128 



THE MANAGEMENT OF WOODLANDS. 



As should be noted, particular attention is paid to the falls in 

 Period I., less to those in Period 1 1., and little at all to Periods 

 III. and IV., at present. The aim is to try and attain a normal 

 condition i.e., equal areas for felling in each period (age-class), 

 and equal annual or at least periodic falls. In Period L, the 

 sub-period I 1 , includes all crops which should normally be felled 

 in this period as being 80 years old or more, together with any 

 which may be brought in from sub-pefiod I 2 , in order to equalise 

 the two sub-periodic falls ; and it might even be the case that 

 less than the total acreage mature would be felled. The cubic 

 contents and the current increment per acre in 1910 are noted, 

 and in estimating- .tlieiyteld per acre throughout the 10. years of 

 sub-period I 1 , there must be added to the original growing-stock 

 ascertained in ,19 10, 5 times the current annual increment, so as 

 to give the mean for the ten years in the sub-period ; and the 

 total yield is of course found by multiplying this result by the 

 number .of acres in the crop. And the same method is applied 

 to sub-period I 2 ., the object being to estimate the normal 



