STATISTICS OF FIR STANDS IN THE JURA 



61 



(6) Same forest and working group but compartment 19 and fro7n 

 entirely natural regeneration; 100 years old, but 90 per cent fir and 10 per 

 cent spruce. 



Such yields seem incredibly high, and the larger number of trees and 

 the higher yield on the area naturally regenerated is especially note- 

 worthy. The fact remains that these yields were attained, within at 

 least 10 per cent, allowing for a possible 10 per cent error in estimate. 



(c) Pure spruce, 100 years old from natural regeneration on a compart- 

 ment in the forest of Ouhans (first Jura Plateau) ; altitude 2,300 feet. 



<* These conversions (a, 6, c, d) were made as follows : For lO'-inch trees 4 cubic meters 

 were counted to the 1,000 feet after 30 per cent subtracted for cordwood. In the other 

 diameter classes 3 cubic meters were counted to the 1,000 feet, after subtracting 20 per 

 cent for the cordwood in the 16 and 22 inch classes and only 10 per cent of the 28-inch 

 class. Two cords were considered equal to 1,000 board feet. 



