THE THEORY AND PRACTICE OF WORKING PLANS 177 



Control and revision of the working plan are provided for 

 by means of the control book, the chief note-book (Hauptmerk- 

 buch), and the area register. 



The control book serves the double purpose of checking the 

 estimate and the allowed annual cut. For the allowed cut 

 must be adjusted according as the estimates are shown to be 

 too high or too low. If too high, there will be a deficit at the 

 end of the period; if too low, there will be a surplus. The 

 allowed annual cut is not strictly maintained; silvicultural or 

 market conditions may necessitate a higher or lower cut.* 

 Of course this must be offset by reducing or increasing the 

 cut in the years following. 



Each cutting is entered in the control book. Part A, where 

 for each Jagen, or District (compartment), there is a page 

 whereon to show the time and kind of cutting, the species, and 

 the amount obtained by classes of material. 



When the cutting of a stand is finished the result is com- 

 pared with the estimate and the difference entered in control 

 book, Part Ai, which is arranged as follows: 



Column I. Block. 



2. Compartment. 



3. Subcompartment. 



4. Year in which cutting is completed. 



5. Estimate in cubic metres by species. 



6. Actual cut in cubic metres by species — from con- 



trol book, Part A. 



7. Plus difference in cubic metres between columns 



5 and 6. 



8. IVIinus difference in cubic metres between columns 



5 and 6. 

 At the end of each year f a balance is struck, and the result 

 of this comparison between the estimate and the actual cut is 



* An Oberforster (superx'isor) may not exceed the allowed annual cut by 

 more than 5 per cent without the consent of the district office; over 10 per cent 

 requires the consent of the central office in Berlin. 



t Formerly every three years. 



