137 



There is therefore an existing surplus stock of 65,871-21,000, or, say, 44,000 

 exploitahle trees. 



The condition of the crop shows that trees of Class III are markedly deficient, 

 and that there will he a dearth of exploitable trees 40 years hence, and indeed there- 

 after until the present stock in Class IV matuies 80 years hence. 



A preparatory period of 80 years is, therefore, necessary in order to properly 

 constitute the stock ; and it is prdposed to spread the felling of the surplus stock of 

 44,000 trees over this period (or rather to diminish the fellings of the you.iger stock 

 proportionately). The annual fellings should, therefore, be within (44,000-f-80) + 2,000 

 trees, or about 2,550 trees a year. 



Period for which the fellings are prescribed. — The time 

 during which, the felling operations are prescribed in detail 

 should be explained and justified. In the case of selection 

 fellings the period chosen would be the length of the felling 

 rotation, and the rotation should, therefore, be justified. 



JExamjile. — It is desirable, in order that the area worked over each year should 

 not ba inconveniently large, that the felling rotation should be as long as possible 

 without risking the loss of trees which die or fall in the interval between the fellings. 

 It is considered that 20 years is the utmost limit that can be allowed under these con- 

 ditions. The length of time required for trees of the lowest dimension of Class II to 

 attain the lowest exploitable dimension being 40 years, it will be convenient to take 

 that period as the basis in fixing the felling rotation. Consequently a felling rota- 

 tion of 20 years, or half the period, has been adopted, and operations are prescribed 

 for that length of time. 



Areas to be felled annually or periodically. — The formation 

 of the annual or periodic coupes should be explained, and 

 the calculation by which the size of the coupes has been 

 determined should be given with such detail as the circum- 

 stances in each case require. Such calculations have already 

 been illustrated by examples. 



The allocation of the fellings should be discussed where 

 necessary and the proposals made justified, important de- 

 partures from the rules regarding the allocation of the fel- 

 lings being explained. In the case of the selection method, 

 the order followed in making the fellings is of little import- 

 ance provided that some order is adhered to ; but, where one 

 or two species only are exploitable, it may be necessary to 

 form coupes of equal resources as regards these species. 



Example.— fha order to be followed in making the fellings would, under normal 

 conditions, be as they are numbered 1, 2, 3, etc.; but as coupe No. 14 contains many 

 mature and over-mature trees it is desirable to take it in hand at once. Moreover, as 

 the mature trees are in excess, and as there is a surplus stock which must be removed, 

 an excess felling is justifiable. It is, therefore, proposed to work coupe No. 14 in 

 addition to coupe Ko. 1 in the first year, returning again to No. 14 in the usualorder 

 in the 14th year of the felling rotation. By this means, after the first year, it will 

 be possible to resume the regular order. 



Eules regarding the conduct of the fellings. — The special 

 statement of fellings should be accompanied or followed by 

 such general instructions, with regard to the manner in which 

 they should be executed, as may be necessary for the guid- 



