8 cox. 



Table IV. — Analyses and calorific determinations of air-dried hark.^ 



No. 



Common name. 



Moisture. 



Ash. 



Main 

 calories.'' 



Available 

 heating 

 value. 



Heating 

 value of 

 combus- 

 tible 

 matter, 

 wood — 

 (water 

 + ash) 

 in main 

 calories. '' 



Available 

 heating 

 value of 

 combus- 

 tible 

 matter, 

 wood — 

 (water 

 -t-ash). 



2 

 3 

 4 



6 



7 

 8 

 

 10 



Guava. 



Per cent. 

 12. 41 

 13.90 

 10.23 



f 15. 67 



Per cent. 



11.30 



6.72 



10.37 



8.19 



3, 522 

 3,983 

 3,971 

 4,054 

 4,034 

 4,037 

 3,848 

 3,891 

 3,841 



Calories. 

 3,199 

 3,668 

 3,664 

 3,708 

 3,692 

 3,710 

 3,488 

 3,565 

 3,536 



4,475 

 4,863 

 4,884 

 5,124 

 5,099 

 4,920 

 4,857 

 4,903 

 4,853 



Calories. 

 4,153 

 4,568 

 4,575 

 4,791 

 4,771 

 4,624 

 4,510 

 4,594 

 4,571 



Pototan 



Bacauan - - 



do-. - - 



Catutan 



16.27 

 16.21 

 15.70 

 15.74 



4.60 

 7.93 

 8.17 

 8.39 



Tabigue 



Tambu tambu .. 



Average of averages 



14.52 









4,858 



4,547 









' One might surmise that the external configuration of the bark would have an 

 influence on the extraneous matter, 

 i" See footnote "a" of Table III. 



Table III shows that the average of the calorific values of the com- 

 bustible matter of all the woods analyzed are practically the same. The 

 same uniformity is shown in the ultimate composition of different woods. 



Table V. — Ultimate composition of different dry woods. 



Kind of wood. 



Carbon. 



Hydro- 

 gen. 



Oxygen. 



Nitrogen. 



Ash. 



Available 

 calories. 



Main 

 calories. 



From F. Fischer.^^ 

 Oak 



Per cent. 

 49.84 

 50.05 

 48.45 

 49.20 

 48.55 



49 89 

 50.64 

 .50.61 

 50.31 

 51.75 



Per cent. 

 5.83 

 6.04 

 5.95 

 5.91 

 5.85 



6.07 

 6.03 

 6.23 

 6.32 

 6.19 



Per cent. 

 43. 

 43.21 



45.26 

 43.10 

 45.04 



43.11 

 42.05 

 42.04 

 42.39 

 41.08 



Per cent. 

 94 



Per ct. 

 0.39 

 0.70 

 0.34 

 0.79 

 0.56 



(') 



4,421 



4,740 

 4,892 

 4,805 

 4,798 

 4,802 



Spruce _ 



Birch 







Acacia 







Beech 







From Chevandier.'^* 

 Red beech 



0.93 

 1.28 

 1.12 

 0.98 

 0.98 





Oak 







Birch 







Aspen 







Willow 









» Calculated free from ash. 



"Ztschr.f. angew. Chem. (1893), 6, 578, and (1899), 12, 334; J. (1900), 45, 5. 

 "Nordlinger, Technisehe Eigenschaften der Holzer, Stuttgart (1860), 415. 



