REPORT ON FORESTS. 



135 



number of trees. Plot No. 54 is of about the same age as 

 Plot No. 52, but has only one-half as many trees. These two 

 plots were also very near together, the former on the edge of a 

 swamp. A number of stumps of nearly as large diameter as the 

 trees within the stand were counted and the age found to be the 

 same as in Plot No. 52. In Plot No. 54 there were over 1,000 

 more cubic feet and over 10,000 more board feet per acre, though 

 the number of trees was only about one-half as great. From 

 these figures it follows : First, that it requires about sixty years 

 to produce lumber in paying quantities ; second, that it would 

 pay to thin the forest when it is about forty to sixty, years old. 



Table 23. 



Summary of Sample Areas Surveyed in JoVs Swam-p, near 



Whitings, and Marigold Swampy near 



Tuckerton, New Jersey. 



