"Robinson Crusoe, as is well
known, built his house, from motives of health, on the south side of the
mountain, whereas his crops grew on the damp but fruitful northern slopes.
He was therefore obliged to carry his harvests over the mountain. To eliminate
this labour he decided to construct a canal around the mountain. The time
required for this enterprise which, to avoid silting, would have to be
continued without interruption, he estimated at three years. He had therefore
to lay in provisions for three years." (Gesell, A Story of Robinson