340 APPENDIX 



"Wind mantle. A screen' of trees, commonly used to designate the dense 

 border of a woodlot or forest which prevents penetration of wind into 

 the interior. 



G., Waldmantel. 



Wolf tree. A tree occupying more space than its silvicultural value 

 warrants, curtailing better neighbors. A term usually applied to broad- 

 crowned, short-stemmed reserves. 



Woodland. See Forest. 



Woodlot. See Forest. 



Working block. See Subdivision. 



Working capital. See Capital. 



Working circle. See Subdivision. 



Working figure. See Subdivision. 



Working period. The period of years during which the working plan is 

 intended to apply. 



Working plan. The plan or plans under which a given forest property is 

 to be continuously managed. Annual or Periodic plans may be based 

 on the general working plan and may refer to any specified class of 

 work, as the annual cutting or felling, planting, protection, grazing, or 

 administration and improvement plan. Such annual plans may be 

 either mere schedules or may contain more or less detail, explanations, 

 estimates of cost and results, as seems desirable. 



Working plan control. The records of the progress of the work on the 

 forest as outlined by the working plan. In European practice these 

 records are kept by maps and books. The entries are made periodi- 

 cally or at the time of completing each of the various projects. This 

 control operates as a check on the execution of the working plan. 



Working section. See Subdivision. 



Working unit. See Subdivision, 



Yield. The timber or wood volume that is (actually) or can be (nor- 

 mally) produced by a stand of a given composition at a given age under 

 given site conditions and treatment — the actual or normal product of 

 the stand. See Normal. In finance, may be expressed as money yield. 

 The term Yield involves the idea of futurity, hence for a statement 

 of actual material on hand the term Stock is preferable. For the ex- 

 pression Regidation of yield, the expression Regulation of cut or of 

 felling budget is preferred. 



Yield table. A tabular statement of periodic yields attainable at differ- 



