[50]

Theophilus, Schedula diversarum Artium, I. 34; this work is frequently quoted in Chapter XV.

[51]

See Janitschek, Die künstlerische Ausstattung des Ada-Evangeliars und die Karolingische Buchmalerei; fol. Leipzig, 1889.

[52]

See Weidmann, Geschichte der Bibliothek von St Gallen, 8vo, St Gall, 1841.

[53]

See J. R. Rahn, Das Psalterium Aureum von St Gallen, ein Beitrag zur Geschichte der Karolingischen Miniaturmalerei, folio, St Gall, 1878.

[54]

An excellent edition with 72 facsimiles of Villard de Honecourt's Album or sketch-book was produced by Professor Willis, London, 1859; it is superior to the French edition issued by J. B. Lassus, Paris, 1858.