Bui. 606, U. S. Dept. of Agriculture. 
Plate X. 
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Penetration in Larqetooth Aspen— Heartwood (Populus grandidentata). 
1, piece No. 45 treated 30 minutes; 2, piece No. 46 treated 60 minutes: 3, piece No. 47 treat ed 120 
minutes. Largetooth aspen showed very erratic penetration, which is well illustrated in the 
three specimens shown. 
