68 ALGERIA 



(c) price per quintal (220 pounds), (d) cost of collection per 

 quintal (220 pounds). Also an account of the trees ("Mises 

 en valeur") barked for the first time by (a) number of trees 

 and (b) cost per tree; secondary products such as tannin by 

 (a) amount and (b) price; remarks. These figures are considered 

 very important as a basis for future working plans. Since 1888 

 the collection and peeling of bark has been done by the govern- 

 ment by day labor. 



The working plan for the aleppo-pine forest of Takrouina 

 follows the same general outline used in working plans for cork 

 oak. In this forest the yield is also regulated by area with the 

 rotation of fellings, as follows: (a) Regeneration; (b) Thin- 

 nings in young sapling stands, 20 years old, which will probably 

 cost some outlay; (c) When the trees are large enough the 

 thinnings will be made by tapping to death the trees which 

 are marked for thinnings; (d) Tapping alive during the life of 

 the tree after it attains a proper size. 



The author of the working plan states : 



"An average tree of i metre (39 inches) in circumference 

 is thus 72 years old; one can therefore assume that the average 



T OO 



growth is - = 0.139 (0.547 inch) and that a tree of 80 years 



would be 80 times 0.0139 or i.n m. (43 inches). 



We have decided then to fix the exploitable age at 80 and 

 the size for the trees to be tapped at i metre (39 inches) of 

 circumference. We propose besides to fix the period for tapping 

 at 4 years, with an additional year for felling.' 7 



