We have in the form and habits of the _Phocidae_, or earless seals, a sufficient interpretation of almost every incident of the kind that has occurred north of the Equator--of those in which protuberant _mammae_ are described, we must presently seek another explanation. The round, plump, expressive face of a seal, the beautiful, limpid eyes, the hand-like fore-paws, the sleek body, tapering towards the flattened hinder fins, which are directed backwards, and spread out in the form of a broad fin, like the tail of a fish, might well give the idea of an animal having the anterior part of its body human and the posterior half piscine. In the habits of the seals, also, we may trace those of the supposed mermaid, and the more easily the better we are acquainted with them. All seals are fond of leaving the water frequently. They always select the flattest and most shelving rocks which have been covered at high tide, and prefer those that are separated from the mainland. They generally go ashore at half-tide, and invariably lie with their heads towards the water, and seldom more than a yard or two from it. There they will often remain, if undisturbed, for six hours; that is, until the returning tide floats them off the rock. As for the sweet melody, "so melting soft," that must depend much on the ear and musical taste of the listener. I have never heard a seal utter any vocal sounds but a porcine grunt, a plaintive moan, and a pitiful whine. But another habit of the seals has, probably more than anything else, caused them to be mistaken for semi-human beings--namely, that of poising themselves upright in the water with the head and the upper third part of the body above the surface. One calm sunny morning in August, 1881, a fine schooner-yacht, on board of which I was a guest, was slowly gliding out of the mouth of the river Maas, past the Hook of Holland, into the North Sea, when a seal rose just ahead of us, and assumed the attitude above described. It waited whilst we passed it, inspecting us apparently with the greatest interest; then dived, swam in the direction in which we were sailing, so as to intercept our course, and came up again, sitting upright as before. This it repeated three times, and so easily might it have been taken for a mermaid, that one of the party, who was called on deck to see it, thought, at first, that it was a boy who had swam off from the shore to the vessel on a begging expedition. Laing, in his account of a voyage to the North, mentions having seen a seal under similar circumstances.