and thought of the memorable day when Columbus’s ship first plunged her bows into the tangled ‘ocean meadow,’ and the sailors, naturally enough, were ready to mutiny, fearing hidden shoals, ignorant that they had four miles of blue water beneath their keel, and half recollecting old Greek and Phoenician legends of a weedy sea off the coast of Africa, where the vegetation stopped the ships and kept them entangled till all on board were starved.

Day after day we passed more and more of it, often in long processions, ranged in the direction of the wind; while, a few feet below the surface, here and there floated large fronds of a lettuce-like weed, seemingly an ulva, the bright green of which, as well as the rich orange hue of the sargasso, brought out by contrast the intense blue of the water.

Very remarkable, meanwhile, and unexpected, was the opacity and seeming solidity of the ocean when looked down on from the bows.  Whether sapphire under the sunlight, or all but black under the clouds, or laced and streaked with beads of foam, rising out of the nether darkness, it looks as if it could resist the hand; as if one might almost walk on it; so unlike any liquid, as seen near shore or inland, is this leaping, heaving plain, reminding one, by its innumerable conchoidal curves, not of water, not even of ice, but rather of obsidian.

After all we got little of the sargasso.  Only in a sailing ship, and in calms or light breezes, can its treasures be explored.  Twelve knots an hour is a pace sufficient to tear off the weed, as it is hauled alongside, all living things which are not rooted to it.  We got, therefore, no Crustacea; neither did we get a single specimen of the Calamaries, {8} which may be described as cuttlefish carrying hooks on their arms as well as suckers, the lingering descendants of a most ancient form, which existed at least as far back as the era of the shallow oolitic seas, x or y thousand years ago.  A tiny curled Spirorbis, a Lepraria, with its thousandfold cells, and a tiny polype belonging to the Campanularias, with a creeping stem, which sends up here and there a yellow-stalked bell, were all the parasites we saw.  But the sargasso itself is a curious instance of the fashion in which one form so often mimics another of a quite different family.  When fresh out of the water it resembles not a sea-weed so much as a sprig of some willow-leaved shrub, burdened with yellow berries, large and small; for every broken bit of it seems growing, and throwing out ever new berries and leaves—­ or what, for want of a better word, must be called leaves in a sea-weed.  For it must be remembered that the frond of a sea-weed is not merely leaf, but root also; that it not only breathes air, but feeds on water; and that even the so-called root by which a sea-weed holds to the rock is really only an anchor, holding mechanically to the stone, but not deriving, as the root of a land-plant would, any nourishment from it.  Therefore it is, that to grow while uprooted and floating, though impossible to most land plants, is easy enough to many sea-weeds, and especially to the sargasso.