One reason is, that the carse of Stirling has been upheaved some twenty feet, and thereby more or less drained, since the time of the Romans. A fact patent and provable from Cramond (the old Roman port of Alaterna) up to Blair Drummond above Stirling, where whales’ skeletons, and bone tools by them, have been found in loam and peat, twenty feet above high-water mark. The alluvium of the fens, on the other hand, has very probably suffered a slight depression. But the main reason is, that the silt brought down by the fen rivers cannot, like that of the Forth and its neighbouring streams, get safe away to sea. From Flamborough Head, in Yorkshire, all down the Lincolnshire coast, the land is falling, falling for ever into the waves; and swept southward by tide and current, the debris turns into the Wash between Lincolnshire and Norfolk, there to repose, as in a quiet haven. Hence that vast labyrinth of banks between Lynn and Wisbeach, of mud inside, brought down by the fen rivers; but outside (contrary to the usual rule) of shifting sand, which has come inward from the sea, and prevents the mud’s escape—banks parted by narrow gullies, the delight of the gunner with his punt, haunted by million wild-fowl in winter, and in summer hazy steaming flats, beyond which the trees of Lincolnshire loom up, raised by refraction far above the horizon, while the masts and sails of distant vessels quiver, fantastically distorted and lengthened, sometimes even inverted, by a refraction like that which plays such tricks with ships and coasts in the Arctic seas. Along the top of the mud banks lounge the long black rows of seals, undistinguishable from their reflection in the still water below; distorted too, and magnified to the size of elephants. Long lines of sea-pies wing their way along at regular tide-hours, from or to the ocean. Now and then a skein of geese paddle hastily out of sight round a mud-cape; or a brown robber gull (generally Richardson’s _Skua_) raises a tumult of screams, by making a raid upon a party of honest white gulls, to frighten them into vomiting up their prey for his benefit; or a single cormorant flaps along, close to the water, towards his fishing ground. Even the fish are shy of haunting a bottom which shifts with every storm; and innumerable shrimps are almost the only product of the shallow barren sea: beside, all is silence and desolation, as of a world waiting to be made.