52 



ANALYSIS. 



The cross sections of each group are averaged in order to obtain the 

 measurements of the cross sections of the average tree of the group, 

 which is then constructed and analyzed in the manner discussed under 

 caption ''Rate of growth " in preceding iDages. 



As an example, the analysis of the dominant group is given below. 

 It begins with averaging the widths for the groups of rings from center 

 to periphery for each of the cross sections from which the area and 

 accretion are calculated. 



Cross section of the stump of the average tree of the group. 

 Site/. — DominaDt group of 16 trees. 



Cross Section: Stump. 



Heiglit from ground, 2 feet. 

 Width of bark, 43 millimeters. 

 Number of rings in sap, 35. 

 Width of sap, 32 millimeters. 

 Total number of rings, 249. 



Xumber 











Accretion for 



of rines 











decades 



(centerlo 



Eadius. 



Diameter. 



Area. 







periph- 

 ery). 











Area. Diameter. 



■ 



Mm. 



Mm. 



Inches. 



Sq.ft. 



Sq.ft. 1 Indies. 



10 



29 



58 



2.3 



0.03 



0.03 2.3 



20 



64 



128 



5.1 



.14 



.11 ' 2.8 



30 



93 



186 



7.4 



.30 



.16 2.3 



40 



119 



238 



9.5 



.59 



.19 2. 1 



50 



143 



286 



11.4 



.71 



.22 1.9 



60 



166 



332 



13.3 



.96 



.25 t 19 



70 



193 



386 



15.4 



1.29 



.33 2.1 



80 



215 



430 



17.2 



1.61 



.32 , 1.8 



90 



231 



462 



18.5 



1.87 



.26 ; 1.3 



100 



246 



492 



19.7 



2.12 



.25 1.2 



110 



269 



538 



21.5 



2 5'' 



.40 j 1.8 



120 



287 



574 



23.0 



2^88 



.36 1 1.5 



130 



304 



608 



24.3 



3.22 



.34 1 1.0 



140 



■320 



640 



25.6 



3.57 



.35 1 1.3 



150 



334 



668 



26.7 



3.89 



.32 1 1.1 



160 



345 



690 



27.6 



4.15 



.26 



.9 



170 



357 



714 



28.6 



4.46 



.31 



1.0 



180 



369 



738 



29.5 



4.75 



.29 



.9 



190 



379 



758 



30.3 



5.01 



.26 



.8 



200 



390 



780 



31.2 



5.31 



.30 



.9 



210 



401 



802 



32.1 



5.62 



.31 



.9 



220 



411 



822 



32.9 



5.90 



.28 



.8 



230 



422 



844 



33.8 



6.23 



.33 : .9 



240 



432 



864 



34.6 



6. 52 



.29 .8 



249 



"' 



874 



35.0 











