You go down to any shore after a gale of wind, and pick up a few delicate little sea-ferns. You have two in your hand, which probably look to you, even under a good pocket magnifier, identical or nearly so. {37} But you are told to your surprise, that however like the dead horny polypidoms which you hold may be, the two species of animal which have formed them are at least as far apart in the scale of creation as a quadruped is from a fish. You see in some Musselburgh dredger’s boat the phosphorescent sea-pen (unknown in England), a living feather, of the look and consistency of a cock’s comb; or the still stranger sea-rush (_Virgularia mirabilis_), a spine a foot long, with hundreds of rosy flowerets arranged in half-rings round it from end to end; and you are told that these are the congeners of the great stony Venus’s fan which hangs in seamen’s cottages, brought home from the West Indies. And ere you have done wondering, you hear that all three are congeners of the ugly, shapeless, white “dead man’s hand,” which you may pick up after a storm on any shore. You have a beautiful madrepore or brain-stone on your mantel-piece, brought home from some Pacific coral-reef. You are to believe that its first cousins are the soft, slimy sea-anemones which you see expanding their living flowers in every rock-pool—bags of sea-water, without a trace of bone or stone. You must believe it; for in science, as in higher matters, he who will walk surely, must “walk by faith and not by sight.” These are but a few of the wonders which the classification of marine animals affords; and only drawn from one class of them, though almost as common among every other family of that submarine world whereof Spenser sang— “Oh, what an endless work have I in hand, To count the sea’s abundant progeny! Whose fruitful seed far passeth those in land, And also those which won in th’ azure sky, For much more earth to tell the stars on high, Albe they endless seem in estimation, Than to recount the sea’s posterity; So fertile be the flouds in generation, So huge their numbers, and so numberless their nation.”