KELP, an alkaline substance derived from the ashes of certain sea-weeds, yielding iodine, soda, potass, and certain oils; kelp-burning was formerly a valuable industry in Orkney and the Hebrides.

death on the sunken reef Where the jagged ledge is hid and the slimy seaweeds grow, And the long kelp streamers wave in the dark green depths below, Where, under the shell-clad hulk, the gaunt shark makes his lair, Toilers upon the sea, here is the reef!