PLATE 3 
A. —A white oak attacked by Monilia sitophila. Section stained with silver nitrate. 
The precipitate which is often troublesome with this stain is apparent here, yet the 
fungus is clearly differentiated. 
B. —This unidentified fungus, present in some brash Sitka spruce trom another 
investigation, is inserted because it illustrates the excellent differentiation, in the 
case of both wood and fungus, that was obtained with an overnight staining in a dilute 
solution of gold chlorid applied after a treatment of less than one hour with sodium 
acid sulphite. 
