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PLATE XXIV. 
Fig. 1.— Photomicrograph of a transverse section of 
yellow birch (Betula lutea)’ wood showing the final stage 
of the decay, X 15. 
Fig. 2.—- Photomicrograph of a transverse section of 
bitternut hickory (Hicoria minima) wood showing the final 
stage of the decay, X 15. 
