TERMS m FORESTRY. 27 



Windbreak, n. 1. The breaking of trees by wind. 



2. /See Shelterbelt. 



3. See Windfall. 



Windfall. 1. A tree thrown by wind. 



2. An area on which the trees have been thrown by wind. 

 Syn. windbreak. G., AVindbruch. F., volis. 

 Wind-firm, a. Able to withstand heavy wind. 



G. , sturmfest, windfest. F. , resistant au vent. 

 Wind mantle. See Shelterbelt. 

 Woodland, n. See Forest. 

 Woodlot, n. See Forest. 



Work, V. To harvest the final yield under a working plan. 

 Working, n. The harvesting of the final yield under a working plan. 

 G., Betrieb. F., exploitation. 



Working is a.Mual when cuttings are made each year; periodic when they are 

 made after uniform periods of two or more years; and intermittent when they are 

 made at irregular intervals. Sustained annual, periodic, or intermittent workings 

 are those under which the amount of wood cut is so regulated that the productive 

 capacity of the forest does not decrease, but produces a sustained yield (G., Nach- 

 haltsbetrieb. F., exploitation a rendementsoutenu), which likewise may be annual, 

 periodic, or intermittent. 

 Working" area. The total forest area managed under a working plan. 



Syn.: working circle. G., Wirtschaftseinheit. F., unite d' exploitation. 

 Working- circle. See Working area. 



Working* plan. A detailed and comprehensive scheme for the best permanent use 

 of a forest. 



G., Wirtschaftsplan. F., plan d' exploitation. 

 Working" plan renewal. The preparation of a new working plan for a given tract, 

 when the present working plan has been carried out, or changed conditions require 

 its revision. 



Yield, n. The amount of wood at present upon, or which after a given period will 

 be upon, a given area. See Present yield; Future yield; Accident yield; Inter- 

 mediate yield ; Final yield; Working. 

 G., Ertrag. F., rendement. 



Yield table. See Present yield table; Future yield table. 



