KERRY WOODS. 



29 



5. Thuya gigantea, Chamaecyparis Laivsoniana, Cupressus 

 macrocarpa Pinus ponderosa, Picea sitchensis, and other exotics. 

 These ha been planted singly or in small groups here and there 

 on the low ground. They are very interesting as showing the 

 rates of g* vth of the various species, but, from the way they 

 have been rown, are not of sufficient economic interest for 

 detailed de ription here. 



E. The R< itive Rates of Height Growth of the Different Species. 



On p. 30 ome of the height-growth curves have been collected 

 together it; >rder to illustrate the relative rates of growth of the 

 various sp4 es dealt with at different elevations. 



:\ ; show that of the three chief species larch, spruce, 

 and Scotch )ine the first named starts away fastest under good 

 conditions,j nd maintains its lead until at least the 4Oth year, when 

 the spruce ;gins to overtake it. Under poor conditions, however 

 (e.g., tree L, 1,460 feet elevation), the larch is very slow in 

 starting. -obably the Scotch pine grows best in early youth in 

 such circui .tances, though the curves do not fully indicate this, 

 owing to t fact that only two sample trees were felled. It is in 

 its subseqi at development, after the canopy has been formed, 

 that this s cies is so disappointing. The spruce is in all cases a 

 slow starte but makes up for this by its steady growth afterwards. 

 From this appears that an attempt to estimate the value of the 

 locality fo spruce from existing woods is likely to prove useless 

 unless the ; Dods are at least 30-40 years old. It is in this connec- 

 tion that ; graphic representation of the height-growth is most 

 useful. 



In the fc Dwing table the rates of growth are arranged according 

 to elevatic and an attempt is made to predict, from the height- 

 growth cu e, the probable height at 60 years. 



