With regard to the marine Plants which grow upon the Bell Rock, we may observe that the lower parts of it are covered with the stronger or larger sorts, as the great tangle, _Fucus digitatus_, the roots of which rarely appear above the water, while it is seen at the depth of several fathoms, growing with the greatest luxuriance, and has often been observed by the author from a boat in fine weather, as a means for ascertaining, by the direction of the leaf, the changes of the currents of the tide at the bottom. The Badderlock, or Henware, _Fucus esculentus_, is found only on the north-eastern and south-eastern extremities of the Rock, growing at low water-mark of spring-tides, and seems to prefer the most rapid currents of the sea, and places where the heaviest breach takes place. In such situations it grows in great abundance at the Bell Rock, where it has been measured of the length of eighteen feet, and of proportionally increased breadth. Perhaps some of these plants are of considerable age; but at the works of the Carr Rock Beacon, off Fifeness, it was found that the growth of the badderlock was so very rapid, that the plant attained to the length of seven feet upon the new building, in the course of the winter and spring months. The higher parts of the Bell Rock abound with the smaller fuci, as _Fucus mamillosus_, and _F. palmatus_, or common dulse. _F. lycopodiodes_, _alatus_, and _coccineus_, are found on the older stalks of the great tangle, and _F. subfuscus_ and _confervoides_ occupy the smaller pools. In some places, the rocks are rendered slippery with _Ulva compressa_ and _umbilicalis_; and the higher parts of the Rock, and the basement or lower courses of the light-house, are so covered with _Conferva rupestris_, as to produce the appearance of a sward of grass. [Sidenote: Animals.] Of the feathered tribe of animals at the Bell Rock, we notice the shag, cormorant, and herring-gull, which sometimes rest upon the Rock when in search of codlings and other small fishes. It also formed the resting-place of numerous seals at the commencement of the operations of the Light-house, but these amphibious animals, as well as the birds, have now almost entirely left it. The common crab and lobster are sometimes found here in the crevices of the rock. The _Lepas balanoides_, or acorn-shell, the common limpet, mussels of a small size, and the white _buckey_ or _Buccinum lapillus_, abound on the rock. The _Actinia crassicornis_, _Asterias glacialis_ and _oculata_, are common. A minute crustaceous insect, called, by Dr Leach, _Limnoria terebrans_ (_Lin. Trans_, vol. XI. p. 371.), appeared in great numbers in the submersed wood work of the temporary erections on the Rock. [Sidenote: Insect destructive to Timber.]