38 
Indian Forest Records . 
[Vol. VI 
discrepancies due to variation in moisture the results have been 
cases on the dry materials :— 
expressed in all 
Specification. 
Samile B(4)a. 
Sample B(4)5. 
Sample B(4)c. 
A. 
B. 
A. 
B. 
A. 
B. 
\ 
% 
% 
% 
% ■ 
% 
Ash .... 
3 5 
3-4 
4-1 
4-0 
10-6 
7-1 
Resin (matter soluble in, 
95 per cent, alcohol). 
27-6 
not 
given. 
24-0 
10-2 
19-3 
21-2 
Soluble gum (matter 
soluble in water). 
50-1 
Do. 
56-3 
not 
given 
44*8 
not 
given 
Insoluble gum and dirt 
(exclusive of ash). 
18-8 
Do. 
15-6 
Do. 
25-3 
Do 
Matter soluble in ether 
(dry and free from 
alcohol). 
24-4 
9-0 
20-1 
9-4 
13-2 
18-3 
1 
1 
8-3 
19-4 
■ It will be seen frdm these figures that the results obtained at the Imperial 
Institute for matter soluble in alcohol and in ether (which for either solvent mav 
be regarded as resin) are similar to those quoted in the previous Imperial Institute 
Keport and do not agree with those found by the Chemical Adviser.* 
Sizing Trials. 
The following experiments were conducted at the Imperial Institute with a 
view to obtaining “ jellies ” from the gum_ 
(a) One part of the gum was allowed to stand over-night with 2 parts of 
water, and was then heated for 1 hour in a boiling water bath and 
allowed to cool. Only a pasty mass was obtained. 
(&) One part of the gum was allowed to stand over-night with 10 parts 
of water, after which it was warmed on a water bath and allowed 
to cool. The liquid was freed from solid matter by being squeezed 
through calico, and the filtrate was concentrated on a boding water 
bath, but no jelly was obtained. 
(c) One part of the gum was heated under pressure with 5 parts of water 
at 133°C for 1£ hour, but yielded only a thin non-homogeneous paste 
of a brown colour. 
From these experiments it appeared that this gum is much inferior to ordinary 
gum for use as a sizing material, but it was nevertheless submitted to one of the 
fnrJ!-+ ,t ^ Se +i fferenC i eS m 41 i resi ? conient of the gum are only due to the lack of uni 
foimity in the samples, as the solvents used were the same. [ Chem. Adviser .] 
[ 340 ] 
