110 



THE MANAGEMENT OF WOODLANDS. 



rather than with a high rotation. But besides reducing the 

 area and the amount of the annual fall, a long rotation also 

 adds considerably to the total amount of capital invested in and 

 represented by the whole series of growing wood-crops ; and the 

 only advantage to be gained is that, with a high rotation, 

 timber is obtainable of larger dimensions and worth more per 

 cubic foot, and the thinnings in the maturing woods are also 

 likely to be larger and more valuable 



The formula, Normal Wood Capital = Annual Fall x No. of 

 years in Rotation + 2, assumes that each unit of area in the series 



Fig. 26. 



ACEO 10 20 30 



i 

 40 



. * .6' d I 



50 60 70 



1 

 80 YEARS 



of annual falls is stocked with a crop equal in amount to its 

 age (number of years) multiplied by the average annual rate of 

 growth of the mature fall of timber ; but this is not in reality 

 the case, as the rate of growth varies considerably according to 

 the age of the crop, being most vigorous during the polewood 

 stage of growth, although this variation does not affect the 

 total volume of the mature crop when harvested at the most 

 profitable age. 



, In .Fig. 26, for example, it will be seen that, presuming the actual 

 rate of growth of Pine woods on medium land is as shown by the curved 

 line, a rotation of 55 years would need only a somewhat smaller normal 



