4o8 



FORESTRY AND IRRIGATION. 



October, 



Satisfactory reproduction starts again 

 and again, but is always destroyed b}' 

 fire. Recent lumbering has left no seed 

 trees at all (Fig. 4). 



For purposes of comparison and to 

 show what growth has been possible 

 under partial protection from fire, meas- 

 urements were made in some of the few 

 scattered bunches of second-growth pine 

 which have been accidentally sheltered 

 from destructive fires. On seventeen 

 acres of second growth, on moist, loamy 

 sand, the average stand per acre one 

 inch and over in diameter was 349 trees 



(Fig. 5). White Pine, 29 per cent, av^er- 

 age diameter, 7.4 inches; Norway Pine, 

 28 percent, average diameter, 7.4inches. 

 Other trees were Red Maple, Beech, 

 White Oak, Scarlet Oak, Birch, Hem- 

 lock, Jack Pine, and Aspen. There 

 were 652 White Pines per acre under 

 one inch and 117 Norway Pines. The 

 total merchantable scale per acre, of 

 pine five inches and over in diameter, 

 was 31.6 cords; the average age was 70 

 years. The stumpage value would be 

 about $74 per acre if the timber oc- 

 curred in quantit^^ 



FIG. 3. SHOWING DESTRUCTION OF JACK PINE BY FIRE. 



