GRAPHIC ANALYSIS. 25 



In the following graphic analysis, which embodies all data pertaining 

 to this study, the variable chosen as the dependent variable is diameter 

 breasthigh in inches. With but one exception (age-identification 

 relations, which are based on age) it has been used throughout as the 

 basis of comparison, and a complete analysis based upon it has been 

 made for whole trees, butt logs and top logs, with the object in view to 

 show both quantity and quality of the whole trees, of the butt logs, or 

 best part of the tree, and of the top logs, the poorest part of the tree. 



The complete data for each individual tree, as shown in Plates II to 

 X were first assembled, each tree having a woods sheet, a stem analysis 

 sheet, and as many mill sheets as there were logs in the tree. These 

 assembled data, representing nine hundred and nineteen trees in all, 

 were then divided, according to the identification made in the woods 

 into two groups ; typical yellow pine forming the one, which proved to 

 be mature yellow pine ; and bull pine or blackjack, which proved to be 

 immature yellow pine, forming the other. There was a total of five 

 hundred and seven immature, and four hundred and twelve mature 

 trees. A complete analysis was made separately of each group, and the 

 results have been averaged by means of curves and arranged on opposite 

 pages of this publication so that a comparison might be easily followed. 

 The trees of each group were arranged in classes, according to diameter 

 breasthigh measurements, such that all trees ranging from 19" to 20.9", 

 inclusive, formed the 20" diameter class, and all trees ranging from 

 21.0" to 22.9", inclusive, formed the 22" diameter class, and so on. Cor- 

 responding determinations of each diameter class were then added 

 together and the arithmetical averages obtained by dividing the sums in 

 each case by the total number of trees in the class. 



Butt logs and top logs from immature and mature trees were analyzed 

 in a similar manner, and the results averaged and arranged on opposite 

 pages the same as for whole trees. 



The original determinations averaged for each diameter class were as 

 follows : 



Clear length. 



Merchantable length. 



Total height. 



Diameter of last log used. 



Thickness of bark. 



Height of stump. 



Age. 



Total volume in cubic feet inside bark from stump to height where the 

 tree is 6" in diameter outside bark. 



Total volume in board feet as shown by the Spaulding Log Rule. 



Total volume in board feet actually "sawed out" at mill. 



Total volume of each grade in board feet contained in each tree 

 actually "sawed out" at mill. 



