TREES AM) FORESTRY 



59 



51. KNOCKING SEEDS OUT OF PINE CONES 



Cleveland National Forest, California 



are kept thinned and pruned. Such a cared-for tract may yield 25,000 

 B. M. per acre, five times the average yield of Michigan white pine forests. 



The following figures are interesting for owner- of New England abandoned 

 farms: 



Average cost per acre of land s4.imi 



Average cost of raiding and planting seedling white pines . . 4 .84 



Average taxes at 2 per cent for40yrs 3.20 



$12.04 



Compound interest for 40 yrs. making total cost $50.99 per acre. 



Average yield per acre box-board timber, 40 cords, at S4 per 



cord $160 



Net profit §109.01 per acre. 



