

 degrees below o°). 



1 ) Reprint from the Proces -Verbaux des Seances de la Soc. des sc. phys. et 

 nat. do Bordeaux, June 28, 1906. 



2 ) Bull. Soc. Chim. III. 31 (1904), 1043; Repoit April 1905, 76. 



7* 



