11 CONTENTS. 



Section VI, — The kotation ob exploitable age. Page. 



1. Meaning of the term .... ..... 27 



8. Calculation of the exploitable age ...... 28 



5. Exploitable age for State forests . . . . . . - . 29 



Section VII. — The possibility. 



1. Meaning of the term ........ 30 



2. Methods of presaribing the possibility ..... .31 



^. An equal annual sustained yield ....... 32 



Section VIII. — Rbtenue and inteeest. 



1. Meaning of tlie terms ..,.....• 32 



•2. Kevenue is the net value of the produce ....... 32 



3. Relation of revenue to area ........ 33 



4. Interest ........... 34 



TART IL— PREPARATION OP THE WORKING-PLAN. 



CHAPTER I.-PEELIMINARY WORK. 



Section I. — Reconnaissance of the aeea. 



1, Selection cf the area to be dealt with .35 



-2. In formation to be collected .... ... ,36 



'3. Maps 38 



Seciion II. — Choice of method of tebaimeni. 



1. Sub-division of the aiea-into portions requiring different treatment . 39 



'2. Choice of the method to be applied ....... 39 



Section III.—Foemation of wobkinq oiboles and felling sbeies. 



1. Rules regarding the selection of working circles ..... 43 



2. Rules regnrding the formation of felling series ..... 44 



Section IV. — Analysis abd desobiption of the chop. 



1. Sub- division of the area . 45 



2. Detailed description of each sub ■division ...... 46 



S. Stock maps 51 



Section V.— Enumeeation sueveys. 



1. Enumeration surveys : when required : methods in use ... 53 



2. Choice of method 54 



-3. Method of " Partial enumeration " ....... 65 



