482 Forestry Quarterly. 



After discussing some of the inconsist- 



Yield cncies in the method of yield regulation in 



of Conifers France, M. Hatt cites some silver fir- 



in France. norway spruce growth per cent figures for 



Silver fir and Norway spruce which are extremely significant. 



These are summarized as follows : On "gres vosgien" soil, with 



a rotation of 135 to 144 years, the average production during the 



past ten years was 80 cubic meters per hectare (1145 cubic feet 



per acre) or a growth per cent of 25; in stands partly on "gres 



vosgien" and partly on "gres bigarre" soil the production was 



also 80 cubic meters per hectare for 10 years, or 27 per cent. In 



the second case, the rotation was 144 to 150 years. On granite 



soil with a rotation of 144 years the production was 70 cubic 



meters for 10 years, (1000 cubic feet per acre) making 21 per 



cent. 



T. S. W. JR. 



Revue des Eaux et Forets, April 15, 1914, pp. 254-257. 



UTILIZATION, MARKET AND TECHNOLOGY. 



Two well guyed trees or gin poles, one 

 Log-Loading on each side of the track and 200 to 400 



Device feet from it, have a li inch cable stretched 



tight between them 40 to 60 feet above 

 ground. A special carriage that can be racked in either direction 

 at the speed of about 800 feet per minute, rides this line. The 

 lifting line and this carriage are operated by a 3-drum, 4-cylinder 

 loader. The lifting line, handled by the lower drum, is fastened 

 as a tail-hold to one of the guyed trees and then passes through 

 the two lower sheaves of the carriage, looping down to a special 

 block in the bite of this line. This gives the engine a block 

 purchase on the log. The lifting and racking lines are handled 

 independently. The advantages of this system are : ( i ) no roll- 

 way or landing place is needed; (2) the landing is never blocked 

 up, for the logs can be delivered by the yarder anywhere between 

 the track and the guyed tree 400 feet away; (3) any log can be 

 picked up to make up a load; (4) timbers 160 feet long are 

 handled; (5) it is a safer system than any of the old ways; (6) 



