Two piezoelectric dispersions of wood below room temperature were considerably affected by moisture content. For the dispersion at about -100 degrees C, the temperature of the dispersion shifted toward higher temperature and the activation energy increased as moisture content increased. For the dispersion at about -25 degrees C, the temperature of the dispersion first shifted toward lower temperatures, and then in the moisture content range of about 4-6% shifted toward higher temperatures, then shifted back toward lower temperatures. That is, there was a peak in variation of dispersion temperature at approximately 6% moisture content. The variation of activation energy agreed with the variation of dispersion temperature. These piezoelectric dispersions seem to be attributable to rotation of CH2OH groups for -100 degrees C and to the local relaxation mode in molecular chain in the amorphous region for -25 degrees C. (Author abstract, modified)