132 



APPENDIX 



DATA SERIES \I~iContinued) 

 Statistics of Sample Acre Plots in Pure Even-aged Stands of Douglas Fir 

 Data collected by the U. S. Forest Service, 1909 and 1911, in Western Washington and 

 Oregon.* 



SITE QUALITY II 



* This table includes all species on the acre plot except cedar. The latter is considered 

 an understory. Douglas fir is the predominating soecies, with scattering hemlock, firs, spruce, 

 pines and hardwoods. All trees to 2 inches D.B.H. are tallied by inch classes. 



Board measure based on trees 12 inches and over in diameter. 



