These tips on storing cookies come from Cookies Galore (from Frances Barton of the General Foods Corporation, copyright 1956).
Store cookies in a refrigerator if they are the no-bake type. Store baked cookies in a tightly covered metal or earthenware container. To soften cookies, keep a piece of fresh apple in the cooky jar.
Best of all is the adorable photo tip: A cookie jar should have a tight lid, "but not so tight a small boy can't raid the jar." *wink*