FOREST REGULATION 497 



fore been disregarded. Similarly the influence of such catastrophic 

 yield reducers as large fires has been disregarded, since their effect is 

 also indeterminate, and since development of protection will, with occa- 

 sional exceptions, make the effects of these generally negligible. These 

 two factors are so indefinite in their bearings that for preliminary in- 

 formation as to regulation figures, which is all that can be hoped for at 

 present, they need not be weighed. The fact that the basic data itself 

 is to a marked extent extensive has greater weight, and in spite of this 

 the conclusions are valuable. As a safeguard against serious blunders 

 all figures have been kept conservative. 



All these factors will be of indeterminate influence only for a few 

 years at a time, since the working plan data will have to be worked 

 over again every five or ten years as additional intensively obtained 

 information becomes available, and as development, both in changes in 

 timber stands themselves, and more especially of local economic condi- 

 tions becomes more definitely observable. 



The estimated annual yield figures on which regulation on the forest 

 is based, are, for the total fifty-four million feet, board measure, dis- 

 tributed in the Lakes Working Circle, seventeen million; the River 

 Working Circle, twenty million; and the North Fork Working Circle, 

 seventeen million. It is not intended that the annual cut in each circle 

 should adhere closely to this indicated cut. Because: (1) Logging 

 itself on each working circle is still nowhere near settled, as to annual 

 extent, and greater or less cuts temporarily maintained would for the 

 present have little influence on community development. (2) Logging 

 improvements for regular and efficient work are still to be in most 

 places made and occasionally special large bodies of timber may have to 

 be marketed to obtain these. (3) Seasonal variations may cause delays 

 or other modifications of logging plans. (3) There already exists a 

 small local surplus aside from the general surplus in stock, saved up 

 within the last few years because of failure to utilize even to the above 

 limitations, so that the usual sustained yield would, broadly, not be 

 affected. 



It is proposed that for the present at least, these figures can be 

 varied up or down as much as 20 per cent in any one year, either by 

 working circles or less preferably by the forest as a whole, but with 

 the restriction that in any twenty-year period the average annual cuts 

 by working circles will be approximately these figures. The ideal, of 

 course, would be to approach the actual annual cuts as indicated just as 

 nearly as possible. 



These amounts represent actually the figured yield on the white pine 

 type alone in only the accessible blocks of each of the working circles, 

 obtained by a modified application of the Austrian formula, figuring the 

 removal of the surplus to be distributed over thirty years, a liberal 

 period, at the end of which tirfie the less merchantable types and blocks 

 will be economicallv accessible. 



