• McMillin, Charles W.
  Southern Forest Experiment Station, Forest Service, U.S. Department of Agriculture, Alexandria, La.
  

Fibril angles were greater for earlywood (avg. 33.4^o) than for latewood tracheids  (avg 26.9^o). For earlywood fibril angle did not differ between growth rates when the specific gravity was low (avg 33.3^o). When the specific gravity was high, wood of fast growth has a higher fibril angle (avg 35.1^o) than wood of slow growth (avg 32.0^o). No differences were detected between core, middle, and outer wood. In latewood tracheids, fibril angles were greater in corewood (avg 28.0^o) than in middle or outer woods (avg 26.3^o). For whole wood (a weighted average of earlywood and latewood), fibril angle averaged avg 30.7^o and was greater in corewood (avg 32.2^o) than in middle or outer wood (avg 29.9^o).