on Wood and Charcoal. 369 



ena that presented themselves ; and it is certainly a 

 curious fact, that charcoal, which has hitherto been con- 

 sidered as one of the most fixed substances known, can 

 unite itself to oxygen, and form with it carbonic acid 

 gas, at a temperature much below that at which it burns 

 visibly. 



[This paper is printed from Nicholson's Journal, XXXII. (1812), 

 pp. 100 105.] 



