Bui. 1298, U. S. Dept. of Agriculture 
Plate XIX 
Fig. l— Nine-months-old pure culture of pulp infected with a wood-destroying fungus, culture 
No. 82219-15, sample No. 25 
Fig'. 3.— Piece of pulp, similar to fig. 2 originally, after infection for six months with culture 
Fig.°4.— Block of white spruce wood completely rotted in six months by same fungus 
