120 WELLS ON FOWLNESS ISLAND.
the interior diameters being 4 ft. 8 in. and 7 ft. respectively,
the exterior of the tubs 12 ft. and 14 ft. 4 in. The irrelevance of
these details in regard to wells in Fowlness was imperceptible
in 1725, but it is hardly necessary to point out that in an intra-
tidal area like Fowlness, where the sand below the surface-clay
is permanently charged with sea-water, the rainfall which dilutes
the contents of the ditches cannot in any way enhance the diffi-
culties of sinking wells through the sand.