A hundred miles from the city Acon to the great hill which is called Scala Trojae (leg. Tyriorum, Macc. XI, 59) the Ladder of the Tyrians, and there is a river beside the city of Acre, and a gravel-pit; and if all the gravel in it be taken out at night, it would not be the less on the morrow. And of it is made the best glass on earth, and men come by sea and land from far-off places for that gravel, and there is evermore great wind in that fosse that stirreth the gravel. And every metal on earth which is carried into that place to be melted turneth into glass, and the glass which is made of that gravel, when it is put again there, turneth (back) into gravel.