152 FARM FORESTRY 



amount of heat given off in burning. In general the heavier 

 the wood the more heat it will give out. 



Other Products. — There are many other products furnished 

 by farm woodlots most of them however, supplying only a 

 local demand. More can often be made by supplying these 

 special markets than from the ordinary products. In the 

 vicinity of pulp mills soft wood like spruce, poplar, aspen, 

 hemlock and pine are usually in demand. Acid factories and 

 distillation plants require large quantities of wood like beech, 

 birch and maple. Wood is in demand in many regions for 

 wagon stock, tight and slack cooperage, and for making furni- 

 ture and chairs. The bark of trees especially of hemlock and 

 chestnut oak is in demand for tanning leather. Sometimes 

 more can be made out of the bark of a tree than out of the 

 wood. 



