274 ILLINOIS ACADEMY OF SCIENCE ' 



board foot volume tables based on diameter breast high and 

 number of sixteen foot logs. Such a table is found on 

 page 22 of Farmer's Bulletin 715, U. S. Department of 

 Agriculture, "Measuring and Marketing Woodlot Pro- 

 ducts", which also gives a full description of the strip 

 method of estimating timber and working up the contents 

 by means of volume tables, based on the Scribner rule. 



Brief Description of Tracts Estimated. 



Tract A. Oak-Hickory Forest. (Serena Township, Sec. 33). 

 This tract was located on the road about three miles from 

 Wedron and grazing had been lighter in it than most of 

 the others in that region. Some scattered cutting of small 

 white oak for mine props had been done and the heavy 

 growth of hazel and raspberry bushes in some places 

 showed that cutting had been too heavy. Good corn was 

 growing on an adjacent part that had been cleared, indi- 

 cating good soil. Omitting the tally sheet for 4.7 acres of 

 strip survey, the main facts are about as follows : 



Average number of trees per acre 203 



Number of trees 3 inches in diameter or less ... 48 per acre 

 Stand per acre 2,208 board feet. 



Per cent of species 



White oak 64% 



Black oak 19.5% 



Shagbark Hickory 14.6% 



Bur oak 1 



Red oak [ 1.9% 



Cherry J 



Total 100.0% 



Tract B. — Upland dry oak forest. ( Serena Township, Sec. 

 33). 



The stand here was composed mostly of white, black and 

 red oak, with some basswood and elm in the wetter por- 

 tions. Judging from scattered poplars, the signs on the 

 trees, the growth of golden rod and absence of humus it 

 seems that the forest had been repeatedly burned. While 

 at first appearance it would not rank with tract A, the vol- 

 ume really ran higher because of the presence of more 

 medium sized trees. It was unfenced and was the common 



