Preservation of Wood. 267 
Preservation of Wood.—It has long been known that wood may 
be Preserved by carbonizing its surface, and in the country this method 
§ generally adopted when piles or posts are planted in the earth, because 
that wood thus treated very completely resists the action of bot 
and water. At the commencement of the present century, Berthollet 
ment vessels is commenced. : 
The process of Mr. de Lapparent, consists in directing, against the 
rs 
y been laid down, and we shall soon Jearn the results. Finally, 
