— 103 — 



possessed the following properties: b. p. 260 to 268°^ d2o° 0,8725, 

 n D20° 14903, mol. refr. found 67,63, calc. for C 15 H 24 /3~67,86. With 

 hydrochloric acid, the reconstituted hydrocarbon again yielded the tri- 

 hydrochloride, m.p. 79 to 8o°. With hydrobromic acid the corresponding 

 compound of m.p. 84° is formed. 



The molecular refraction and the absorbent powers of the hydro- 

 carbon point to its possessing three ethylenelinkings. It is true that 

 this assumption is apparently contradicted by the fact that the ses- 

 quiterpene only absorbs four atoms of bromine (with immediate dis- 

 colouration) but this behaviour may be explained by the presence of 

 conjugated double-linkings. 



These results warrant the conclusion that the sesquiterpene of pine- 

 needle oil is identical with that of oil of limette x ) and oil of opoponax 2 ). 



In the course of our examination of oil of lemon 3 ) we have also 

 occupied ourselves in some detail with this sesquiterpene, and we were 

 able to show that the sesquiterpenes of oils of bergamot, camphor, 

 lemon, limette and opoponax and that of oil from Piper Volkensii C. D. C. 

 are identical with the bisabolene already discovered in 1897 by 

 Tucholka in Bisabol Myrrh. 



Oil from the Leaves of Ribes nigrum. We have already 

 on a previous occasion 4 ) reported on an oil from the buds of the 

 black currant, Ribes nigrum L. (Saxifragacese), as well as on the bodies 

 which are contained in the leaves of this plant 5 ). A communication 

 has now been published by Huchard 6 ) concerning an essential oil 

 distilled from the leaves. By the process of decomposition this oil 

 yields quinic acid, also a very active oxydase; a new and most 

 remarkable occurrence in the case of an essential oil. No constants 

 or other properties are recorded, but we are informed that the oil 

 is said to have a diuretic action. 



Rose Oil, Bulgarian. The advantageous weather which pre- 

 vailed during the months of March and April has resulted in the 

 normal development of the flowers, in consequence of which the ex- 

 pectations which were entertained of this year's crop have been realised 

 in every respect. According to the reports to hand, a total of about 

 4319 kilos has been produced, and although this result does not come 

 up to that of the record crop of 1903 (6250 kilos), it may yet be 



*) Burgess and Page, Journ. chem. Soc. 85 (1904), 414; Report October 1904, 54. 



2 ) Report October 1904, 67. 



3 ) Gildemeister and Miiller: Beitrage zur Kenntnis des Citronenoles (Wallach 

 Jubilee-publication, Gottingen 1909). Comp. p. 62 of this Report. 



4 ) Report April 1907, 106. 

 : ) Report April 1906, 107. 



e ) Journal des Practiciens; through The Practitioner 1909, 428. From the 

 Pharmaceutical Journal 82 (1909), 528. 



