9. A peculiar appalling appearance in this bank, more particularly as if it were a solid wall, drawing down upon and closing around the ship. 10. A darting forward of portions of this bank, as if torn into rags and shreds by some violent force, and driven before, not borne, by the wind. When this indication is distinctly recognized, a run of about two hours toward the center will involve the vessel in a destructive hurricane. 11. A peculiar motion exhibited by small bodies, as branches of trees when agitated by the wind, consisting of an apparent whirling, not a bending forward, as if bent by a stream of air. 12. Lightning of a remarkable columnar character, shooting up in stalks from the horizon with a dull glare; also like flashes from a gun, and sparks from a flint and steel. METEOROLOGICAL SIGNS RECOGNIZED BY THE EAR. 1. A distant roar (probably of the hurricane itself) as of wind rushing through a hollow vault. 2. A peculiar moaning of the wind, indicative of the close proximity of the violent portion of the hurricane. THE METEOROLOGICAL PHENOMENA ACCOMPANYING A REVOLVING STORM MAY ALSO BE ENUMERATED THUS: 1. A very rapid motion of the air constituting the hurricane, and increasing in velocity as the center is approached. 2. A fitful variation of intensity in the force of the wind, which sometimes blows with fearful violence, carrying away everything that opposes its progress; then sinking to a gentle breeze, or even lulling to a calm, but almost immediately afterwards springing up with greater violence than before. The hurricane winds are nearly if not entirely, without exception, puffy, violent, and blowing in gusts. 3. An immense condensation of aqueous vapor, forming large banks of cloud, which precipitate torrents of rain. The condensation appears to be so exceedingly rapid that large quantities of electricity are generally developed, giving rise to incessant flashes of lightning. 4. A general darkness, and gloominess within the area of the cyclone, relieved only by the fitful glare of the lightning, or the appearance of the imperfect circle of light near the center or axis of the storm. 5. A separation of the clouds in or near the center of the hurricane, so as to produce in the immediate neighborhood of the axis a clear sky, through which the sun and stars are often seen with great brilliancy. 6. A calm in the center of the cyclone. INDICATIONS OF APPROACHING OR EXISTING HURRICANES, MANIFESTED BY THE OCEAN, OF ESPECIAL UTILITY TO VESSELS AT ANCHOR IN ROADSTEADS.