66 Indian Forest Records. [Vol. iY. 
B previously examined at the Imperial Institute (see Imperial 
Institute Report, dated 18th January 1911):—• 
Present samples. 
Previous 
SAMPLES. 
C* (crude). 
D* (refined). 
A 
B 
Specific gravity at 15° C.. 
0-868 
0-866 
0-871 
0-868 
Optical rotation in 100 mm. 
+0° 20' 
o 
o 
O 
0° 45' 
—2° 10' 
tube. 
On fractional distillation the two oils gave the following per¬ 
centages by volume, compared with those yielded by the previous 
samples A and B and by a sample of rectified turpentine oil 
purchased in London : — 
Present samples. 
Previous samples. 
Rectified nil 
purchased in 
London. 
C (crude). 
D (refined). 
A 
1 B 
Fraction boiling at— 
165° C. or below 
1 
1 
85 
165° C. to 170° C. 
43 
56 
54 
55 
6 
170° C. to 175° C. 
40 
33 
25 
28 
1 
175° C. to 180° C. 
8 
1 
180° C. to 190° C. 
3 
n 
i 
}> 12 
9 
!• 9 
190° C. to 195° C. 
J 
1 
1 
Residue . 
6 
4 
7 
6 
j 
* Samples of C and D were also fractionated at Debra before they were sent to London with the follow* 
ing results :— 
C D 
Below 160° C. 10% 16% 
Between 1(50°—167° C.75% 78% 
Kesidue above 167° C.15% 6% 
(The oil distilled very constantly between 160°—165° C.) 
These results are somewhat different from those obtained for A and B as recorded on pp. 26, 27 and 28 
of this Note, and the difference is probably due to the difference in the age of crude resin that was, in this 
case, distilled in the Laboratory. 
[ 66 ] 
