The father of the late Marquis of Londonderry was the first of the family who was ennobled. He was an active, intelligent, and successful man. Representing his county in two parliaments, and, acting with the government, he partook of that golden shower which naturally falls from the treasury. He became in succession the possessor of office and the possessor of title--baron, viscount, earl, and marquis--and wisely allied himself with English nobility, marrying, first, a daughter of the Earl of Hertford, and, secondly, a sister of Lord Camden. The subject of this memoir was a son of the first marriage, and was born in Ireland on the 18th of June 1769. From boyhood he was remarkable for coolness and intrepidity, and was said to have exhibited both qualities in saving a young companion in the lake of Strangford. At the age of seventeen he was entered of St John's College, Cambridge, where he seems to have applied himself actively to the general studies of the place--elementary mathematics, classics, logic, and moral philosophy. This sufficiently answers the subsequent taunts at the narrowness of his education. As his father had been a politician, his son and heir was naturally intended for political life. The first step of his ambition was a costly one. County elections in those days were formidable affairs. The Hillsborough family had formerly monopolised the county. Young Stewart was put forward, according to custom, as "the champion of independence." He gained but half the day, for the Hillsboroughs still retained one nominee. The young candidate became a member of parliament, but this step cost £60,000. The sacrifice was enormous, and perhaps, in our day, might startle the proudest rent-roll in England: but, seventy years ago, and in Ireland, the real expenditure was probably equivalent to £100,000 in our day. And it must have been still more distressing to the family, from the circumstance, that the sum had been accumulated to build a mansion; that the expense of the election also required the sale of a fine old collection of family portraits; and that the old lord was forced to spend the remainder of his life in what the biographer states to be an old barn, with a few rooms added. But his son was now launched on public life--that stream in which so many dashing swimmers sink, but in which talent, guided by caution, seldom fails to float along, until nature or weariness finishes the effort, and the man disappears, like all who went before.