Second and third class mail was used to insulate a new root cellar north of the house, the old root cellar having been dug by the former owner as a fallout shelter and never having been satisfactory as root cellar.  Once the new root cellar was heavily over-insulated and could use no more, Jubal told Duke to dump such mail as fill to check erosion in gullies; combined with a small amount of brush such mail compacted very nicely.