acre necessary for wood production at this rate varies within wide 
limits, as shown in the footnotes to Tables 64, 96, 128, and 160. 
The plots measured as a basis for the yield tables in this study 
were all normal, or fully stocked. They were selected in the 
field because the number of trees per acre and their distribution 
appeared satisfactory, and because there were no large openings 
between the crowns of the trees. Final judgment on their nor- 
mality or fullness of stocking was based on comparisons of their 
total basal areas (sum of the cross-section areas of all trees at 
breastheight) with the average of all similar plots measured. 
Those found to be abnormal by this test (see the references cited 
in footnotes 2 and 3) were eliminated from subsequent computa- 
tions. Because of frequent ground fires, hog damage, and lack 
of sufficient seed trees, normal stands are comparatively rare 
and represent but a fraction of the second-growth stands in the 
South. In selecting plots some leeway as to the meaning of full 
stockings was necessary in order that a sufficient number might 
be found without unreasonable expense. Since the tables give 
the average figures for the plots studied, they do not, strictly 
speaking, represent maximum possible volume. The additional 
fact that the great majority of the stands chosen had at one time 
or another been burned over (few unburned areas are known) 
and had developed naturally, should also assure higher yields 
than are shown in the tables, when protection and Ie NapeLe 
are introduced. 
8 The elimination of abnormal plots explains the discrepancy in the number of plots 
given as the basis for the height-growth classification graphs, Figures 1, 2, and 4, and 
the number of plots listed in Tables 64, 96, and 160. 
17 
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