THE THEORY AND PRACTICE OF WORKING PLANS 223 



veys; in logging methods; substantial injuries to the forest by- 

 man, climate, fire, etc.; the progress of the hunt and of fishing; 

 personnel; statistics of volume yield and money returns; forest 

 experiments, etc. It corresponds closely to the general part 

 of the Prussian " Hauptmerkbuch." 



(2) The management book corresponds to the Prussian 

 control book, together with the specific part of the Prussian 

 " Hauptmerkbuch." It is divided in two parts: The first gives 

 for each subcompartment (figure of control — " Kontrollfigur ") 

 the yield of cuttings by classes of material and area, the com- 

 pleted seeding and planting, and the early care of the stand. 

 The second part contains the total annual cut of the whole 

 forest (working unit, " Wirtschaftsbezirk ") compared with the 

 estimate. 



(3) Index of changes in status, comparison of the total 

 annual actual with the allowed cut in volume and area; sum- 

 mary of accidental — i.e., unforeseen — cuttings, of plantings, 

 of receipts and expenditures, of net income, etc. 



Regular revisions are made in the last year of the ten-year 

 working period; revisions may be necessary between times if 

 unforeseen contingencies occur, such as large windfall, insect 

 damage, change of area, etc. The most important tasks of the 

 revision are: First, the determination of whether the provisions 

 of the working plan just terminating were observed in every 

 detail; whether and to what extent the departures therefrom 

 were justified; and whether the prescriptions of the working 

 plan proved correct, singly and collectively. Second, the cor- 

 rection of the existing maps and estimates which may neces- 

 sitate the collection of additional field data. Third, the prep- 

 aration of the working plan for the next ten years. 



