212 FARM ARITHMETIC. 



12, can have three hundred two-post trees an acre in 30 

 years. If the thinnings are assumed to provide for the 

 necessary renewals for 30 years, how many acres of for- 

 ests must be planted and maintained to furnish the needed 

 posts ? 



758. A farmer owns 30 acres on which he wishes to 

 plant European larch, set 4 feet apart in rows 6 feet apart. 

 How many seedlings must he plant? 



GROWING TIMBER AS FARM CROP. 



These are hardy catalpas. One season's growth, second year from planting out, 

 and cut to ground in spring after planting. 



759. A farmer had a woodlot of hickory and oak in 

 equal proportions, from which he sold half the wood, 50 

 cords, for firewood at $6 a cord. Afterwards a furniture 

 maker offered him $100 per thousand board feet for the 

 remaining oak, and a wagon maker offered him $50 per 

 thousand board feet for the remaining hickory. He found 

 that he could cut half as many thousand board feet as he 

 had cut cords. How much did he receive for the rest 



