I'in. I.. Dirtirt lUituchrt'im C"h.i npn ■lurtion ,,i a staiiuil spcciinoii of 

 Siiiiihcm Yellow Pine showing sap-stain Inngus niycclinni. Magnification 100 X. 



This particular fungus is harmful to the extent that it causes a discoloration 

 of the sapwood, which assumes a blue color in place of the usual straw-yellow. 

 \\'cK)d-destroying fungi differ somewhat in their appearance from the one 

 illustrated. 



S^^^ 



Fig. M. Direct colr.r pliotuniicr'^Kfaphy Ij ihc autochromc process of a 

 radial sectif>n of mahogany wood. Magnification 50 X. Mahogany is one of 

 the best of cabinet woods and finds wide application in the telephone plant. 



