A mist at sea, consisting of the grosser vapours floating in the air near the surface of the sea. The fog of the great bank of Newfoundland is caused by the near proximity of warm and cold waters. The air over the Gulf Stream, being warmer than that over the banks of Newfoundland, is capable of keeping much more moisture in invisible suspension; and when this air comes in contact with that above the cold water, it parts with some of its moisture, or rather holds it in visible suspension. There are also dry fogs, which are dust held in suspension, as the so-called African dust, which often partially obscures the sun, and reddens the sails of ships as they pass through the north-east trades.