C 95 ] 



100 parts of Norway Pine 19,2 of charcoal 



Sallow - - 18,4 



Ash 17,9 



. Birch 17,4 



Scottish Fir 1 6,4 



M. Gay Lussac and Thenard have concluded 

 from their experiments on the wood of the oak and 

 the beech, that 100 parts of the first contain : 



of Carbon - 52,53 



Oxygene 41,78 



Hydrogene 5,69 

 and 1OO parts of the second : 



of Carbon - - 51,45 



Oxygene 42,73 

 - Hydrogene - 5,82 

 Supposing woody fibre to be a definite compound, 



these estimations lead to the conclusion, that it con- 

 sists of 5 proportions of carbon, 3 of oxygene, and 

 6 of hydrogene ; or 57 carbon, 45 oxygene, and 6 

 hydrogene. 



It will be unnecessary to speak of the applications 

 of woody fibre. The different uses of the woods, 

 cotton, linen, the barks of trees, are sufficiently 

 known. Woody fibre appears to be an indigestible 

 substance. 



18. The acids found in the vegetable kingdom 

 are numerous ; the true vegetable acids which exist 

 ready formed in the juices or organs of plants, are 

 the oxalic, citric, tartaric, benzole, acetic, malic, gallic, 

 and prussic acid. 



