PERIOD OF FELLING, 



75 



The cubic contents here given are per Austrian 

 jock, which is 6173 square yards, or a little more 

 than an acre and a quarter. 



Now it is very evident from these tables that to 

 cut the oak before it reached a hundred years, or the 

 beech before it reached seventy years, would be to 

 lower the annual revenue of the forest below its capa- 

 bilities ; but on examining the pine, we find that 

 to cut it at fifty years would secure as high a yield 

 per annum as is attained at any subsequent stage, 

 and 25 per cent, more than is realised on a 120 



