254 C'OTJ-ECTION OF STATISTICS, 



yield tables or other statistical purposes. Fairl}' approxiuiale 

 data suffice for the purposes of working plans. 



In the case of even-aged, or nearly even-aged, woods, one or 

 more sample trees are examined. If considerable differences 

 of age exist in a wood, the limits should be given and the 

 wood placed into that age class, to which it belongs according 

 to its economic character. If some older or younger groups 

 exist, which are not of sufficient extent to be enumerated as 

 separate woods, this should be mentioned. The same holds 

 good for a limited number of standards, which are to be held 

 over for a second rotation, or for young growth, which has 

 sprung up in an old wood. 



In the case of woods, which have been kept back in their 

 development, the economic and not the actual age must be 

 given. For instance, a young wood, which has stood under 

 heavy shelter and is now 80 years old, but of a development, 

 which is ordinarily reached in 10 years, must be entered as 

 10 years and not as 80 years old. 



In the regeneration class, the age of the overwood and 

 underwood must be given separately. 



In selection forests, it suffices to give the limits of the age 

 gradations, ^Yhich are frequently determined by the number of 

 years, during which cuttings go once round the forest. 



In coppice with standards, the ages of the overwood and 

 underwood are given separately ; for the former, the limits of 

 the existing gradations are given. 



The age of coppice can generally be easily ascertained from 

 the time, when the last cutting occurred. 



(;. Oriij'm and Pad Treatnient. 



Whenever the necessary data can be ascertained, a short 

 history of each wood should be prepared, giving the method 

 of formation, whether by natural or artificial means, planting 

 or sowing, the manner in which the wood has been tended, 

 cleanings, thinnings, pruning, natural phenomena, which have 

 affected the development, etc. Such a history is very useful 



