262 
Indian Forest Rec(H‘ds. 
APPENDIX B. 
Note on the analysis of six samples of Burma Cuich hy Mr. Pun an 
Singh, Acting Imperial Forest Chemist, Dehra Bun, 9lh September 
1907. 
I BEG to submit herewith the chemical analysis of 6 samples of 
Burma Cutch sent by you to my office. 
It will be seen from the table given below that some of them are 
very moist ; 11 — 13 per cent. I think should be the limit of total mois- 
ture in a good sample of cutch. No. 2 and No. 3 exceed this limit by 5 
and 8 per cent., while No. 4 and No. 6 by as much as 21 — 25 per cent. 
The sample of cutch I extracted from Acacia wood in my laboratory 
shows an average of 12'965 per cent, of moistm’e. 
Argued from the percentage of ash residue the sample No. 2 is veiy 
impure. The normal limit of ash is given at 5 per cent., and the per- 
centage of ash in sample No. 2 exceeds this limit by 10 and the samples 
No. 3 and No. 4 by 2 per cent. 
The catechin value of these samples is generally good excepting that of 
No. 2, which comes only to 5'2 per cent. The method adopted for the 
determination of catechin is one of my own and the relative merits of 
this process and that already known by acetic ether extraction, I am to 
discuss in a separate pamphlet on the subject. 
But I may note here in passing that the catechin value found by me 
is higher than that found generally by the acetic ether process, as in the 
latter the complete isolation and extraction of catechin does not take place 
as believed, for pure catechin goes with ether rather reluctantly while 
in the menstruem used by me it dissolves with extreme ease. 
The tannin value of these samples is also fairly good, excepting that 
of the second sample, which is only 2T2 per cent. The percentage of 
insoluble organic matter is within its limit in all these samples excepting 
that of the second, which runs up to 25 per cent. 
On the whole I find that excepting samples No. 2 and No. 6 all the 
samples are good. No. 2 is very deficient in tannin value, while No. 6 
is very moist and its tannin value is, comparatively, very low. 
