PHILIPPINE FIREWOOD. 17 



Table IX. — Approximate fuel value of Philippine firewoods — Continued. 



Fuel value. 



Kind of wood. 



Specific 



gravity. 



Reference. 



Good {sp.gr.,0.60to 

 0.75). 



Guava {Psidium r/uajava Linn.) — 



0.734 

 0.673 

 0.610 



0.641 



This paper, p. 12. 

 Watt 61, p. 351. 

 Watt 61, p. 281. 



Wattl, p. 116. 



. do - . 



Camanchilis [Pithecololium dulce Benth.) 



Tinductinducan(.4e<7ieemscorntCHta(«m(Linn.) 

 Blanco) {Aegiceras majusGABitu.) 



Very good (sp. gr., 

 0.75 to 0.90). 



Agoho (Casuarina equisetifolia Forst.) 



do... 



Tabigue {Xylocarpus sp.) . 



0.857 



0.834 



to 

 0.882 



0.737 



( 0.722 

 to 

 0.802 



0. 628 



0.819 



0.845 



0.706 



0.891 



0.770 



0.882 



This paper, p. 12. 



Watt, 2, p. 231. 



This paper, p. 1?. 



Iwatt, 2, p. 141. 



This paper, p. 12. 

 This paper, p. 12. 

 This paper, p. 12. 

 Watt,« 6I1I, p. 276. 

 This paper, p. 12. 

 Watt, 1, p. 420. 

 Watt, 6iv, p. 250. 



Tabigue {Xylocarpus obovatus A. Juss.) 



Pagatpat {Sonneratia pagatpat Blanco) 



do - 



do 



do 



Lenggadi {Bruguiera parviflora W. & A.) 



Alabangbang {Bauhinia inalabarica Roxb.) .. 

 Molave ( Vitex pubescens V'ahl) 



Excellent (sp. gr., 

 0.90ormore). 



Pototan (Bruguiera gymnorrhiza Lam.) 



do 



0.756 

 0.939 

 0.866 

 0.983 

 0.877 

 0.994 

 1.037 

 1.130 

 0.901 

 0. 885 

 0.738 

 1.008 



This paper, p. 12. 

 This paper, p. 12. 

 Watt, 1, p. 541. 

 This paper, p. 12. 

 This paper, p. 12. 

 This paper, p. 12. 

 This paper, p. 12. 

 Watt, 61, p. 491. 

 This paper, p. 12. 

 This paper, p. 12. 

 Watt, 2, p. 261. 

 Watt."* 



.... do 



Bacauan {Ehizophora mucronata Lam.) 



...do 



. .do 



... do .. 



do 



Catutan (Br«j7uierasp.) 



Tangal {Ceriops tagal (Perr.) C. B. Rob.) 



Tangal (C. roxburgfiiana Am.) 



Tangal (C. tagal (Perr.) C. B. Rob.) . 





' See Sonneratia apetala. 



^ See Ceriops candolleana. 



In the Philippines, as in other countries, almost all kinds of wood are 

 used for fuel and charcoal. In the above table no attempt has been made 

 to include any except those which are quite commonly used as firewood. 



It may be said in general of woods otherwise equal, that those of low 

 specific gravity kindle easily, flash up quickly and the fire spreads rapidly, 

 while those of high specific gravity behave in the opposite way. Tliere are 

 other circumstances which can not accurately be anticipated by a chemical 

 or physical examination. Some classes of wood burn with a still flame, 

 others crackle, while still others easily deposit soot unless an abundant 

 supply of air is present. Some woods of very high specific gravity are so 

 crooked and inaccessible that they are often considered inferior to those 

 of lower specific gravity which grow straight and are more easily available. 



It is a familiar fact that many salts inclose small portions of water 

 in their tiny crystals and when the crystal is heated it decrepitates on 



101334 2 



