32 



SECOND-GROWTH HARDWOODS IX CONNECTICUT. 



of the available growing space. Later these plots were checked on 

 the total basal area per acre. By this is meant the sum of the cross- 

 section areas at breast height of all the trees in a measured sample of 

 the stand, usually expressed in square feet. It varies with the 

 number of trees, their average diameter, and consequently the age of 

 the stand, and is one of the best means of judging whether a stand of 

 known age is fully stocked or not. The average total basal area per 



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Fig. 1. — Height growth of dominant trees, chestnut type. 



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acre of all the measured plots was then determined, and all plots the 

 total basal area of winch was greater or less than the average by 10 

 per cent or more were assumed to be abnormally stocked and were 

 ehminated from further computation. The yield tables are, therefore, 

 based on average fully stocked stands. The method of elimination 

 is illustrated graphically in figure 2. 



In the yield tables themselves the average basal area by five-year 

 periods is shown for each type and for each quality class. The 



