180 THE THEORY AND PRACTICE OF WORKENG PLANS 



istration of the forest. With the advent of frequent statistical 

 reports and inspection trips, this last fell into abeyance. Reg- 

 ular revisions come at the close of the twenty-year period, 

 however, as explained above, an intermediate revision is provided 

 for during the eleventh year of the period. 



The work of revision is similar to that of a new working 

 plan; the degree of revision necessary depends on the changes 

 which have occurred. Preparatory to the revnsion, each portion 

 of the forest is carefully gone over to determine its present con- 

 dition as compared with the condition at the time the estimate 

 w^as made, in order to form an adequate basis for judging the 

 effectiveness of the measures of the working plan, their further 

 usefulness, and extent to which they require revision. The 

 results of this examination are presented in brief — oftentimes 

 tabular — form, especially as concerns cuttings, plantings, finan- 

 cial results, changes in area, servitudes, and the like. 



Revisions are made by the Oberforster (supervisor) him- 

 self, aided, where necessary, by men especially detailed, as 

 in the case of the original estimates. All revisions are based 

 on a conference between the officials concerned, following the 

 precedent of the working-plan conference; this conference 

 decides upon the further usefulness of the working plan as it 

 stands, just what revisions are to be undertaken, and along what 

 lines. 



The following are given as the chief considerations in the 

 revision of a working plan: 



(i) The correction of the surveys and estimates. The area 

 register and the second part of the chief note-book together 

 with the forest maps posted to date are aids in this. 



(2) Review of the accomplished cutting and reproduction. 

 The bases of this are the control-book and the chief note-book. 

 As an index to the results of management, the cut is totaled for 

 the period; in addition there is compiled from Part Ai of the 

 control-book a comparison of the estimated cut with the actual 

 cut; the areas planted or sown during the period are also sum- 

 marized. 



