_De termino Paschali_, an earlier work, to which Bacon refers in the _Computus naturalium_; (Charles, p. 78). _Questions on Aristotle’s physics._ MS. Amiens 406, f. 1-25; cf. MS. Bodl. Digby 150, fol. 42 (sec. xiii), ‘Summa Baconis.’ _Quaestiones super librum physicorum a magistro dicto Bacon._ MS. Amiens 406, fol. 26-73. _De vegetabilibus_ (gloss on this work then attributed to Aristotle). MS. Amiens 406 (intercalated in the preceding work). _In Aristotelis Metaphysica._ MS. Amiens 406, fol. 74. _Tractatus ad declaranda quaedam obscure dicta in libro Secreti Secretorum Aristotelis._ _Inc._ ‘Propter multa in hoc libro contenta qui liber dicitur Secretum Secretorum Aristotelis sive liber de regimine principum.’ MS. Bodl.: Tanner 116, fol. 1 (sec. xiii exeuntis); the same MS. fol. 16, contains Aristotle’s supposititious _Secretum Secretorum_ ‘cum glossa interlineari et notis Rogeri Bacon.’ _Questiones naturales mathematice astronomice_, &c. ‘Expliciunt reprobationes Rogeri Baconis.’ MS. Paris:--Bibl. Nat. 16089, f. 93 (sec. xiii-xiv). _Bacon in Meteora._ _Inc._ ‘Cum ad noticiam impressionum habendam.’ MS. Bodleian: Digby 190, fol. 38 (sec. xiv ineuntis). _Processus fratris Rogeri Bacon ... de invencione cogitacionis_ (astrological fragment). _Inc._ ‘Notandum quod in omni judicio quatuor sunt inquirenda, scil. natura planetae.’ MS. Bodl.: Digby 72, fol. 49 b, 50 (sec. xiv-xv). _De somno et vigilia._ MSS. Bodl.: Digby 190, f. 77: _Inc._ ‘De somno et vigilia pertractantes, Perypateticorum sentenciam potissime sequemur.’ Cambridge:--Publ. Library Ii, vi. 5, fol. 85 b-88 (sec. xiii). _Inc._ ‘Sompnus ergo et vigilia describuntur multis modis.’ Logic:-- _Summulae Dialectices_, an elementary treatise on logic, characterised by Charles, who expresses a doubt as to its authenticity, as very dry, unimportant, and intended for lecturing purposes. _Inc._ ‘Introductio est brevis et apta demonstratio.’ ‘Expliciunt sumule magistri Roberti (_sic_) Baccun.’ MS. Bodl.: Digby 205, f. 48 (sec. xiv). _Syncategoremata._ _Inc._ ‘Partium orationis quaedam sunt declinabiles.’ MS. Bodl.: Digby 204, fol. 88 (sec. xiv). _Summa de sophismatibus et distinctionibus._ _Inc._ ‘Potest queri de difficultatibus accidentibus.’ MS. Bodl.: Digby 67, fol. 117 (sec. xiii); fragment. _Tractatus de signis logicalibus._ _Inc._ ‘Signum est in predicamento relationis.’ MS. Bodl.: Digby 55, fol. 228 (sec. xiii). _Opus Majus_, written A. D. 1266-1267; 7 parts. _Inc._ ‘Sapientiae perfecta consideratio consistit in duobus.’ MSS. of the whole work: Oxford:--Bodl. Digby 235 (sec. xv and xiv). Dublin:--Trinity Coll. 81 (= 221); a transcript of this is in Trinity Coll. Cambridge. Paris:--Bibl. Mazarine 3488 (sec. xviii). Rome:--Vatican 4086 (Montfaucon’s Catal. p. 114), ‘Rogerii Baconi causae universales in septem partes distinctae’; probably the _Opus Majus_.