Bui. 1298, U. S. Dept. of Agriculture 
Plate IX 
Fig. 1.— Fresh sound spruce used for experimental grinding in comparison with the infected 
wood shown in fig. 2 
Fig. 2.— Rick of infected spruce wood used for experimental grinding. This was representative 
of the material toward the base of the pile shown in PI. VI, fig. 3 
Fig. 3. — Specific gravity disks cut from the infected spruce shown in fig. 2. Sample 23 was 
decayed by Lenzites sepinria and Polystictus abietinus] sample i-'l by Stereum sanguinolentum, 
and sample 19 by a fungus which was not fruiting and hence indeterminable 
Fig. 4. — Spruce wood about four years old sent to the laboratory for sulphite and soda cooking 
tests. This wood was rotted mainly by Fomes roseus and was too far gone for commercial 
use 
