BLACK WALNUT: ITS GROWTH AND MANAGEMENT. 
15 
the supply during that period, although the situation may be some- 
what ameliorated by the careful management and conservation of re- 
maining stands. At the end of this period the remaining supply will 
begin to decrease unless active steps are now taken to secure an ade- 
quate replacement by extensive planting or by forest management to 
secure natural regeneration. The upper Ohio Valley and Appalach- 
ian region is too limited to maintain a very large output. There is 
absolutely no need, however, of our sacrificing a national asset like 
black'walnut, which may be perpetuated if the proper action is taken. 
60 ft 
Pig. 2. — Open-grown black walnut tree. 
DESCRIPTION OF THE TREE. 
SIZE AND FORM. 
Black walnut is naturally a large tree, and, if it were given time 
and a favorable site, it would grow to magnificent proportions. At 
present, however, it is a rare* thing to see trees over 30 inches in diam- 
eter, breast high, and these are usually open grown with broad- 
spreading crowns and short trunks. Logs as large as 77 inches at the 
