Lengths of longitudinal resin canals in Pinus taeda (loblolly pine) wood were determined by 1) peeling offthe bark and measuring the canals, visible as white lines along the surface, to the nearest mm, and 2) photographing aseries ofcross sections (4000) ofknown thickness with a movie camera, and sub sequently using a film editor and frame counter to ca1culate lengths. The values yielded by the. two methods were not significantly different and indicate that the less time-consuming method of peeling and measuring lengths is as reliable as the cinematographic technique.
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