xv, 4 Oshima: Formosan Termites 359 
of these two are not high, it is probable that the main part of 
the oii consists of a group of sesquiterpene alcohols. 
Fractionation of the neutral oil — Two hundred grams of 50 
per cent aqueous solution of sodium hydroxide are added to 
100 grams of the crude oil, and the mixture is shaken for two 
hours. Then ether is added in order to separate the oil from 
the solution. Eliminating the ether, the neutral oil is obtained 
free from acid and phenol. About 80 per cent of the crude 
oil is neutral oil having the following properties: 
Table XVII. — Properties of the neutral oil from cypress pine. 
Specific gravity (at 10°C.) 1.009 
Refractive index (at 19 °C.) 1.5090 
Optical rotatory power ( [“] D in 20 per cent ethyl 
alcohol) (degrees) +19.5 
Ester value 33.75 
Ester value after acetylation 162.5 
These ester values indicate the presence of about 58 per cent 
of alcohol (C 15 H 26 0) in the neutral oil. 
This oil evaporates at 120° C. under reduced pressure (4 
millimeters), thus indicating more clearly the presence of ses- 
quiterpene alcohol. 
The result of a fractional distillation of a 50-gram sample 
of the neutral oil is shown in Table XVIII. 
Table XVIII. — Fractions obtained from the neutral oil of cypress pine. 
Distilling point; pressure, 4 mm. 
Yield. 
°C. 
Grams. 
Per cent. 
115 to 119 ... 
11 
18.0 
119 to 125 
23 
37.7 
125 to 135 
2 
3.3 
135 to 145 __ 
7 
11.5 
145 to 170 
6 
9.8 
The fractional distillation is repeated three times ; and, finally, 
the results recorded in Table XIX are obtained. 
Table XIX. — Final fractions from the neutral oil of cypress pine. 
Distilling point; pressure, 3.6 mm. 
Yield. 
Refrac- 
tive 
index. 
Rotation 
[o]D 
°c. 
110 to 115 
Grams. 
7 
1. 5045 
Degrees. 
+ 10 
115 to 122 
16 
1. 5066 
-H0.6 
122 to 128 
11 
1. 5082 
+21. 1 
128 to 142 
9 
1. 6095 
+24.6 
142 to 165 . 
6 
1. 5128 
+36.4 
