"Sir Lewis is the principal mentor of the modern school of historiography in this country—a school that combines meticulous attention to the details of research with an acute grasp of what is significant in the interpretation of the past. Apart from the debt owed him by the many younger historians who have received their training at his hands, Sir Lewis is largely responsible for an important change in the British historical outlook: his volumes on the structure of eighteenth-century politics have revolutionized the traditional view of the relations between Crown, Administration and Parliament under the Georges."