95 



are more frequently to be attributed to 

 the concurrence of the favourable con- 

 ditions above stated than to the peculiar 

 attributes of the trees themselves. Such 

 trees, v^hen imported, and planted on the 

 poor soils and exposed situations which 

 are alone planted in cultivated countries, 

 make poor progress, and never reach any 

 size. 



I have received the following marvel- 

 lous measurements of some pinus 1am- 

 bertianas on the Columbia, from an autho- 

 rity that I cannot doubt. At eight feet 

 from the ground they were fifteen feet in 

 diameter. The stems were branchless 

 to two hundred and fifty feet from the 

 ground, and were there thirteen feet in 

 diameter. If the new annual ring of wood 

 was a quarter of an inch wide trees would 

 attain this diameter in three hundred 

 and sixty years ; and supposing them to 

 have grown a foot a year in height, 

 this would allow them eighty feet of head 



