Wherever and whenever it occurs, fog is a source of danger from which neither prudence nor skill can guarantee immunity: and whether the ship is slowed down or going at full speed, there is cause for fear while this gray blindness baffles the eyes. With plenty of sea-room the danger is least, and it increases near land, especially where the coast is wild and broken, like that of Ireland and Wales, and where there are many vessels as well as rocks to be passed. Probably the captain dreads but one thing more than a fog which comes down when he is making land. When he can see the familiar lights and promontories, he can verify the position of the ship and check his daily observations of the sun. Then it is plain sailing into port. But when the strongest light is quenched and every well-known landmark is hidden, and he has to feel his way with only the compass and the sounding machine to guide him, the consciousness that a slight divergence from the proper course may lead to disaster, keeps him on the pins and needles of anxiety, and sears his brain to constant wakefulness, as with a branding-iron. [Illustration: Out of Reckoning.—A Narrow Escape.] A startling experience may be recalled: The ship had swept down from the “nor’ard” like an arrow following the curve of its own bow, and it was promised that we should see land early in the afternoon and reach Queenstown soon after sundown. The weather could not have been better; it was clear and mild, and the air, the water, and the sky were tinged with the silvery pinks and grays which often appear, like mother-of-pearl, in the atmospheric effects of that southern coast. Flocks of birds were resting on the surface of the calm sea and wheeling around the ship, the gulls swinging within arm’s length of the passengers leaning against the rail. We steamed in among a fleet of fishing-boats with red sails—close enough to hear the greetings of the men, and these voices made the assurance of land doubly sure. Then it was whispered that land could be seen, and the searchers swept the eastern horizon with their glasses to find it. They made many mistakes about it, and explored the clouds, deluding themselves with the idea that forms of rosy vapor were the Kerry Mountains. They insisted upon it, but presently the coast defined itself to a certainty, coming out of the distance in bold masses of peak and precipice, fringed with a line of surf.