Of late years, however, it has become much deteriorated and is
beyond economical repair ; next summer the Light-house Board will
probably build an iron caisson filled with concrete adjacent to the
tower, to form a foundation for the fog-signal apparatus, after which
it will be a matter of little moment whether the construction-pier is
destroyed or not.
The searrock light-houses of the world are few in number; the
following is a list of all, including those already described : Eddy-
stone; Bell Rock; Bishop Rock (1853), off the Scilly Islands ; the
Small's Rocks, entrance to the British Channel; Hanois Rocks
(18G2), Island of Aldcrney; Barges d'OloDue (1861), west coast of
France; Wolf Rock (1869), off Land's End, England; Alguada



86 AyCJENT AND MODERN LICnT-UOUSES.
Reef (1805), Bay of Bengal; Great and Little Baises Light, oft the
coast of Ceylon; Minot's Ledge, Boston, and Spectacle Reef, Lake
IIuroD.
The examples selected show Bufficlently well the rarions difficulties
and dangers att«ndiiig this cUss of work, aad how they were over-




come in each case ; so it Is not considered necessary to give detailed
descriptions of every work of this kind.
