202 THE ROTATION. 



RhilJings. 



3,558+5 + 44+87+118+13-4+144+ 



on 149-60-90x3 .o 



90 years = ^ = 43 



4,273 + 5 + 44+87 + 118+134+144+ 



,^^ 149+165-60-100x3 .« 



100 years = ' — — = 48 



5,017 + 5+44+87 + 118+134+144+ 



,,^ 149+165+167-60-110x3 -., 



110 years = -^ ^Jo ^ 



5,792+5+44+87 + 118+134 + 144 + 



,^^ 149+165+167+135-60-120x3 _ ^. 

 120 years = ^ -^ ^ — - 54 



6,591 + 5+44+87 + 118 + 134 + 144 + 



149+165 + 167 + 135 + 133-60- 



lon 130x3 K7 



130 years = ^^ = 57 



7,410+5+44+87 + 118+134 + 144 + 



149 + 165+167+135 + 133+135- 



-, ,^ 60-140x3 ^n 



140 years = -— = 60 



It will be observed, that the annual income still rises under 

 a rotation of 120 years, and will continue to do so, until the 

 volume- and quality increment become so much reduced, that 

 they will cause a reduction in the average income. At the 

 same time, a rotation of 120 years would involve a financial 

 loss, because interest on the invested capital has been alto- 

 gether omitted. This can easily be seen by a reference to 

 cohnnn /,• of the financial yield table at page 196. The net 

 soil rental under a rotation of 120 years comes to 7'41 shillings, 

 and under one of 80 years to 10*10 shillings. This is due to 

 the fact, that the income under a rotation of 120 years repre- 

 sents the interest on a much larger capital invested in the 

 forest, than is the case under a rotation of 80 years. 



