THE ESSENTIAL OILS OF TWO LEPTOSPERMUMS. 167 
It possessed the following characters:— 
Specific gravity at 15° C., 0°8990. 
Optical rotation, + 14:12°. 
Refractive index 20°C., 1°4810. 
Solubility in 80% alcohol (by weight), sol. in 7 vols. 
Ester Number Hot 14 hours, 2-04. 
Ester Number Hot, 14 hours after acetylation, 63:24. 
On distillation at 10 mm. the crude oil yielded 62% boil- 
ing at 50-70°C.; 13/ at 70-110°C.; and 22% between 
110 — 140° C. These fractions possessed the following 
constants :— 
Specific gravity at 15° C. 0°8793, 0°9119 and 0°9335 respect. 
Optical rotation + 149° +9°6. ,,..+15°2°. ,, 
Refractive index 20°C. 1°4695 1°4782 ,, 1°5011_ ,, 
Determination of Terpenes.—Repeated fractionation of 
the oil boiling at 50 —70° C., and removal of cineol by means 
of resorcin solution, resolved it into about equal volumes 
of the following fractions :— 
Boiling point. 155 - 160° O. and 160—166° ©. 
Specific gravity at 13° C. 0°8642 0°8645 
Optical rotation +17°5° +11°2° 
Refractive index at 20° O. 1°4716 le Wiss) 
The first readily gave a good yield of nitrosochloride 
which melted and decomposed at 109°C. The second por- 
tion on oxidation with alkaline permanganate solution by 
the method described in “‘ Parry’s Essential Oils,’’ second 
volume, page 37, yielded crystals of sodium nopinate in 
quantity. These on decomposition with dilute sulphuric 
acid yielded the free acid which on recrystallisation from 
benzene melted at 127° C. 
The terpenes are therefore u and # pinene. 
Determination of Cineol.—On subjecting the resorcin 
solution washings from the terpenes to steam distillation 
a small amount of impure cineol was obtained. Its be- 
