To Preserve Strawberries

To 1 pound strawberries, after they have been picked over, add 1 lb. clean sugar; put them in preserving kettle, over slow fire, until sugar is melted, then boil them precisely 25 minutes fast as possible; have jar ready and put fruit in boiling hot; jar should be heated before hot fruit is poured into it, otherwise it will break. Cover and seal jars immediately; set in a cool place.