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



PLATE IV. 



FIG. 1. SPRUCE SULPHITE STANDARD. 



m 



ft aft A V! 1 ' K'*Wm*< 



Y m * . - 1-- 



?S 









'v 



, . . T.-vsfy p|p^-x 



;:'*>' V:. -'/^. 



V 



- V A- 



FIG. 2. SPRUCE GROUND WOOD, No. 1 STANDARD. 



