11 is. New developments that increase the service life of wood or produce wood products with improved properties have been reported in the literature since the last review on the subject in October 1949. Included are reviews on investigations of preservative and fire-retardant treatments for wood, strength properties of wood, wood structures, and production and properties of plywood, laminated wood, and modified woods. Structural fiberboards are included for the first time. These are gaining rapidly in importance and shotv promise of being suitable for various chemical engineering uses.