Bui. 606, U. S. Dept. of Agriculture. 



Plate V 



Penetration in White Ash— Heartwood (Fraxinus lanceolata). 



1, piece No. 66 treated 30 minutes; 2, piece No. 67 treated 60 minutes; 3, piece No. 68 treated 120 

 minutes. The thin-walled tyloses allowed the creosote to penetrate the vessels to some extent 

 in addition to the penetration obtained in the wood prosenchyma. Spots on the untreated 

 areas are points to which the creosote penetrated through the vessels. 



