TAKING STOCK. 



interspaces ; and this, supplemented by a cross 

 section, CD, would afford a good general average 

 of the forest. Then adding all the diameters to- 

 gether in one column, and all interspaces together 



in another, and taking the mean of each, we say, as 

 the square of the mean interspace is to the square 

 of the mean diameter x '7854, so is 43,560 (number 

 of square feet in an acre) to the ground area of 

 timber per acre ; and having the area of the forest, 

 and taking the height of a few trees of different 

 girths as averages, we are enabled to determine 

 approximately the cubic contents of the block, 

 and the proportion of trees of various girths. 



It will be observed from the diagram that one 

 does not proceed forward in a straight line, but 



