Periodical Literature 113 



per cent, averages about 2 per cent.; somewhat lower for highe-i 

 rotations, and higher for timberwood alone. The simple formula 



as 

 of Mantel for the felling budget based on actual stock, b = —, is 



1 



found quite satisfactory for timberwood of the three species, at 



least no fear of overcutting needs to be entertained, especially 



since the lower ageclasses are usually underestimated. But for 



pine, this per cent., even with tolerably normal ageclasses, leads 



to overcutting, the normal use per cent, lying below 1.6, and also 



with the other species if the old ageclasses are deficient. Here 



as 

 b = — would give better results. 

 cr 



These formulae presuppose that the stands are kept in tolerably 

 close crown cover till old age. If early thinning practice is applied 

 the stock is being decreased and the use per cent, must have a 

 rising tendency'', and the question arises how far this rise may go 

 without endangering sustained yield principles. 



While the direct use or the formula for budget determination is 

 not recommended, it furnishes at least a control of the budget. 

 Applied to actual stock imder usual conditions the budget should 

 for sustained yield management never exceed the product : actual 

 stock multiplied by use per cent. 



Crosse und Aufhau des Norntalvorrates im Hochwalde. Mitteilungen der 

 Schweizerischen Centralanstalt fur das forstliche Versuchswesen, XI, 1, 1914, 

 pp. 97-148. 



Giving an accoimt of the forest of Lyons 

 French visited by the International Forestry Con- 



F or est gress, Barbey points out the faulty manage- 



Management ment of the same from the economic point 

 of view. 

 The forest, located in Normandie, has an area of around 25,000 

 acres. It is a broadleaf forest of 54 per cent, beech, 18 per cent, 

 oak, 25 per cent, blue beech and 3 per cent, ash, and other hard- 

 woods. Reference is made to the magnificent streets and roads 

 laid through the forest. 



From 1669 to 1785 the primitive method of tire et aire, a seed 

 tree method, leaving 10 seed trees per acre was employed, a portion 

 in 90-year rotation, another in 60-year rotation for fuelwood. 



