The Memoirs of James, 2nd Earl Waldegrave (1715-63) rank with those of Horace Walpole and Lord Hervey as classics of eighteenth-century political literature. They have an additional significance as a record of the momentous political crisis of 1754-7, which heralded the break-up of the early Hanoverian party system and laid the foundations for the pattern of alignments of the last half of the century. Waldegrave's Memoirs, first published in 1821,...