104 PRACTICAL FOREST MANAGEMENT. 



"Hence the total yield of 47,000 acres = 320,775 units per annum, 

 or, say, 320,000 units in round figures for the whole working 

 circle. It is divided between the two felling series according to 

 the growing stock in each as follows : 

 East Felling Series = 146,300 units. . 

 West Felling Series =173,700 units. . 



The yield shown against each -felling series should be felled 

 annually, all sal and asaina of 8" diameter and over felled any- 

 where within the felling series will count against the yield. Sal 

 and asaina under 8" diameter and miscellaneous species will not 

 count against the yield. A balance account will be kept for each 

 felling series in the control forms and the surplus or deficit at the 

 end of each year will ba carried forward to the next year. A 

 deviation exceeding 10 per cent, of the yield of each felling series 

 will be a deviation if rom the prescriptions of this working plan and 

 will require the previous sanction of the Chief Conservator of 

 Forests. The figures of volume units per diameter class given in 

 the table above, which have been used in calculating this yield, will 

 of necessity be adopted by marking officers in marking or felling 

 against the prescribed yield. They have no connection with sawn 

 or utilisable output, butjone unit represents 10 c. ft. of timber 

 plus firewood." 



In the French method of 1883 and in La Methode du Controls 

 the proportion of the diameter classes in a normal forest would be 

 fixed as follows with an exploitable size of 24* diameter. 



The calculation of the yield employed in the Methode du 

 Controle is really based on the real C. A. I. of the growing stock 

 as determined at two subsequent enumerations. 

 la 4S " The basis of the whole method is a thorough study of the 



Methode diameter increment put on by trees during the whole of their lives 

 du 



Controle. " La Melhode du Controle Indian Foreder July, 1922. CHAMPION- 



