The last kind is the dulse of the Scotch, and the dillisk of the Irish. Mr. Harvey thus notices its edible peculiarities: “In Ireland and Scotland this plant is much used by the poor as a relish for their food. It is commonly dried, in its unwashed state, and eaten raw, the flavor being brought out by long chewing. On many parts of the west of England it forms the only addition to potatoes in the meals of the poorest class. The variety which grows on mussel shells between tide-marks is preferred, being less tough than other forms, and the minute mussel-shells and other small shell-fish which adhere to its folds are nowise unpleasing to the consumers of this simple luxury, who rather seem to enjoy the additional _goût_ imparted by the crunched mussels. In the Mediterranean this plant is used in a cooked form, entering into ragouts and made dishes; and it formed a chief ingredient in one of the soups recommended under the name of St. Patrick’s Soup by M. Soyer to the starving Irish peasantry.” It should be noticed that Dr. Harvey was keeper of the herbarium in the University of Dublin, and that he wrote in 1846. Another dark-red sea-weed, which is very iridescent, when waving under water at low spring tides, is also said to be eaten in Cornwall, but, Harvey says, more by women than men. It is called the Edible Iridæa from its rainbow colors, is about six inches in length, is gristly to the touch, and is rather like a battledore in shape. The supposed luxury which is served at the tables of many, and which is called laver in England, and sloke, sloak, or sloukawn in Ireland, comes from some sea-weeds which are delicately membranaceous, flat, and more or less purple. The color gives the name Porphyra, from the Greek word “porphuros,” purple. One kind is something like a large, crumpled lettuce-leaf in shape, without the veins and stalk, and the other, which is the commonest, has a long frond like a tangle, of one or two feet long; but there is no long stalk. The edges are crisped, and the end of the frond is rather sharp and long. It is very thin, glossy, and more or less of a vivid purple. It is abundant on rocks and stones between tide-marks on our British shores, and is an annual. There is a handsome sea-weed called Nitophyllum punctatum, “a shining leaf.” It is of a rose-red color, and its membranaceous frond has its edge cleft; it is veinless, or has irregular veins toward its base. The thin expansion is very delicate, and is characterized by the want of “nervures” or veins, and the presence of spots or tubercles immersed in it. These are large, oblong, and very general, and contain the spores. In other plants of the same kind the spots contain tetraspores. The root is from a small disk, and the fronds grow in small tufts from twelve to twenty inches in length. They are attached to other weeds at low-water mark; and are found on rocks down to fifteen fathoms. It is very abundant on the coast of Antrim, and all round the British coasts.