252 HEAT. 



violent draught produced from dry materials. Where 

 the draught can be perfectly regulated, however, seas- 

 oned wood should be always used, both for convenience 

 and comfort, and for economy. 



Where wood is to be drawn to a distance, the pre- 

 ceding estimate shows that the conveyance of more 

 than half a ton of water is avoided in every cord by 

 seasoning. 



