SPECIFIC-GRAVITY AND CHEMICAL-PROPERTIES OF COMMERCIAL THINNINGS FROM6 SOFTWOOD SPECIES

The specific gravities of 17-to 26-year-old plantation-grown black, No rway, red and white spruce,jack pine and tamarack from New Brunswick t ended to be lower than those normally expected for mature wood of the same species. Moisture contents were in excess of 50% (green wood basi s). Extractives contents and one-percent caustic solubilities were equ ivalent to or lower than those from mature wood of the same species. K lason lignin contents ranged from 27.2 to 28.5%.