2 MANGROVE SWAMPS 
calorific determinations made by him on air-dried wood without 
bark. In this table the dried wood is taken as the basis on which 
to compute the percentages of moisture and ash. From the table 
TABLE XX.—Analyses and calorific determinations of air-dried wood 
without bark. 
[The numbers and common names are those given by Cox in the original table. The 
scientific names have been inserted by Mr. E. E. Schneider, wood expert of the Bureau 
of Forestry, after a recent examination of specimens of the wood used by Cox.] 










Heating Z 
| value of aval 
| | combus- eating 
aicancals Available tible mat- Mea of 
No. | Common and scientific names. Moisture. Ash. eerie heating |ter, wood Ablow 
value. ts sie ter, wood 
| ‘main cal-|_, (water 
| | : + ash). 
ories. 2 
Per cent. Per cent. Calories. Calories. 
.01 | ik f : A 
3 | Pototan (Bruguiera conjugata) - a qi ¥ : : a : ae : pe 
4 x {| di22 2.23 4,118 3, T72 4, 689 4,365 
Bacauan (Rhizophora mucro- i 11.37 9.99 Date aie £83 aoe 
ig). = - ; , 5 ; 
: Pa a Shes { 11.08 1.81} 4,159| 3,781| 4,699] 4,340 
aL) eee ee ! 
7 ; | 10.94 1.74)|_ See 
wail 75 7 p b b 
6 | Bacauan-tubig (Bruguiera sp.) 5: ‘ = 3,08 A868 @) (*) 
13.79 12 4, 142 BY 4, 787 5 
7 | Catutan (Bruguiera sp.) ------ x a i a : qe ie ee 
tt | 1.29 \eleecee_ |b | ee ee 
8 | Tabigue (Xylocarpus moluc- | 13.93 2.80 4, 005 3, 634 4,694 4,345 
Seay 
4 Ree as mane eat lf 13.77 2.05| 4,066| 3,764] 4,728| 4,456 
rugurerad sp.) ------ \ 
| 13.39 2.12 | 22-22 Abe | ee 
} H 
(pue2no9 Dake. 4, 162 3, 873 4,883 | 4,578 
10 | Tambu-tambu (Xylocarpus 1 12.99 97a | tak. ee ipa el tiie Lew 
moluccensis). | 14.27 2. 62 4,116 3, 841 4,831} 4,596 
11 | Pagatpat (Sonneratia caseo- | 14.27 2.65 
was | : | ys sual ss iowa peed aicc aoe cea a |) Cn eee a cotsere eee 
laris). if 10.71 2.41 4, 136 3,721 4,689 | 4,284 
14 | Bacauan (Rhizophora cande- | Si | 2.26 4.154 3.760 4.720 4.328 
laria). | : : ; 2 
4 {11.41 1.60 4, 292 3, 924 4, T47 4,399 
ijl het b 1 (Cer t 1A) oer Ss See 
Paes See eee [tee ieee | ee eres 4,293! 3,906| 4,747! 4,378 
5 | 12.26 | 1.55 4, 286 3, 895 4,840 4,46 
16 | Pototan (Bruguwiera conjugata) | | 4.297 8. 855 4778 4 Pe 
--------- ---------- > > > | > 
17 Lenggadi (Brugutera parvi- 11.97 1.65| 4,072] 93,716 |  4,629| 4,296 
flora). | 
| 

a2JIn the usual determination of the calorific value of a fuel in a calorimeter the 
products are cooled to the ordinary temperature and the result is therefore higher than 
can ever be realized in ideal practice, where the resulting gases always leave the flues at a 
temperature above 100°. Since the object of the determination of the calorific value of 
a fuel is to show its technical worth, I always have calculated the results on Philippine 
fuels on the assumption that the moisture present and the water formed during the com- 
bustion remain as steam at 100°, i. e., I have made a water correction by subtracting 6 calories 
for each per cent of water. Some mechanical engineers do not make this correction, and 
therefore obtain a result from 3 to 10 per cent too high, and in order that my results may be 
comparable in all cases I have decided to give also the uncorrected result under the caption 
“Main calories.” 
>On account of the very high ash content and the possibility of error in its determina- 
tion (ef. p. 10), this sample has little comparative value and I have therefore not included 
the heating value of the combustible matter in the average. The calculated results for the 
combustible matter wood — (water + ash), in main calories and available calories are 
4,482 and 4,123, respectively. 
