Periodical Literature. 325 



volumes determined for felled trees to be sold (fni). The par- 

 ticipation of the three size classes in the total volume is figured 

 percentically. The volume of the average tree is calculated. A 

 description of the character of the stand helps to bring out a 

 picture of the same. 



The increment is determined by comparing two inventories taken 

 at dififerent times, keeping count also of the material cut and 

 removed, and also of the addition of trees to the lowest size class 

 (passage a la futaie). The increment is figured separately for 

 each size class and from the same volume table {sv) in order to 

 make it comparable to the stock volume. We may find, e. g. first 

 inventory {v) stout trees: 85 trees with 317 sv, second inventory 

 after 5 years {v2), 115 trees with 452 sv; removal (w), 8 trees 

 with 30 sv; total {v2-{-n), 123 trees with volume 482 vs ; the trees 

 of VI increased in v2-\-n to 85 trees with 368 sv; 38 trees were 

 added with 113 sv, increment for the 5 years 51 for the whole 

 compartment, 13.8 per acre; annual increment 2.8; increment per 

 cent. 3.23. 



The same calculation is to be made for each size class. 

 The inventory shows to the judgment of the manager the size 

 class in which the fellings are desirable, but the cut is made with 

 reference to growth conditions, the vigorously growing trees are 

 favored, the poor and those that suppress good growth are re- 

 moved. Silvicultural considerations prevail, the whole area to be 

 cut through evenly. Every 5 to 10 years return to the same com- 

 partment; especially when the stand is too uniform, work for 

 differentation of sizes by initiating early regeneration and favor- 

 ing the vigorously growing stock. In old uniform stands, where 

 no pains will produce a proper selection stand, clear and plant. 

 All material felled is, of course, carefully booked, measured by the 

 same volume tables which are used for the inventory. At same 

 time the logs, etc., are also actually measured and this measure 

 booked in the "felling control book," and these measurements are 

 used as a correcting factor of the sv. 



The inventory, felling control and increment calculations for 

 each compartment are placed in a periodic table, whereby a view 

 of the forest conditions, a comparison of the production is facili- 

 tated and a statistical material is compactly brought together as in 

 no other method, from which the felling budget is to be deter- 

 mined. 



