52 



MEASUREMENT OF WHOLE WOODS. 



Calculation of Volume by Inch Classes, Four Groui>s, and 



FOE One Acre of Scotch 



2. Modifications of the General JMctlwd. 



It 1ms been shown above, that the vokime of a ^YOod is 

 represented by the formula : — 



Si S2 .s-3 



It is obvious, that, as Ion" as the fractions — , '~,-^ . . . 



,Si S2 S3 



differ, the volunies of the sample trees in the several classes 

 must be measured separate!}'. In order to avoid this incon- 



