ECONOMIC POSSIBILITIES OF MANGROVE SWAMPS. 



53 



Xylocarpus granatum Koen. Piagao (Tagalog). 



This tree often reaches 50 centimetei's in diameter, but it is not very 

 plentiful. Its bark is exceedingly thin, usually 2 to 3 millimeters; it is 

 dark on the exterior and bright red on the interior. A tree will not 

 yield more than 20 to 25 kilograms of bark. Its wood shows 6 to 8 

 per cent of tannin. The wood is very beautifully grained and colored, 

 and should be valuable for interior finishing. 



Table VI. — Analyses of bark of Xylocarpus granatum Koen. 



Sample No. 



Diam- 

 eter of 

 tree. 



Parts per 100 of water-free 

 material. 



Insol- 

 uble. 



Total 

 extract 



Non- 

 tannin. 



Tan- 

 nin. 



7 — . 



Cm. 

 20 

 45 



62.8 

 70.0 



37.2 

 30.0 



12.2 

 9.1 



25.0 

 20.9 



57. 





Average 



32.5 



66.4 



33.6 



10.6 



23.0 





Xylocarpus obovatus A. Juss. Tabique or Nigue (Tagalog). 



In some of the higher parts of the swamps this tree occurs quite 

 plentifully, attaining a diameter of 30 to 40 centimeters. Its bark, 

 like that of the preceding, is very thin. Its wood is somewhat lighter 

 in color and weight than X. granatum. The trees often are decayed at 

 the heart. 



Table VII. — Analyses of bark of Xylocarpus obovatus A. Juss. 



Sample No. 



Diam- 

 eter of 

 tree. 



Parts per 100 of water-free 

 material. 



Insol- 

 uble. 



Total 

 extract. 



Non- 

 tannin. 



Tan- 

 nin. 



78 



Cm. 

 25 

 20 



67.6 

 69.7 



32.4 



7.7 



24.7 

 21.7 



79.. 



30.3 



8.6 





Average 





22.5 



68.7 



31.3 



8.1 



23.2 







Sonneratia pagatpat Blanco. Pagatpat (Tagalog). 



These trees often grow in exposed places, and under such conditions 

 are stunted and gnarled. Under more favorable surroundings they some- 

 times exceed 1 meter in diameter. The bark is dry and woody, sometimes 

 containing only 15 to 20 per cent of moisture in old trees. The wood is 

 yellow-white but dark at the heart. It is moderately hard, suitable for 

 general structural work. 



