37 
Part VI.] Preparation of Turpentine , Rosin and Gum. 
The report being encouraging, further samples were sent to the Imperial 
Institute, London, and to a Bombay firm for valuation, whose reports 
are given below :— 
* (i) Report from the Imperial Institute , London . 
Report on Boswellia gum from India. 
The three samples of Boswellia gum which ar6 the subject of this report were 
forwarded to the Imperial Institute by the Forest Economist, and are referred 
to in Imperial Institute Report dated 5th July 1916. In a letter to the Imperial 
Institute, the Forest Economist referred to certain differences in the results of the 
■examination of the gum as carried out by the Chemical Adviser at Dehra Dun 
and those obtained at the Imperial Institute. These differences related chiefly 
to the amount of resin found in the gums. The samples have therefore been re¬ 
examined at the Imperial Institute, with special reference to this point and to 
their suitability for use in the sizing and finishing of textiles. 
Results of Examination. 
The three samples were analysed with the following results : 
— 
. B(4)a. 
B(4)6. 
F(4)c. 
per cent. 
per cent. 
per cent. 
Moisture ...... 
14-4 
13.9 
12-4 
Ash. 
C-0 
3-5 
9-3* 
Matter soluble in 95 per cent, alcohol . 
23-6 
20-7 
16-9* 
„ „ „ ether 
20-9 
17-3 
11-6 
„ „ ,, cold water . 
42-9 
48-5 
39-2 
Specific gravity of a 10 percent, solution at 
1-025 
1-023 
1-022 
15° = 15°C. 
JViscosity of a 10 per cent, solution at 22°C 
3-6 
3-3 
2-8 
! 
These results are compared in the following table with those obtained by the 
Chemical Adviser, the Imperial Institute results being given under the heading 
A, and those of the Chemical Adviser under the heading B. In order to eliminate 
* The average of five determinations, which varied from 7 3 to 108 per cent, owing 
to the presence of heavy sandy matter it was difficult to obtain a really average 
sample of the material. _ n 
f As compared with 1 for water and 6*5 for soft Kordofan gum, for feudan lain 
gum and 12-0 for hard Kordofan gum, determined under the same conditions. 
[ 339 ] 
