There is a whirlwind from southern Morrocco, the aajej, against which the fellahin defend themselves with knives. And there is the ghibli, which rolls and rolls and rolls and produces a rather strange nervous condition. And then there is the harmattan, a red wind, which mariners call the sea of darkness. And red sand from this wind has flown as far as the south coast of England, apparently producing showers so dense they were mistaken for blood.