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Rh made himself famous by his measurement of the declination of the ecliptic, and by the calculation of the latitude of Marseilles. At the same time the merchants despatched another expedition to explore the African coast, under the direction of one Euthymes, another scientist of their city. Unhappily, the record of the voyage of this latter is lost; but the diary of Pythias, very carefully kept, has been preserved in part, quoted by early geographers who trusted him, and by Strabo, who poured scorn on his discoveries because they controverted his preconceived theories.

Pythias published his diary in two books, entitled The Circuit of the World and Commentaries concerning the Ocean. From the fragments that remain we can trace his course. Leaving Marseilles, he coasted round Spain to Brittany; from Brittany he struck Kent, and visited other parts of Britain; then from the Thames he travelled to the mouths of the Rhine, passed round Jutland, entered the Baltic, and went to the mouth of the Vistula; thence out of the Baltic and up the coast of Norway to the Arctic Circle; thence he struck west, and reached the Shetlands and the North of Scotland, and coasted round the British Isles till again he reached Armorica; and so to the estuary of the Garonne, whence he journeyed by land to Marseilles. Pythias remained for some time in Britain, the country to which, as he said, he paid more attention than to any other which he visited in the course of his travels; and he claimed to have investigated all the accessible parts of the Island, and to have traced the eastern side throughout. He arrived in Kent early in the summer, and remained there until harvest time, and he again returned after his voyage to the Arctic Circle. He says