On the right hand and the left were wide stretches of muddy grey salt water, banks of sand, and drain-piped foreshore merging in patches of potato and swede and yellow squares of unripe corn. Clusters of white dots, where shingle and sea-walls bordered the drab, restless water, were fishing hamlets, villages and little coal-port towns. Upon the north bank, rapidly receding in distance, could be dimly sensed, beyond a dense fringe of masts standing close as pins in rows upon a pincushion, the oblongs and squares and rectilinears of docks and shipyards, stone quays, and piers and tide-basins, mixed up with blocks and streets of sheds and warehouses, stations and goods-yards, and huge, many windowed factories, whose towering chimneys yet belched forth thick black smoke-gouts, licked by red tongues of flame. Though even if the Saturday noon steam-siren had not silenced the throbbing of pneumatic rivetting-hammers and the roaring of steam coal-shoots, hydraulic grain dischargers and oil-pumps, and all the hellish hubbub accompanying the huge export and import trade of Yorkshire and Lancashire with North Europe and the Continent, these sounds would not have reached the ears of the boy in the aëroplane save as a dull and muffled murmur, vaguely sensed, through the musical moaning of the stay-wires and the racket of the tractor-screw. Now the sunset was behind. The land was rushing back upon the right and left-hand. The two-mile-wide river was broadening to a great estuary, vaster than the Thames, between Fort Victoria and Shoeburyness. Long crawling strings of linked-up barges, sailing vessels of the old windjammer type and yachts of the latest rig, battered tramp and collier steamers, high-sided rusty looking oil-tankers, pilot-cutters, coastguard motor-launches, whole fleets of steam-trawlers, thrashed up and down its broad south side fairways or cannily negotiated the treacherous channels of the north bank. Ocean-going giants of the Merchant Service, flaunting the White Bordered Jack, or the Red Duster, or under Admiralty Warrant, displaying the Blue Ensign. Behemoths of the North Sea passenger-service showing the three-striped merchant-flag of Germany—or the tricolour of the Netherlands, or the Crosses of Norway, Sweden and Denmark—with more rarely some big grey armoured cruiser upon harbour and Coastal Defence Service, or a brace of stumpy, square-ended patrol-boats, or a trio of the stinging black hornets we have learnt to call torpedo-boat destroyers, ranging in company upon some business of the Powers that order Britannia’s naval affairs.