180 Forestry Quarterly 



to danger of wind damage, since it is the purpose to leave the 

 stand in good condition for further growth without danger of 

 windfall. On the "medium" exposures, which include the 

 greater portion of the cutting area, there are left approximately 

 70 per cent of the trees 3 inches and over, 62 per cent 6 inches 

 and over, and 20 per cent 10 inches and over ; of the cubic foot 

 volume 44 per cent, and 36 per cent of the board measure volume 

 is left. A second cutting may be made in from 20 to 40 years. 

 A larger proportion of the stand is left on the "great" exposures 

 and less on the "safe." A negligible amount of windfall has 

 resulted from this method of cutting — probably less even than 

 with the former strip system. 



In both the clean-cut and selection cuttings it is the definite pol- 

 icy to allow the cutting of converter poles and lagging poles only 

 when they are obtainable from tops of marked trees or when it is 

 necessary to cut them in making roads, etc. The object of this 

 prohibition is to force the cutting of such material in young stands 

 badly in need of thinning. It is estimated that if all the lagging 

 and converter poles required by the local market each year were 

 secured in thinning over dense young stands, still only about one- 

 fourth of the areas in need of thinning annually would receive 

 attention. 



"Immature — converter pole" stands, from 80 to 120 years old, 

 and consisting mainly of trees under 8 inches in diameter suitable 

 for converter poles, receive an "improvement thinning." The 

 method of marking is to select on each square rod an average of 

 two (this is at the rate of 320 per acre) of the very largest and 

 most promising trees to be left. All other trees suitable for con- 

 verter poles are then cut, leaving all trees too small for this 

 purpose. 



"Immature — lagging pole" stands are usually from 50 to 80 

 years old ; most of the trees are under 6 inches in diameter. Here 

 also it is the purpose to make an "improvement thinning," reserv- 

 ing on each square rod about three (about 480 per acre) of the 

 most promising trees, and cutting all of the others suitable for 

 lagging poles. One 60-year-old stand cut in this manner had 

 2,044 trees per acre originally; 484 of the best trees were left 

 well distributed over the area, 1,022 poles were cut, and there 

 were left also 538 trees too small to interfere with the rapid 



