132 PRACTICAL FOREST MANAGEMENT. 



attempted by Troup in his Thano Working Plan : such an arrange- 

 ment never lasts and is unnecessary. With the frequent revision 

 of plans now possible in the United Provinces it gu.iorally suffices 

 to allot the regeneration area and to re-distribute this at subse- 

 quent revisions on the lines of the French " quartier bteu " system. 

 In Kanikhet, Naini Tal, and Central Almora the chir pine is 

 managed on a rotation of 120 years divided into five periods of 24 

 years, of which only periodic block I- is completely allotted. 

 Similarly, the Eegular Working Circle- of Kulu consisting of deodar 

 and its associated species is managed on a rotation of 120 years 

 divided into four periods of 30 years, of which only periodic block I 

 is allotted. The latest sai plans with a rotation of 90 years 

 are divided into three periods of 30 years, of which only the 

 regeneration area is usually completely allotted. The number of 

 periodic blocks will naturally vary with the rotation and the 

 different broad age classes constituting the working circle. Thus 

 in the Chuka Working Circle of Pilibhit there is no difficulty 

 in allotting the entire working circle to 3 periods. 



Similarly, there is no necessity that the periodic blocks should 

 consist of continuous?compartments or of compartments forming 

 together one continuous mass of forest. Circumstances may 

 arise in which this arrangement of self-contained blocks follows 

 naturally as in the Chuka and Thano working circles of Pilibhit 

 and Dehra Dun divisions. As a rule however each compartment 

 will be allotted to its period entirely on its own merits without 

 reference to neighbouring compartments. The oldest crops will 

 naturally be allotted to periodic block no. I for regeneration 

 and the youngest to the last period. This allotment requires a 

 certain amount of give and take ; certain crops have to be regene- 

 rated out of their turn and provided the working plan officer makes 

 arrangements to equalise the . yield in the different periods and 

 exercises his professional knowledge and cpmmon sense in 

 the allotment of the regeneration area, nothing more can be 

 expected. 



