with the resin content. 



The available heat vrlue of a cord of wood depends on 

 many different factors* It has a relation not only to the 

 amount of resin it contains "bv/; to the amornt of incisturc pres- 

 ent. Furthermore, cords vary as to the amount of solid wood 

 they contain even when they are of standard dimensions and 

 occupy 128 cubic feet of space. A certain proportion of this 

 .pace is made up of air spaces "between the sticks, rnc! this 

 air space n&y be considerable in a cord made of twis ted, crooks 

 and knotty sticks. Out of the 128 cubic feet a. fair average 

 of solid rood is about 60 cubic feet. It is pointed out, hrw- 

 aver, that heat value is not the cnl.y test cf usefulness in 

 fuel wood, and since 95 per cent of all wood used for fuel is 

 consumed for comestic purposes , largely in farm houses, such 

 factors as rapidity of burning and ease of lighting are im- 

 ~ortant. Each section of the country has its favored woods and 

 these are said to be , in general, the right ones to use. Hickory 

 of the ncn-resinous woods, has the highest fuel value per unit 

 volume of iT vOod,and has other advantages. It burns evenly/ and, 

 ,:s housewives say, holds the heat. The oaks come next , follower. 

 by be ech, birch, and maple. Pine has a relatively low heat value 

 -er unit volume but has other advantages; it ignites readily 

 ,^nd gives out a ruick hot flame but nne that soon dies down. 

 ihi, makes it a favorite with rural rioiisek^epers as a summer 

 T "ood, because it is particularly adapted for hot days in the 

 kitchen. 



