188 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



50 cubic feet of timber. Their average spread of branches 

 covers an area of 32 square yards, which gives one hundred and 

 fifty trees, yielding 7500 cubic feet, to the acre. This represents 

 an extremely rapid growth, which is detrimental to the quality 

 of the timber : in this respect the home-grown produce will not 

 bear comparison to the slowly-developed timber imported from 

 America. 



The experience gained in the growing of Douglas fir on this 

 estate, proves that the cultivation of this tree deserves every 

 encouragement. 



