PLATE IX. 
Bul. 343, U. S. Dept. of Agriculture. 
F—LAB. 20 
Fia. 1.—RED FIR MECHANICAL PULP UNSTEAMED (RUN No. 4) 
F—LAB. 21 
FiG. 2.—WESTERN LARCH MECHANICAL PULP UNSTEAMED (RUN No. 2). 
