12 



cox. 



given temperature was determined. Just before using, the weighed pieces of 

 wood were dipped into distilled water, rubbed with a cloth or the fingers to remove 

 the air bubbles, and placed iminediately into the specific gravity bottle which 

 was filled with water. The stopper was next inserted and the weight determined. 

 From these data the specific gravity can be accurately computed. My results 

 are as accurate as is possible to secure with small pieces as is shown by the 

 fact that no perceptible amount of air escaped from the sample in the time 

 required to complete the experiment. In order to make the data complete I have 

 determined the specific gravity and the water content simultaneously on similarily 

 prepared pieces as follows : 



Table VII. — Specific gravities of Philippine firewoods. 



No. 



Common name. 



Moisture. 



Ash. 



Specific 

 gravity. 



1 

 2 

 3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 

 19 



Agoho - „_ _- 



Per cent. 

 (') 



( 13. 46 

 I 13.19 

 f 13.58 

 I 13.51 

 ( "12.10 

 I 'J 11. 46 



Per cent. 

 f 0.62 

 1 0.61 

 1.39 

 1.31 

 1.46 

 1.44 

 2.29 

 2.23 

 1.81 

 1.74 

 5.75 

 5.57 

 1.29 

 1.28 

 2.80 



0. 8569 



Guava. _ 



0. 7712 

 0. 6973 

 0. 7671 

 0. 7441 

 "0.9861 

 •: 0.9801 



Pototan _- ._ 



Bacauan .__ _ 





Bacauan . _ 







t 12. 26 

 I 11.88 

 f 13.24 

 I 13. 03 

 f 13. 71 

 1 12. 73 

 f 13. 07 

 1 12. 77 

 f "IS. 00 

 I 'il2.,50 

 f 12.94 

 I 12. 83 

 f 11. 88 

 1 11.38 

 f 12. 85 

 I 12.84 

 ( 12. 78 

 I 12. 45 

 f 13. 25 

 I 13. 09 

 t 13. 24 

 I 12. 63 

 f 13. 37 

 '. 13.32 



{') 



0. 8799 

 0. 8732 

 0. 9136 

 0. 8868 

 0. 7412 

 0. 7333 

 0.996 

 0.991 

 0.5954 

 0. 5668 

 0. 6688 

 0. 5867 

 0. 5461 



Catutan . 



Tabigue 



Bacauan _ 



2.12 

 2.05 

 2.72 

 2.71 

 2.65 

 2.62 

 1.44 



Tambu tambu . 



Pagatpat 



Lumbayao 



Bayub ' 



1.46 



0,5062 

 0.4914 

 "1.071 

 '1.002 

 0.890 

 0.880 

 0. 9426 

 0.9336 

 0. 8936 

 0. 8881 

 0. 8186 

 0. 8447 



Bacauan . 



2.41 

 2.26 

 1.60 



Tangal 



Pototan __ 



1.55 



Lenggadi 



1.65 



Pagatpat.— 





Pagatpat 





Average of averages.. . 





12.81 













" Air-dry. 



•> Heartwood beginning to form. 



"= The heartwood sinks. 



* Sapwood. 



• Heavier than water. 

 ' Unseasoned. 



