The estuaries of rivers appeal strongly to an adventurous imagination. This appeal is not always a charm, for there are estuaries of a particularly dispiriting ugliness: lowlands, mud-flats, or perhaps barren sandhills without beauty of form or amenity of aspect, covered with a shabby and scanty vegetation conveying the impression of poverty and uselessness. Sometimes such an ugliness is merely a repulsive mask. A river whose estuary resembles a breach in a sand rampart may flow through a most fertile country. But all the estuaries of great rivers have their fascination, the attractiveness of an open portal. Water is friendly to man. The ocean, a part of Nature furthest removed in the unchangeableness and majesty of its might from the spirit of mankind, has ever been a friend to the enterprising nations of the earth. And of all the elements this is the one to which men have always been prone to trust themselves, as if its immensity held a reward as vast as itself.

From the offing the open estuary promises every possible fruition to adventurous hopes. That road open to enterprise and courage invites the explorer of coasts to new efforts towards the fulfilment of great expectations. The commander of the first Roman galley must have looked with an intense absorption upon the estuary of the Thames as he turned the beaked prow of his ship to the westward under the brow of the North Foreland. The estuary of the Thames is not beautiful; it has no noble features, no romantic grandeur of aspect, no smiling geniality; but it is wide open, spacious, inviting, hospitable at the first glance, with a strange air of mysteriousness which lingers about it to this very day. The navigation of his craft must have engrossed all the Roman’s attention in the calm of a summer’s day (he would choose his weather), when the single row of long sweeps (the galley would be a light one, not a trireme) could fall in easy cadence upon a sheet of water like plate-glass, reflecting faithfully the classic form of his vessel and the contour of the lonely shores close on his left hand. I assume he followed the land and passed through what is at present known as Margate Roads, groping his careful way along the hidden sandbanks, whose every tail and spit has its beacon or buoy nowadays. He must have been anxious, though no doubt he had collected beforehand on the shores of the Gauls a store of information from the talk of traders, adventurers, fishermen, s............