122 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 
adoption of the above method, recommended generally, although 
cases may occur where it might not be practicable. 
Conclusion. 
To go fully into every subject bearing on the formation of 
plantations, would require more space and time than could be 
expended on an ordinary essay, and therefore many subjects and 
operations are only briefly described and treated upon; but as 
their general application has been kept more closely in view, than 
their particular adoption or execution in any one locality, no 
advantage would have been gained by going too closely into 
details. 
Some of the theories propounded in this essay are based upon 
observation rather than experience, and therefore difficulties may 
be in the way which might render their practical adoption 
impossible ; but as custom without reason has been defined as an 
ancient error, the risk of committing a modern error has been 
incurred, rather than the recommendation of any customary 
operation for which no logical reason could be given. 
