138 



In determining the average yield per acre of farm wood-lots it was 

 considered more accurate to assume that when the total production of 

 the given class of product for the state was known, that for the farm 

 woodlands would bear the same proportion to this total as the wood- 

 lands themselves bore to the total forested area. This proportion is 

 93.166 per cent. The alternative of multiplying the results obtained 

 from questionnaires representing 440 units of 19,986 acres, or 86/100 

 of 1 per cent of the farm woodlands was considered less reliable and 

 in some instances was manifestly in error for the state as a whole. Pro- 

 duction of cord wood and of fence posts was based upon this question- 



Peoduction of Wood riioir Illinois Pabm-Woodlaxds 

 OF 2,668,050 Acres 



Product and unit 



Total for farm 

 woodlands 



Average per acre 



Average per 



wood-lot of 



27 acres 



Fuel wood 



cords 



Mine timbers 



cubic feet . . . . 

 Posts 



piece 



Lumber 



board feet .... 

 Cross-ties 



piece 



Veneer logs 



board feet . . . 

 Piling 



piece 



Cooperage stock 



cubic feet .... 



885,792 

 11,142,700 

 10,031,860 

 53,011,340 



952,050 



22,701,710 



37,708 



350.293 



.332 

 4.176 

 3.76 

 19.869 



.357 

 8.508 



.0141 



.131 



8.96 

 112.75 

 101.52 

 536.46 



9.64 



229.72 



.38 



3.54 



Quantities of Wood cut annum.i-y from Farsi Wood-lots 



