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Bul. 1262, U. S. Dept. of Agriculture. PLATE III, 
TIMBER TEST PIECES ILLUSTRATING THE METHODS oF STUDY. 
A, Culture blocks cut from test pieces Nos. 8D and 18D, showing the distribution of the rots 
in the central portions of two4 by 4 inch test pieces. The incipient stage of each rot is seen 
to extend into the center of each. B, Culture blocks cut from the center of 1-inch (lower), 
2-inch, and 4-inch (center and upper) test pieces from tree No. 18. C, Culture blocks showing 
the hollows where fragments have been removed with the chisel forceps. 
