is 
Indian Forest Records. 
[VOL. III. 
Analysis of fresh Mangrove bark from Andamans— contd. 
Serial 
num¬ 
ber. 
Description. 
Mois¬ 
ture 
on 
fresh 
bark. 
Mois¬ 
ture 
on 
air- 
dried 
bark. 
Ash. 
Total 
solu¬ 
ble 
solids. 
Non¬ 
tannin. 
Tan¬ 
nin. 
Colour 
measure- i 
ment on -5 
solution 
in 1 cm. 1 
cell. 
The yield 
of extract 
calculat¬ 
ed on air- 
dried 
material, 
with 20 
per cent, 
moisture 
from 100 
parts of 
the bark. 
5 
Rhizophora con- 
jugata bark 
(from young 
trees) 
Per 
cent. 
41-2 
Per 
cent. 
8-34 
Per 
cent. i 
11-14 
Per 
cent. 
40-00 
Per I 
cent. 
12-26 
Per 
cent, 
27-74 
Red. Yellow. 
9 16 
6000 
6 
Bruguiera gym- 
norTiizct bark 
(from old trees) 
45-73 
9-24 
1 
7-13 
! 45-48 
8-2 
! 37-28 
9 
22 
65-48 
7 
Bruguiera gym- 
norhiza bark 
(from young 
trees) 
47-32 
8-35 
15-09 
40-72 
1009 
30-63 
8 
22 
60-72 
8 
Ceriops Candol¬ 
leana bark 
(from old trees) 
38-61 
8-2 
5-6 
45-56 
12-16 
33-40 
12 
42 
65-56 
9 
Ceriops Candol¬ 
leana bark 
(from young 
trees) 
40-14 
7-95 
9-19 
33-80 
8-31 
25-49 
15 
50 
53-80 
It will be seen from the above table, that once the bark is air-dried, 
its moisture content becomes almost constant. The fresh bark received 
from Andamans had 38 to 48 per cent, of moisture, while the same, air- 
dried, gave 7 to 9 per cent., and the bark stored for two years in the 
laboratory gave 10—11 per cent, of moisture, losing only 1 per cent, when 
its coarse powder was air-dried. The ash in the above samples ranges 
between 5 and 17 per cent. The young bark of all species shows more 
ash than the old, in some cases almost double. Of these species Uhizo- 
phora mucronata and Ceriops Candolleana show the lowest percentage of 
ash, while Rhizophora conjugata gives the highest. 
245 
