56 



TABLE No. 28. Yield from Thinnings. 



Trees under 5 inches, from report of the New Hampshire Forestry Commission 

 1906. 



GROWTH. 



The two following tables represent the average growth of 

 white pine in volume and height as found in different loca- 

 tions or sites. Volume growth is expressed in solid cubic 

 feet, because it is the best unit for scientific measurement. 

 The material for growth study is obtained from a series of 

 measurements called a "stem analysis." The trees are felled 

 and sawed into sections which are subject to the following 

 measurements. The diameter on the stump and its height 

 are taken, also the diameters at the large and small end of 

 each log and its length, and the diameter at the base of the 

 top and its length. All these diameters are taken inside the 

 bark. The stump is cubed as a cylinder, each log as the 



