﻿Bui. 1128, U. S. Dept. of Agriculture. 



Plate I. 



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Fig. 1.— Section from a Rib Web, Showing Blue-Stain in Sugar Pine. 



The dark-blue specks are the ends of the medullary rays. The pale orange colored wood 

 at the right is unstained heartwood. 



Fig. 2.— Section from a White-Ash Longeron. 



The brownish discoloration with the small white streaks indicates incipient white 



heartwood rot. a.hoens.co.balto. 



