At the age of seven, Master Thomson was sent to a private school at Hanwell, whence, three years afterwards, he was transferred to the charge of the Rev. Mr. Wooley, at Middleton. After spending a short time there, he became a pupil of the Rev. Mr. Church, at Hampton, where he remained until he had nearly completed his sixteenth year. He then left school--his education, of course, being far from complete--and entered the service of his father's firm. It was determined that he should begin his mercantile career in the St. Petersburg branch, and in the summer of 1815 he was despatched to Russia. His fine manners and address, combined with the wealth and influence of the firm to which he was allied, obtained him access to the best society of St. Petersburg, where he spent more than two years. In the autumn of 1817, upon his recovery from a rather serious illness, it was thought desirable that he should spend the coming winter in a milder climate than that of St. Petersburg, and he returned to his native land. The next two or three years were spent in travelling on the Continent with other members of his family. He then entered the counting-house in London, where he spent about eighteen months. This brings us down to the year 1821. In the spring of that year he was admitted as a partner in the firm, and once more went out to St. Petersburg, where he again remained nearly two years. He then entered upon a somewhat prolonged tour through central and southern Russia, and across country to Vienna, where he spent the winter of 1823-4, and part of the following spring. Towards the end of April he set out for Paris, where his mother was confined by illness, and where she breathed her last almost immediately after her son's arrival. Mr. Thomson soon afterwards returned to London, where he settled down as one of the managing partners of the commercial establishment. In this capacity he displayed the same energy which subsequently distinguished his political and diplomatic career. He took a lively interest in the political questions of the day; more especially in those relating to commercial matters. He was a pronounced Liberal, and a strenuous advocate of free-trade. In the summer of 1825 advances were made to him to become the Liberal candidate for Dover at the next election. After due consideration he responded favourably to these advances, and was in due course returned by a considerable majority. One of his earliest votes in the House of Commons was in favour of free-trade. He soon became known as a ready and effective speaker, whose judgment on commercial questions was entitled to respect. His zeal for the principles of his party was also conspicuous, and when Earl Grey formed his Administration in November, 1830, the office of Vice-President of the Board of Trade, together with the Treasurership of the Navy, was offered to and accepted by Mr. Thomson. He was at the same time sworn in as a member of the Privy Council.