The text is illustrated with engravings showing walls and solid vault (firmament), with the whole apparatus of "fountains of the great deep," "windows of heaven," angels, and the mountain behind which the sun is drawn.

For reduction of one of them, see Peschel, Gesschichte der Erdkunds, p.

98; also article Maps, in Knight's Dictionary of Mechanics, New York, 1875.

For curious drawings showing Cosmas's scheme in a different way from that given by Montfaucon, see extracts from a Vatican codex of the ninth century in Garucci, Storia de l'Arte Christiana, vol.iii, pp.

70 et seq.