ESSENTIAL OILS OF TWO SPECIES OF HOMORANTHUS. | 199 
bodies, which appeared to increase in amount soon after distilla- 
tion of the oil.) 
On distillation at 10 mm. all three crude oils yielded from 
81-85%, distilling below 77° OC. at 10 mm., whilst the last 
two consignments gave 16—187 distilling between 123 — 
142°C.at10mm. The first lot gave 11% distilling between 
72—120° C., 12% between 120—160° C., leaving a resinous 
residue of about 147%, which no doubt partially accounts for 
the high ester and alcohol numbers. 
Determination of d-«-Pinene.—Repeated fractional dis- 
tillation at 20 mm., using a six disc column, of the portion 
of oil boiling below 77 C. at 10 mm. resulted in the partial 
separation of a small quantity of dextro-rotatory constitu- 
ent distilling below 70° C. It had specific gravity at +2° 
0°8313; optical rotation from +8°7 up to +14°9°; refractive 
index at 20° OC. 1°4746. It consisted of da pinene together 
with ocimene, and readily gave a nitrosochloride, which on 
purification, melted and decomposed at 109° C. 
Determination of Ocimene.—Many repeated fractional 
distillations conducted at 10 and 20 mm. were made, but 
it was found extremely difficult to remove the associated 
dextro-rotatory terpene, identified as d-c-pinene, despite 
the high content of the olefinic terpene. The best samples 
separated possessed the following characters:— 
‘Boiling point at 10 mm. 67 — 68° C. 
Boiling point at 20 mm. 75—76° C. 
Specific gravity at +3° OC. 0°8034 
Optical rotation inactive to +0°3° 
Refractive index at 20° C. 1°4857 to 1°4859. 
Its identity was established by the following experiments: 
(1) The readiness with which it absorbed oxygen when 
spread ona watch glass. Instead of volatilising in the 
manner of a true terpene, it readily yielded a tacky resinous 
mass, which gave highly refracting emulsions with alcohol 
or water. 
