FOREST ECONOMY. 223 



This merely geometric subdivision serves the pur- 

 pose of easy orientation ; it enables the forest reg- 

 ulator in his working plan to properly ascertain and 

 describe the stock, and to plan the treatment of each 

 compartment, and it enables the manager readily to 

 locate and apply the prescriptions of the working 

 plan. A number of these units may then again 

 be combined into subdistricts or ranges for pur- 

 poses of administration, fire patrol, etc., while all 

 those which are to be managed under one silvi- 

 cultural system are, at least in the working plan, 

 segregated as zvorking blocks or working sections, 

 from those to be managed under another silvi- 

 cultural system (coppice or timber forest, etc.), or 

 under another rotation. 



These various subdivisions are all noted on maps, 

 as is also, by colors, shadings, and signs, such de- 

 scriptive matter as is desirable to present a clear, 

 comprehensive picture of the actual forest condi- 

 tions, and to indicate the changes which are to be 

 attempted. 



One of the important prescriptions in the work- 

 ing plan, especially wherever clear cutting systems 

 are to be applied, or where species liable to wind- 

 fall are involved, is the estabhshment of a proper 

 sequence or collocation of felling areas — felling 

 series {Hiebsfolge). (See p. 186.) 



Since danger from fire threatens the young crop 

 more than old timber, especially in pineries, it is 

 desirable to decrease the risk by making the fell- 



