On Mediaeval History, Labberton's Atlas; also, Koeppen: in Ancient Geography, SMITH'S work, KIEPERT'S, Long's. On Physical Geography, GUYOT'S text-books; Vaughan's Connection between History and Physical Geography, in Contemp. Review, vol. v.; Hall's Methods of Studying History, etc., p. 201 seq., Encycl. Brit., Art. Geography. CHRONOLOGY. An exact method of establishing dates was slowly reached.