Elsewhere on the island men did the work of the city; here they did the work of the world. Each room in these endless mazes of buildings was a cell in a mighty brain; the telephone wires were nerves, and by the whole huge organism the thinking and willing of a continent were done. It was a noisy place to the physical ear; but to the ear of the mind it roared with the roaring of a thousand Niagaras. Here was the Stock Exchange, where the scales of trade were held before the eyes of the country. Here was the clearing-house, where hundreds of millions of dollars were exchanged every day. Here were the great banks, the reservoirs into which the streams of the country's wealth were poured. Here were the brains of the great railroad systems, of the telegraph and telephone systems, of mines and mills and factories. Here were the centres of the country's trade; in one place the shipping trade, in another the jewellery trade, the grocery trade, the leather trade. A little farther up town was the clothing district, where one might see the signs of more Hebrews than all Jerusalem had ever held; in yet other districts were the newspaper offices, and the centre of the magazine and book-publishing business of the whole country. One might climb to the top of one of the great "sky-scrapers," and gaze down upon a wilderness of houses, with roofs as innumerable as tree-tops, and people looking like tiny insects below. Or one might go out into the harbour late upon a winter afternoon, and see it as a city of a million lights, rising like an incantation from the sea. Round about it was an unbroken ring of docks, with ferry-boats and tugs darting everywhere, and vessels which had come from every port in the world, emptying their cargoes into the huge maw of the Metropolis.