TRANSITION, ETC. 1 03 



were of uniform age, they would at maturity say 

 at a hundred years stand at fifty to the acre, but 

 which, having hitherto been worked on the system 

 of felling by selection, is now stocked with toler- 

 able uniformity in something like the following 

 proportion per acre throughout : 



Trees from 80-100 years, 10 



60- 80 20 



., 40- 60 40 



20-40 80 



20 160 



Now, if we divide the forest into say five blocks, 

 ABODE, and begin by laying up E for twenty years, 

 treating ABCD as before, we sacrifice one-fifth of 

 our income for that period (supposing, of course, 

 that the forest had been hitherto worked up to 

 its full capabilities). At its conclusion, E, having 

 been properly thinned of all its small stuff during 

 the period, will have been reduced to sixty or 

 eighty trees per acre, varying from sixty to 120 

 years old. Now lay BCD up, and occupying the 

 first five of the second twenty years in cutting out 

 the large timber from A, we next turn to E, cut 

 out the oldest trees in the next five years, the then 

 oldest in the following five, and clear off in the last 

 five of the period. 



In this manner we avoid felling any timber under 

 seventy-five years old ; and getting a proportion at 

 120 years, the yield of this second period of twenty 



