TRANSITION, ETC. 1 09 



but if it is intended to work by rotation of annual 

 blocks with artificial reproduction, the blocks may 

 be each divided into twentieths, classed according 

 to the age of the preponderating trees of each 

 subdivision, and felled as they are classed; but 

 if it were intended to trust to natural reproduction, 

 the division into annual blocks would scarcely 

 result in concentrating operations more than the 

 modified system of Pldnterbetrieb indicated in the 

 last example that is, a Pldnterbetrieb in which 

 the trees of each block vary only twenty years in 

 age. The choice between these rival systems 

 would depend generally on the rate of growth of 

 the young crop. With timber like sissoo, the 

 seedlings of which in favourable conditions reach 

 a height of from two to five feet the first year, the 

 rotation of area would have the preference, as the 

 block opened for light the first year might be 

 cleared off the second, and operations be always 

 concentrated on two blocks ; but with slower grow- 

 ing seedlings, in which it is necessary to thin out 

 slowly, and at intervals of three or four years, 

 operations would be spread over nearly the same 

 area on the one system as on the other. Taking 

 block by block, it is perhaps easier to count stock 

 and maintain uniformity of yield. Taking the 

 whole area en masse admits of the selection of the 



