Corncribs allowed corn to be, as someone has mentioned, stored at a higher moisture content than shelled corn. They were used at a time when most corn was picked on the ear. You've never really lived until you've dumped corn from a wagon into an elevator, filling a huge corn crip and then stood in the top of a nearly-full crib, holding a piect of corrugated tin, directing the flow of corn off the elevator into corners to finish filling the crib. We'd even put wire tunnels down the center of the drive-through in double cribs, then fill the driveway. Ah, those were the days.