Jul). No. 21, Div. Veg. Phys. and Path., U. S. Dept Agr. 



Plate V, 



fc**^*^ 



'"^•-.m- 



-1 . . -^'^^ 



Upper figure shows radial view of block of cedar in early stages of decay; 



LOWER FIGURE SHOWS END VIEW OF SEVERAL POCKETS UNITING 



