204 



Thus two trees having diameters of 1.25 and 15 cm. and heights of 

 I and 7 m. respectively were each found to be 25 years old. 

 Similarly in the case of two specimens each of which measured 

 77 cm. in diameter at the age of 250 years, the diameters at 50 



Fig. 2. Interior view of Colebrook forest. Hemlock and beech, 

 composed of laurel and hobble bush. 



Underbrush 



years were 3.1 and 22.5 cm. respectively. This disparity is of 

 course to be correlated with environmental conditions, especially 

 with the degree of shade or exposure to which the young trees 



