NEW BRUNSWICK FORESTRY CONVENTION 10T 



YIELD TABLE B 



From these tables it is possible to determine by simple inspection, what 

 period of time is required before a forest may be cut a second time with 

 equal profit. From such data as these it appears that the most immediate 

 results are to be obtained by cutting the forest down to a dimension of five 

 inches in diameter. But such an operation would be eminently unwise, 

 as it would require from 50 to 75 years for the trees to regain their original' 

 dimensions, while the extreme diminution of the seed-bearing trees would* 



* W 



add another element tending to delay in re -stocking. During the long pe- 

 riod thus required for recuperation, the accumulation of interest charges and' 

 taxes would not justify holding the land, for the relatively meagre crop 

 to be obtained. From such facts as these, it becomes evident that 

 where forests have been cut clean, or even in cases where the growth has- 

 been reduced below a certain limit of size, it will be impracticable for any- 

 individual or business corporation to undertake the reforestation with a view 

 to ultimate profit, and, under such circumstances, it becomes an operation, 

 which can be carried out successfully, only when under Government super- 

 vision and control. 



It is, however, quite possible to cut over forest lands in such a way as to 

 ensure continuous and profitable returns within reasonably short periods. 

 Thus, if the inferior cutting limit be ten inches in diameter, the same yield' 

 may be obtained at the end of thirty-six years. If, on the other hand, the 

 inferior limit be raised to twelve inches diameter, the same quan- 

 tity of lumber may be cut in twenty - four years ; and yet again, if 

 the inferior limit be raised to fourteen inches, an equal amount 

 may be cut at the end of nineteen years. It by no means follows, 

 however, that the best results are to be ybtained by following 

 this course of reasoning to a strictly logical conclusion, since 

 other factors must be considered. Thus, 30,000 acres, yielding an 

 average of 3,000 feet of lumbsr per acre, when cut to a limit 

 of ten inches, will yield 2,500,000 feet per workable area of 

 833 acres. If cut to a limit of twelve inches, the yield will 

 be 3,125,000 feet from a workable area of 1,250 acres ; and if 

 the limit be fourteen inches, the yield will be 2,125,000 feet 

 from a workable area of 1,579 acres ; whence it appears, 

 that it is altogether most profitable to cut to an inferior limit 

 of twelve inches, making the equal cuts in periods of twenty - four- 

 years. 



