26 
Indian Forest Records. 
[Vol. Ill 
Serial 
num¬ 
ber. 
Species and Locality. 
Mois¬ 
ture. 
Tan¬ 
nin. 
Tannin 
on dry 
mate¬ 
rial. 
by whom reported. 
Remarks. 
27 
Kandelia Rheedii 
(Sunderbuus, Bengal) 
Per 
cent. 
9-90 
Per 
cent. 
12 20 
Per 1 
cent. 
13-40 
Mr. D. Hooper. 
28 
Ditto 
ditto . 
, 
14-54 
... 
Dr. Leather. 
29 
Ditto 
ditto . 
204 
Mr. D. Hooper. 
30 
Do. from Mala¬ 
bar Coast (very 
thick, reddish and 
dense) . 
... 
27-4 
Ditto. 
Commenting on the analyses made at the Imperial Institute of 
London bv himself as given in the above table, Professor Dunstan says :— 
“ These results show that many of these barks are very rich in tannin, 
notably one specimen of Rhizophora mucronata , which contains over 27 
per cent., although the second specimen of the same bark contains only 
4 per cent. It is desirable that further samples, of known origin and 
age, of Rhizophora bark should be sent for examination so that the 
cause of the great discrepancy between the percentage of tannin in these 
two samples may be cleared up. 
The bark of Ceriops Roxhurghiana , of which only one sample was sub¬ 
mitted, is also rich in tannin, containing 23*5 per cent. Considerable 
variation is shown in the percentage yielded by the three specimens of 
Ceriops Candolleana , namely, 13, 17 and 21. The lowest percentages of 
tannin are furnished by the two barks of Bruguiera 1 gymnorhiza and 
Kandelia Rheedii , namely, 12*7 and 11*9, but here only one sample of 
these barks was sent. ********* 
********** ** 
It is evident from the results recorded above that there is consider¬ 
able variation in composition in different samples of one and the same 
bark, which points to the desirability of collecting these barks systematic¬ 
ally at different stages of growth so that it may be ascertained by 
chemical analysis when the tanning value reaches its maximum. 2 
1 Also termed Rhizophora. 
2 Technical Reports and Scientific Papers,. Imperial Institute, 1903. 
243 
