176 THE INCREMENT. 



to the forester, but the data at present available give wide 



AGE, IN YEARS. 



Pig, 40, — Diagram illustrating the Relative Height Growth of Spruce, Silver Fir, 

 Eeech aud Scotch Pine on Localities of the First Quality. 



limits for those periods. The following table gives the average 

 ages at which the current annual and mean annual height 

 growth culminate : — 



On the whole, the culmination occurs earlier — 



(1.) In the case of light-demanding species, and 

 (2.) In the better localities. 



