90 



NATURAL REGENERATION 



another portion of the forest the marking illustrates the freedom and 

 flexibility of French silviculture. Here the cutting was the removal 

 of small groups of trees and the groups left were occasionally thinned. 

 Trees were left along roads and around a small mountain swamp. The 

 openings were rarely more than 33 to 49 feet in diameter and the groups 



Fig. 8. — Pure larcli at an altitude of .5,970 feet, in tlie communal forest of Tignes. 

 The stand totals 49 trees per acre and 4,5 cubic meters (11,000 feet board measure). 

 A selection felling has resulted in an open stand, because the ground (grass covered) 

 was not worked to assist regeneration. 



left were preferably on rocky ground and very steep slopes. The cutting 

 in one locality where conservatism was indicated by the steep slopes 

 removed, in a hght selection system, about 20 per cent of the stand. 

 An experiment was being tried out by cutting in strips running hori- 

 zontally around the slopes. The strips cut were about 100 feet in width 



