In the following list of MSS, which is no doubt far from complete, I have attempted to distinguish between the _Philosophia_ and _Dragmaticon_ but have often had to rely only upon the notices in catalogues which frequently do not give the opening words or other distinguishing marks. The following MS seems unusual in apparently containing both versions, if by “eiusdem philosophia secunda” is indicated the _Dragmaticon_. CLM 564, 12th century, with figures, fol. 1-, Willelmi de Conchis philosophiae libri IV, fol. 32-, eiusdem philosophia secunda. _MSS of the Philosophia_ Egerton 935, 12th century, small quarto, Phylosophia Magistri Willihelmi de Conchis, cum figuris. Egerton 1984, 13th century, fols. 2-33. Royal 9-A-XIV, 14th century, fols. 245-65, Physicorum libri 4. Royal 13-A-XIV, #7, “Quoniam ut ait Tullius....” Additional 11676, 13th century, anon. de philosophia naturali, in three parts. Additional 26770, 13-14th century. Digby 104, 13th century, fol. 176-, De elementis philosophiae naturalis. University College 6, 14th century, p. 389, Philosophiae compendium, “Quoniam ut ait Tullius....” Bodleian (Bernard) 2596, #10, in four parts; 3623, #30, fol. 187v-; 4056, #1. BN 6656, 14th century, Philosophia, in four parts; 15025; 13th century; 16207, 13th century, fol. 58-. Ste. Geneviève 2200, anno 1277, fols. 1-47, with colored figures, “Quoniam ut ait Tullius....” Vienna 2376, 12th century, fols. 32v-64v, “Incipit prologus in phylosophyam Willehelmi. Quoniam ut ait Tullius....” Amplon. Octavo 85, 13th century; Octavo 87, mid 12th century! CLM 2594, 13th century, fol. 24, Compendium philosophie de naturis corporum celestium et terrenorum. Sunt libri IV. CLM 2655, late 13th century, fol. 106, “Summa de naturis videlicet totius philosophiae,” in fine nonnulla desunt. CLM 14156, 15th century, fols. 1-18, Philosophia minor. CLM 14689, 12th century, fols. 85-7. Wilhelmi Hirsaugiensis dialogus de astronomia, supersunt tria tantum folia. CLM 15407, 14th century, fols. 1-42, philosophia. CLM 16103, 12-13th century, fols. 68-99, philosophia naturalis. CLM 18918, 12th century, fols. 1-34, de philosophia. CLM 22292, 12-13th century, fol. 40, “Quoniam ut ait Tullius....” _MSS of the Dragmaticon_ CLM 2595, 13th century, 43 fols. Dragmaticus. CLM 7770, 14th century, 56 fols. De secunda philosophia. Florence II, VI, 2, 13th century, fols. 50-65, “Queris venerande dux....” Ashburnham (Florence) 98, 13th century, fols. 2-41. Bibl. Alex: (Rome) 102, 14-17th century, fols. 112-209. Wolfenbüttel 4610, 12-14th century, fols. 78-160v, Phisica Willendini, “Queris venerande dux....” Berlin 921, 13th century. Vienna 5292, 15th century, fols. 105-57, “Veros (_sic_) Venerande dux....” Vendôme 189, 13th century, fols. 123-59. St. John’s 178, early 13th century, fols. 266-360, anon., “Queris venerande dux....”