340 Messrs. M. M. Pattison Muir and S. Su^iura on 



o 



action of nitrosyl cliloride upon this terpene, and to determine 

 the rotatory power of a cohimn of the liquid. The action 

 of nitrosyl chloride is in every respect similar to that ob- 

 served between the same substance and the terpene from 

 French turpentine oil *. The nitroso-derivativC; Cio H^^ NO, 

 forms monoclinic prisms of the same form as those described 

 by Stor}^ Maskelyne in an appendix to the paper of Tilden 

 referred to : — " The plane ends are replaced by a sort of 

 joyramid, which makes them look more pointed. In general 

 appearance the crystals are not unlike dog-tooth sparf. The 

 melting-point of the nitroso-derivative is 129° ; the alcoholic 

 solution of this substance is optically inactive. The specifio 

 rotatory power of the sage-terpene is [a]D=— 37'3. 



7. The determinations of the optical properties of this 

 terpene agree very closely with those which have been made 

 for the terpene from French turpentine-oil (terebenthene). 

 Moreover the specific gravity of the sage-tcrpene is practi- 

 cally identical with that of terebenthene. Riban| gives the 

 formula 0"8767 — 0"0008277 t as expressing the specific gravity 

 of terebenthene at any temperature, t, below 80°. At 15° the 

 specific gravity would be 0*8643. The specific gravity of sage- 

 oil terpene is 0*8635 at 15°. The boiling-points of the two 

 terpenes are also almost identical, probably really identical. 

 As we shall show hereafter, the sage-terpene contained a small 

 quantity of cymene, which would tend slightly to decrease 

 the specific gravity, and slightly to increase the boiling-point 

 of the liquid. 



In the following Table we have noted some of the physical 

 properties of terebenthene and of the terpene from sage-oil 

 boiling at 157°: — 



Sage-terpene. Terebenthene. 



B.P 157° ]56°-25§ 



Specific gravitv at 15° 0-8635 0*8643 § 



Eefractive indices at 24° for A 1-4611 1-4596 || 



„ „ D 1-4667 1-4653 11 



., H 1-4855 1-4845 || 



Eefractive energy' 0-0534 0-0532 || 



Refraction-equivalent 72-6 72-5 || 



Specific rotatory power (for )^ _ o-.o _ ^9-J. % 



soda-flame) } ^ zp , *^,. i- i\ 



' ^ (lor transition tmtj. 



* See Tilden, Chem. Soc. Journ. [2] xiii. p. 514. 



t Extract from letter frcm Dr. Tilden. 



X Comiites Jloidus, Ixxviii. p. 288. 



§ liilDan, Coiujiies Ihtulus, Ixxviii. p. 288. 



li Gladstone, Pliil. Trans. 1863. 



^ iJertlielot, Ann. C/um. Pharm. Ixxxyiii. 813. 



