Bul. 343, U. S. Dept. of Agriculture. 
F—LAB. 6 
Wale 
Fig. 1.—SPRUCE MECHANICAL PULP (RUN No 
ae 
< e 
oe nN) 
0; \\ 
—LAB. 7 
F 
275). 
—SPRUCE MECHANICAL PULP (RUN No 
Fia. 2. 
