It has been noticed that some sea-weeds are parasitic, or live on others, fixed certainly, but whether they get any nourishment through their roots is doubtful. One of these is very common on Fuci, the bladder one especially; and it occurs as dense little tufts on the leaves. These, when examined, are found to be made up of long, flaccid, olive-colored hair-like filaments, about an inch in length. They rise from a little hard spot, and form a tuft with a broad circular outline. They belong to a genus called Elachista, from the Greek word for “the least.” The hairy Ceramium is a tufty weed, which is sometimes parasitic and sometimes not. It has a very peculiar shape, being made up of filaments placed side by side in great numbers, but they branch and rebranch, have little whorls of minute prickles along them, and the ends curl gracefully. Among the more remarkable sea-weeds is the Carrageen, or Irish moss. It is a very variable plant in its color and shape, and it may be a yellowish-green, a livid purple, or of a brownish tint, and it may be in the shape of a wrinkled, crumpled fern, or of a bush. It has a root-stem, reaches a foot in height, and the largest are found in estuaries where mud comes down with fresh water. The weed is found abundantly on the shores of Great Britain, and formerly was used in the place of isinglass for making blanc-mange, an edible which has degenerated with the progress of imitative culinary art. It was a fashionable remedy for consumption, and many of the peasantry of the west coast of Ireland used to collect it. A most extraordinary fan-shaped sea-weed has a root covered with woolly filaments and fronds, from two to five inches in length, wide at the base, and expanding in almost perfect half-circles. The frond is curved, marked across, and has a disposition to form funnel-shaped pieces. A fringe of orange-colored filaments is on the markings, and at the edge, which is often strongly rolled inward. The outer surface is covered with a kind of whitish powder. The general color is yellow and olive, with a dash of red. This peacock-tail weed is found on rocks in shallow pools, on parts of the south of England coast, and is abundant at Torquay. It is remarkable for being an extension, northward, of a common tropical sea-weed.