Commercial thinning at a relatively young age will result in changes not only to log size but to wood quality as well. One important change in the thinnings will be the increased proportion of juvenile wood relative to mature wood. In western hemlock (Tsuga heterophylla (Raf.) Sarg.), where the difference in wood density between juvenile wood and mature wood is relatively large, a higher proportion of juvenile wood can result in reduced lumber strength and lower pulp yields. Another change will be seen after thinning in the remaining standing trees; late-release growth pattern changes in terms of grain. The present report summarizes the results of X-ray densitometric analysis of 50-year-old western hemlock trees thinned from 1656 and 956 stems/ha plots, and amabilis fir (Abies amabilis (Dougl.) Forbes) from the 956 stems/ha plot. Results were compared to old-growth reference data, and to a recently completed basic wood properties study of 90-year-old western hemlock (Jozsa et. al., 1997).