Sea-Weed.
Every portion of the earth seems covered with vegetation, except now and then some sandy desert. Even the rocks are covered with mosses; and we have heard of little red plants, that take root so thickly in snow-flakes, as to make a fall of snow seem like a shower of blood.
The bottom of the sea, too, is sown with myriads of plants. These are of many forms and many hues, but mostly of a green color: it is owing to the plants beneath the surface that the sea has such a verdant tinge. In some tropical portions of the sea, the marine plants are so thick as to obstruct the passage of ships; and some species are said to grow seven hundred feet in length!