• Erickson, Harvey D.
  College of Forest Resources, University of Washington, Seattle
  
• Arima, Tsuneo
  College of Forest Resources, University of Washington, Seattle
  

The same material was used as in Part I of this study. Fibril angle decreased with age from over 30 degrees to 7 degrees at about age 30. Accelerated growth by fertilization and thinning at about 20 years caused a slight increase in angle but only for a few years. The semilog correlation with age was very high, r = 0.96. Tracheid length was highly correlated with fibril angle, r = 0.94. Growth rate and percent latewood were minor causes of changes in fibril angle. Extractive content did not change significantly with plot treatments. Lignin percent was highest near the pith and decreased at about age 20; r was -0.94 for the controls using the log of age. Accelerated growth increased lingin compared to the control trees by about 0.7%. Holocellulose and alpha cellulose increased from the pith to about 30 years of age. Accelerated growth caused a small decrease of 0.9% for both constituents during the next 6 years compared to uniform-growth trees, then the differences became much less.