The 13th book continues the description of Anatolia. The greater part of the book is occupied with a dissertation on the Troad. Strabo had travelled over the country himself, but his great authority is Homer and Demetrius of Skepsis, the author of a work in twenty-six books, containing an historical and geographical commentary on that part of the second book of the Iliad, in which the forces of the Trojans are enumerated. A learned digression on the Leleges, Cilices, and Pelasgi, who preceded the Aeolians and Ionians in the occupation of the country, is principally taken from Menecrates and Demetrius of Skepsis. The description then turns to the interior, and the account of the Aeolian cities is probably due to Poseidonius. Throughout this book are evidences of great care and desire for accuracy. The 14th book continues with the remainder of Anatolia, and an account of the islands Samos, Chios, Rhodes, and Cyprus. The authorities followed are, on the whole, the same as in the previous book—Herodotus, Thucydides, Ephorus, Artemidorus, Eratosthenes, and Poseidonius; besides Pherecydes of Syros who wrote on the Ionian migration, and Anaximenes of Lampsacus, the author of a history in Greek of the Milesian colonies. For Caria, he had the historians of Alexander and an author named Philip, who wrote on the Leleges and Carians. For Cyprus he had Damastes and Eratosthenes. The 15th and 16th books contain a description of the second portion of Asia, namely, the southern or the other side of Taurus. In the 15th book, Strabo describes India and Persia, the latter in two chief divisions, viz. Ariana or East Persia, and Persis or West Persia. These countries Strabo never saw; his description, therefore, is founded on the authority of travellers and historians. The topography of India is meagre, and limited to a few towns and rivers; but his account of the people of the country is more copious, he being supplied with materials from the historians of Alexander and of the campaigns of Seleucus in India. He looks on Megasthenes, Onesicritus, Deimachus, and Cleitarchus as fabulous writers: but his confidence rests chiefly on Patrocles, Aristobulus (one of the companions and historians of Alexander), and Nearchus, the chief commander of Alexander’s fleet. Artemidorus and Nicolaus of Damascus are occasionally consulted. For Ariana or East Persia, he had for his principal authority Eratosthenes; and for Persia Proper, he had, besides the above authors, Herodotus, Xenophon, and Polycletus of Larissa, an historian of Alexander.