Bui. 606, U. S. Dept. of Agriculture. 
Plate VIII, 
Penetration in Hickory Heartwood (Hicoria alba). 
1, piece No. 60 treated 30 minutes; 2, piece No. 70 treated 60 minutes; 3, piece No. 71 treated 120 
minutes. Note the uniform penetration in wood even at a considerable distance from the part 
where creosote was applied. 
