Bul. 36, Bureau of Plant Industry, U. S. Dept. of Agriculture. 
Fia 2.—SECTION SHOWING MORE ADVANCED STAGE 
OF DECAY. 
EARLY STAGES OF 
PLATE X. 
Fic. 3.—SECTION FROM TREE SHOWN IN 
Fic. 2, MADE 15 FEET HIGHER UP. 
“RED: ROT.” 
