Bui. 101, U. S. Dept. of Agriculture. 



Plate VI. 



Fig. 1 .—Penetrations in Eastern Hemlock (Tsuga canadensis) Heartwood. 



1, piece No. 256, treated 30 minutes; 2, piece No. 265, treated 60 minutes; 3, piece No 259, 



treated 120 minutes. 



Fig. 2.— Penetrations in Eastern Hemlock (Tsuga canadensis) Sapwood. 



1, piece No. 251, treated 30 minutes; 2, piece No. 254, treated 60 minutes. Eastern hemlock 

 is a good example of an easily treated wood that contains no resin ducts. The resin 

 cells had little effect on the penetration. Note the similarity of the treatment in the 

 sapwood and heartwood. 



