PLATE 2 
A. —“ Interrupted” reproduction of noble fir on the west slope of Lookout Moun¬ 
tain. Note the clear-cut line between dense reproduction and grass areas. The 
u-year-old seedlings here shown average about 30,000 per acre, yet these dense patches 
are contiguous with areas absolutely barren of seedlings. The grass areas mark the 
extent of ground fire; the seedlings grow where ground fire did not work. Photo¬ 
graphed in Columbia National Forest, 1913. 
B. —The picture shows the method of measuring the height of the seedlings by 
means of a graduated stick which was used also in determining the width of the tran¬ 
sect, %% feet. A representative stand of noble- and silver-fir reproduction on the 
northeast slope of Lookout Mountain. Photographed in Columbia National Forest, 
1913- 
C. —A fire line cut through 18 inches of litter and duff, Foss River fire, September, 
1914, Snoqualmie National Forest. 
D. —This picture was taken just inside the fire line, about 15 feet from the upper pic¬ 
ture. At the time of the fire, September 2, the forest floor was very dry and the duff 
was completely consumed in many places. Many trees fell after the fire because of 
the exposure and burning of the roots. Reproduction does not occur on such areas 
except near seed trees. 
