VALUATION SURVEYS 61 
flat, Hardwood land, and Spruce slope ; and second, ac- 
cording to the yield in thousancs of board feet of all 
trees ten inches and over in diameter. 
Within each class of these groups the average number of trees 
per acre of each inch in diameter was first calculated, and then the 
average diameter, height, and number of trees per acre were com- 
puted for trees six inches and over in diameter, ten inches and 
over, twelve inches and over, and fourteen inches and over, as well 
as the average number of trees per acre under two inches and from 
two to six inches in diameter. 
The average diameters and heights and the average number of 
trees per acre being known, it was possible to determine the yield 
in board feet and standards from the Volume Tables already given. 
The yield was found first for trees fourteen inches and over in 
diameter by multiplying the number of trees by the value in the 
Volume Tables corresponding to the average diameter and height. 
In the same manner the contents of trees twelve and thirteen 
inches in diameter, ten and eleven inches, and six to nine inches 
were computed and added to that found for trees over fourteen 
inches, and the total contents of all trees six inches and over, ten 
inches and over, and twelve inches and over were found by ad- 
dition. 
The following tables (15 and 16) give the condensed 
results of the 1046 valuation surveys as to number of 
trees, dimensions, and yield, per acre, classified ac- 
cording to situation. 
