"There are within the limits of the metropolis at least five million human beings, each of whom has every day to be provided with food. The difference between the plenty of one class and the pittance of another is, no doubt, very marked; but taking the rich and the poor together, the quantity of food required is almost incredible. The necessity for large imports suggests horrid possibilities for some future siege of London! But as the trade and port of London have made its wealth, so they have also helped it to its present enormous dimensions; for though the country, by the railways, brings her share of London's sustenance, yet by far the larger proportion of it comes through the docks. Thus, frozen and living meat comes from the far colony of New Zealand, and also from the United States, Canada, the River Plate, and Australia; potatoes from Malta, Portugal, and Holland; tea from China and India; early vegetables from Madeira and the Canary Islands; spices from Ceylon; wines from France, Portugal, and Spain; oranges from all parts of the tropical globe, far cheaper often than our own home-grown fruits. The import of oranges, indeed, alone reaches a total of 800 or 900 millions yearly; that of raisins and currants some 12,000 tons; while other things are in proportion. The unloading of the ships is done by casual helpers, called "dockers" or "dock-labourers," a rough class of workmen living in and around Wapping, Rotherhithe, and Stepney. Their employment, though now paid at a fair rate for "unskilled" labour, is necessarily heavy while it lasts, and uncertain, causing often a hand-to-mouth existence, and leading to frequent "strikes."--(Darlington's _London and its Environs_.) The dock warehouses should be visited, if only to gain some idea of the enormous wealth of London. "These docks," says M. Taine, "are prodigious, overpowering; each of them is a vast port, and accommodates a multitude of three-masted vessels. There are ships everywhere, ships upon ships in rows ... for the most part they are leviathans, magnificent ... some of them hail from all parts of the world; this is the great trysting-place of the globe."