THE ANNUAL FALL. 127 



decennial sub-periods, I 1 , and I 2 ., and particular attention is 

 given to the distribution of the falls during sub-period 7 1 ., 

 towards the end of which a revision should take place for 

 fixing the falls of the next 10 years; and so on continuously 

 thereafter. The average fall for the I. period having been fixed, 

 and the period subdivided into the two decennial sub-periods, a 

 detailed examination of the cubic contents and the present rate 

 of growth of the crops in each of these sub-periods is made, and 

 the yield is then calculated (including the accruing increment) to 

 the middle of each sub-period, and entered into the Felling-plan. 

 The total fall for each of these decennial sub-periods being then 

 divided by 10, gives the average annual fall in cubic feet per 

 annum for each of the first 10 years, and also from the llth to 

 [the 20th year. On the Continent, the exact locality in which 

 each separate year's fall is to be made is not prescribed, it being 

 left to the discretion of the head forester to fell where he may 

 consider most expedient. 



The falls for the II. period, 20 to 40 years hence, are also 

 entered in the plan as regards acreage and yield, the yield being 

 only roughly estimated, while for the subsequent periods only 

 the area is entered, as it is still too early to estimate what the 

 future yield will be of woods only maturing 60 to 100 years 

 hence ; nor would there be any practical use in doing so. 

 Under this method, Beech and other broad-leaved woods in 

 general are worked usually with a rotation of 1 20 years, divided 

 into 6 periods, and Conifers with a rotation of 100 years 

 divided into 5 periods; and every 10 years a revision takes 

 place to fix the details for the fellings during the next 10 years. 

 So far as fixing the falls for the subsequent 4 or 5 periods is 

 concerned, the method is purely by area, but giving due con- 

 sideration to soil-productivity. 



The form in which such a felling-plan could be drawn up for 

 Conifer high woods worked with an 80-years rotation might be 

 somewhat as follows : <J 



