I20 GEOIvOGICAI. SURVEY OF NEW JERSEY. 



The average age of the crop is 35 to 40 years ; the average 

 height, 24 feet ; the average diameter, 3.7 inches. It is fair to ask 

 why the growth is slow. The soil, it is true, is a dry sand, but 

 similar soil has been observed to bear very much more rapidly 

 growing trees. Fire has never touched the trees and there is a 

 deep humus. The ' reason has already been given. The trees 

 are twisted and crooked, and often with from two to five stems 

 apparently from the same root, and the forest is composed of 

 Pine sprouts. The yield of this area is estimated to be thirteen 

 cords per acre. 



Not far from this plot a small area was studied where the 

 wood had been cut and stacked. The trees were not nearly so 

 numerous, and fire had apparently run over the area at some 

 time, though not of late. The stumps were measured on 0.3 of 

 an acre. 



Table 11. 



Diameter on stump. No. of trees. 



2 Inches 27 



3 " 50 



4 , " 47 



5 " 17 



6 " 17 



7 " 9 



8" I 



168 



The stacked wood measured slightly over two cords, or about 

 seven cords per acre. Six stumps were studied, and the age was 

 found to be thirty-five to forty years on the stump. 



The growth of an average stump was 0.6 inches in diameter 

 in the last ten years, or at the rate of one inch in about seven- 

 teen years. 



Second Growth After Fire. 



The samplfe acres given above show what the original forest 

 probably produced and what the second growth yields, whether 

 of seedlings or sprouts, where the land has not been very severely 

 burned. It remains to show the condition of land which has 

 been repeatedly burned, and to trace the various stages of dete- 



