[Footnote 49: The original record of the geography and trade
of Russia is produced by the emperor Constantine
Porphyrogenitus, (de Administrat. Imperii, c. 2, p. 55, 56,
c. 9, p. 59 - 61, c. 13, p. 63 - 67, c. 37, p. 106, c. 42,
p. 112, 113,) and illustrated by the diligence of Bayer, (de
Geographia Russiae vicinarumque Regionum circiter A. C. 948,
in Comment. Academ. Petropol. tom. ix. p. 367 - 422, tom. x.
p. 371 - 421,) with the aid of the chronicles and traditions
of Russia, Scandinavia, &c.]