64 



GENERAL GROWTH OF STUDIES 



ured and the volumes calculated and plotted. The object of this problem 

 is to illustrate the fundamental principles involved in all volume growth 

 determinations based on analyses. In the different problems involved slight 

 modifications are of course necessary in the method of collecting data and in 

 the method of working them up into the final table. These will be empha- 

 sized in the succeeding problems. The underlying principle in the study is 

 to reconstruct each tree analyzed on the basis of its dimensions 10, 20, etc., 

 years ago. 

 Illustration. — To Determine the Volume Growth of an Individual Tree in 

 Cubic Feet and in Board Feet, Based on Age. 



A. Data Required. — Complete stem analysis. Use tree number 116 in Data 



Series V. 



B. Method of Procedure. 



1. Calculate the volume in cubic feet without bark of the whole stem for 

 each 10-year period in the life of the tree, using Smalian's formula 

 for contents of logs, the cylinder formula for stumps, and the cone 

 formula for tips above the last log, as follows: (Calculations for 

 5 to 7 ten-year periods will illustrate the problem.) 

 (a) On a sheet of note paper arrange a blank form like the following. 

 Preserve all calculations on this form. 



Cross Cut 



Diameter 



Inside Bark, 



Inches 



Area, 

 Square Feet 



Section 



Length of 

 Section 



Volume, 

 Cubic Feet 



Volume, 

 B.M. 



1 

 2 

 3 

 4 

 Etc. 



Stump 



1st Log 



2d Log 



Etc. 



Tree 10 Years Ago (Give Age) Total Volume. 



