GROUND-WOOD PULP. 81 
‘gimilar materials. When ground to a finer state, however, it has 
been demonstrated that with a mixture of a small amount of chemical 
fiber bogus kraft paper can be produced which will serve for a cheap 
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Fig. 21.—Relation of strength of paper to power consumption per ton of pulp. 
& t 
200 
“wrapping paper. It is hardly likely that spruce could be used for 
the manufacture of cheap wrapping paper in this manner on account 
of its price, but other woods, which will be discussed later, also give 
