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preface.8
The 3rd book commences with Iberia, and the subject of Europe is continued to the end of the 10th book. His references are the Periplus of Artemidorus, Polybius, and Poseidonius; all three of whom wrote as eye-witnesses. For descriptions and measurement of distances, Artemidorus is chiefly depended upon. The information possessed by Eratosthenes of these countries was meagre and uncertain. For the nations of southern Iberia, he adopts the account of Asclepiades of Myrlea, who had lived and been educated there. Some statements also are borrowed from Roman authors.
preface.8
The 4th book contains Gallia, according to the four divisions then existing, viz. Gallia Narbonensis, Acquitanensis, Lugdunensis, and the Belgae; also Britain, with Ierne, and Thule; and lastly, the Alps.
preface.8
Here Eratosthenes and Ephorus are of little service. His chief guide is Julius Caesar, whom he frequently quotes verbatim. Polybius is his guide for the Alps. Pytheas is the source of some scanty information respecting Ierne and Thule. Throughout his description he adds accounts obtained at Rome from travellers.
