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



PLATE XV. 



4 , . . 



FIG. 1. ONE-THIRD SPRUCE, TWO-THIRDS HEMLOCK. (COMMERCIAL RUN No. 46A.) 



FIG. 2. ONE-THIRD HEMLOCK, ONE-THIRD JACK PINE, ONE-THIRD SPRUCE. (COMMERCIAL 



RUN No. 51.) 



FIG. 3. ONE-THIRD JACK PINE, TWO-THIRDS HEMLOCK. (COMMERCIAL RUN No. 52.) 



MIXED GROUND-WOOD PULPS USED IN ACCOMPANYING PAPER 



SAMPLES. 



