AFFOEESTATION OF CATCHMENT AEEAS 93 



Height, Growth of Sample Trees in Older Woods, Lake Vyrnwy. 

 (sh. = sheltered ; exp. = exposed.) 



Height in Feet corresponding to Various Ages. 



Years of Age. 



Spruce. 



11 



g.| 



52 



77 



Timber Volume (Quarter Girth) of each Sample Tree over 

 Bark, Cubic Feet, 



14 12 



13 



Spruce. 



42 1 



10 



II 



16 



45 



These measurements show the great value of European 

 larch and spruce for the production of timber in the 

 mountains of Central Wales. Corsican pine does well at 

 high elevations ; and plantations of this species made in 

 1906-1907 at 1300 feet above sea-level showed an 

 average height of 10 feet in 1918, with leading shoots of 

 the current season about 1^ feet in length. The newer 



