Bui. 523, U. S. Dept. of Agriculture. 



Plate VIII. 



Fio. 1. — Black ash, 220 years old, from northern Fig. 2. — Green ash, 90 years old, the 



Michigan. Nearly all heartwood. Tree 24 same size as the black ash in figure 



inches in diameter breasthigh. 1. From southeastern Missouri. 



Mostly sapwood. Much stronger 

 than the black ash. 



Disks Showing Maximum Rate of Growth of Black and Green Ash, and Propor- 

 tion OF Heartwood and Sapwood. 



