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Published online by Cambridge University Press: 27 October 2009

1 See, e.g. Thomson, J. O., History of Ancient Geography, pp. 147 ffGoogle Scholar. (with a useful collection of the references); especially p. 149, n. 1.
2 See J. G. C. Anderson, ad loc, who refers to ‘the contrary tides and currents off the north-east of Scotland, against which even sailing ships can often make no way’; but who combines this with the Pytheas-mythology, and thus scarcely brings out the appositeness of Tacitus' phrase.