Abstract
SUMMARY Determinations of the angle of surface grain relative to the pith and relative to the central axis were made on discs cut from thinnings in two clonal stands, nine years old. Unexpected variation was observed within each clone and even within any one disc. Nevertheless significant differences in mean angle of slope were found between these clones, at all heights, and an increase of mean angle was noted proceeding up the stems. No relationship was observed between slope of grain and eccentricity of cross-section. Such relationship as was noticed between slope of grain and diameter at breast height may be attributable to differential height growth. It is recommended that spiral grain should be assessed from complementary determinations on any opposite radii.
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