Dec. is, 1925 Yield Capacities ofYellov) Pine Type in California 1129 
of site classification adopted is not too bad, and that the values 
derived are at least relatively correct. 
An attempt to check results by means of the “site factor” advo¬ 
cated by Hanzlik 5 in Oregon and Washington was not particularly 
satisfactory. Whereas he apparently found equal intervals between 
Fig. 4.—Relation of height of average trees to mature height of dominants on age of dominants 
sites, figures in the present study show the factors varying in the same 
way as to yield, i. e., increasing from poor to good sites. 
& Hanzlik, E. J. the determination of site qualities for even-aged stands by means of a site 
factor Proc. Soc. Amer. Foresters 9: 229-234. 1914. 
