Forest Service, U. S. Dept. of Agriculture Mechanical Pulp. 



PLATE VI. 



FIG. 1. SPRUCE GROUND WOOD, No. 4 STANDARD, MEDIUM GROUND. 





, - 









:l^ 3 - :'-.. / _..;]& 





, 



y 



, W/ : 



*-. 



i 



x 



" ' ^ 



FIG. 2. SPRUCE GROUND WOOD, No. 5 STANDARD, FINE GROUND. 



