114 



the actual results of the past. An attempt should in all 

 cases be made to estimate the cost of proposed works of im> 

 provement. 



When the areas to be felled have been decided upon, it will generally be necessary 

 to make a forecast of the outturn of trees, or of material to be removed, so a« to ^ti- 

 mate the linaDcial results of tbe proposed scheme of working. This estimate may be 

 based either t>n an enumeration of the mature trees in- the forest, on tbe previous out- 

 turn, or on experimental area fellings, etc. The enumeration should not, however, be 

 mistaken for a calculation of the possibility, such as is made when fellings are pre- 

 scribed' by volume of material or number of trees. 



