WORKING-PLAN. 133 



continuous series occurring on adjacent areas year after year, 

 because it is only thus that attacks of pine weevils in Conifer 

 woods can be prevented. In broad - leaved woods, however, 

 there is no necessity for this, and the main object here is to 

 try and arrange the falls against the most dangerous wind. In 

 drawing up the rough sketch for the felling-plan, areas are 

 transferred from period to period, and particularly during the 

 I. and II. Periods, comprising the mature and the maturing 

 woods, so as to get about an equal fall of mature timber from 

 year to year, and gradually in course of time to attain a nor- 

 mally proportionate distribution of the various age - classes 

 throughout each working -circle. A fair idea of the way of 

 doing the above may perhaps be got from the example on 

 pp. 134, 135. 



In elaborating the felling-plan so as to estimate scientifically 

 the annual fall to be made during the first 10 years and the 

 second 10 of the first period (I 1 , and I 2 .), the total yield and 

 increment must be worked out, the increment being calculated 

 up to the middle of each sub-period i.e., for the next 5 years 

 in I 1 ., and for 15 years in I 2 ., in the manner indicated on 

 pages 128, 129. 



But this necessarily means much more time and expense in 

 preparing the Working - plan, so that the tabular statement 

 on pp. 134, 135 will usually suit the conditions at present pre- 

 vailing in British woodlands. Or something even simpler may 

 perhaps sometimes be considered quite sufficient, on some such 

 lines as the Working-Plan on pp. 136, 137. 



The Explanatory Note gives first of all a brief description 

 of the woodlands, and their soil, situation, condition, rate of 

 growth, &c., then describes the object aimed at in the Working- 

 plan, and states the reasons for the recommendations made as 

 to kinds of crops, methods of treatment, rotation, and fixing 

 the felling-series and the annual falls, and concludes by making 

 any recommendations that may seem desirable regarding felling, 



