The Historia Troiae of Guido delle Colonne is made use of in Troilus and in the Legend of Good Women; and it is likely that Dares Phrygius and Dictys Cretensis were only known to Chaucer through the medium of Guido and of Benoist de Sainte-More. The Liber Consolationis et Consilii of Albertano of Brescia was most useful in supplying material for the Tale of Melibeus; which, however, was more immediately derived from the French version by Jean de Meun. Chaucer also knew something of the Liber de Amore Dei by the same author; and probably had read a third treatise of his, entitled De Arte Tacendi et Loquendi. Other books which drew his attention were the famous Gesta Romanorum; the Polycraticus of John of Salisbury; the Epistola Valerii ad Rufinum by Walter Map; the Liber Distichorum of Dionysius Cato, with the supplement entitled Facetus; and Albricus De Imaginibus Deorum. We also find casual allusions to the Aurora of Petrus de Riga; a poem by Martianus Capella; the Bestiary entitled Physiologus; the Burnellus of Nigellus Wireker; the Liber de Amore of Pamphilus Maurilianus; the Megacosmos of Bernardus Silvestris; the Nova Poetria of Geoffrey de Vinsauf; and the Speculum Historiale of Vincent of Beauvais. We need not include in the list authors such as Cassiodorus and Isidore of Seville, who are certainly quoted at second-hand. On the other hand, we must not forget the writers whom Chaucer consulted for special purposes, in connection with astrology and alchemy; such as, in the former case, Messahala, Ptolemy, Alchabitius, Almansor, Zael, and the aphorisms attributed to Hermes Trismegistus; and, in the latter case, the same Hermes, Jean de Meun, Arnoldus de Villa Nova, Senior Zadith, and others whose names do not expressly appear. Several authors are mentioned by name, with whose writings he was probably unacquainted; such as Alhazen, Averroes, Avicenna, Constantinus Afer, Dioscorides, Galen, Gatisden, Hippocrates, Rhasis, Rufus, and Vitellio; and we can see that some of these names were simply borrowed from Le Roman de la Rose. There is small reason to suppose that he knew more than the name of the huge work De Causa Dei by Thomas Bradwardine. As to Agathon, Corinnus, Lollius, and Zanzis, the suggestions already made in the notes upon the passages where these names occur contain, to the best of my belief, all that has hitherto been ascertained. * * * * * GLOSSARIAL INDEX. The references in this index are given according to the following scheme. Poems denoted by Arabic numerals are Minor Poems, as printed in vol. i. Thus, under 'A, _prep._ on,' the reference '3. 370' means Minor Poem no. 3, line 370, or l. 370 of the Book of the Duchesse. The letter 'R.' refers to the Romaunt of the Rose, Fragment A, in vol. i. pp. 93-164; the rest of the Poem, not being Chaucer's, is indexed separately. Thus 'R. 163' means l. 163 of the Romaunt.