A Windfall Problem 321 



have carried down smaller ones which were growing close enough 

 to have interlacing root systems. By volume in both of these 

 types, 8 per cent of the total merchantable cedar is windfall, and 

 9 per cent by the number of trees. The amount of cedar wind- 

 fall on the whole tract is approximately 10 per cent of the mer- 

 chantable cedar. This amounts to 3 per cent of the total volume 

 of all species on the area. 



Tables were also constructed to give by types and for the 

 whole area the conditions of standing cedar and cedar windfall, 

 showing for each diameter class the number of trees and the 

 volume, and also the per cents of each by diameter classes, and 

 the per cent in each class that is windfall. For the whole area and 

 by types the cedar is in much the same condition as to defect, 

 so that the general average for cedar for all diameter classes is 

 about 8 per cent. 



From these tabulations the following relations appear. 



In the Douglas fir type, by number of standing cedar trees, 

 over 40 per cent is between 12" and 20", and the per cent de- 

 creases in the larger diameter classes, being a little over 10 per 

 cent from 32" to 50", and for trees between 92" and 100" but 

 0.2 per cent, whereas in the windfall approximately 40 per cent 

 occurs in trees 32" and 40", after which point the per cent drops 

 to less than 2 per cent in the next diameter class and rises to about 

 7 per cent for trees from 52" to 60" in diameter. No windfall 

 occurred in cedar above 60" d. b. h. in this type. For all cedar 

 by total number of standing trees and windfall, the per cents for 

 each diameter class are practically the same, as only 9 per cent 

 of the total cedar is in windfall. The greatest per cent of cedar 

 windfall in any one class is 25 per cent for trees 32" to 40", 

 after which there is a marked decrease followed by a slight rise 

 for trees 52" to 60" in diameter. On the other hand, 23 per cent 

 or nearly one quarter of the standing cedar by volume is in the 

 diameter class 52" to 60", and about the same amount, 23 per 

 cent, for the diameters 22" to 40" and in the classes 62" to 80". In 

 windfall, slightly over 50 per cent occurs in trees 32" to 40", and 

 25 per cent in trees between 52" and 60". Over 25 per cent of the 

 total volume in the trees from 32" to 40" is in windfall. 



In the cedar type, over 25 per cent by number of standing trees 

 is in diameter class 12" to 20" — and over 70 f>er cent between 12" 

 and 40". There is a decrease in per cent in the succeeding diame- 



