During this period a vast empire was beginning to unfold itself in the East Indies, destined to produce a vast trade, and pour a perfect mine of wealth into Great Britain. The victories of Clive, Eyre Coote, and others, were telling on our commerce. During the early part of this period this effect was slow, and our exports to India and China up to 1741 did not average more than £148,000 per annum in value. Bullion, however, was exported to pay expenses and to purchase tea to an annual amount of upwards of half a million. Towards the end of this period, however, our exports to India and China amounted annually to more than half a million; and the necessity for the export of bullion had sunk to an annual demand for less than £100,000. The amount of tea imported from China during this period rose from about 140,000 pounds annually to nearly 3,000,000 pounds annually--an enormous increase. The progress of our manufactures was equally satisfactory. At the commencement of this period that great innovator and benefactor, the steam-engine, was produced. The idea thrown out by the Marquis of Worcester, in his "Century of Inventions," in 1663, had been neglected as mere wild theory till Savery, in 1698, constructed a steam-engine for draining mines. This received successive improvements from Newcomen and Crawley, and further ones from Brindley in 1756, and Watt extended these at the end of this period, though this mighty agent has received many improvements since. Navigable canals, also, date their introduction by the Duke of Bridgewater, under the management of Brindley, from the latter end of this period, 1758. Other great men, Arkwright, Compton, Hargreaves, etc., were now busily at work in developing machinery, and applying steam to it, which has revolutionised the system of manufacture throughout the world. In 1754 the Society of Arts and Manufactures was established.