_Liber Bacon de sermone rei admirabilis, sive de retardatione senectutis._ _Inc._ ‘Intendo componere sermonem rei admirabilis domino meo fratri E, cujus vitam deus prolonget.’
MSS. Bodl.: E Musaeo 155, pp. 655-666; Digby 183, fol. 45 (sec. xiv exeuntis); Canonic. Miscell. 334, fol. 25-31.
_De universali regimine senum et seniorum._ _Inc._ ‘Summa regiminis senum universalis est hoc ut dicit Avicenna.’
Bodl.: Canon. Miscell. 334, fol. 18{ b}-21{ b}; 480 (_explicit_ fol. 16); and E Musaeo 155, p. 638.
_De graduacione medicinarum compositarum._ _Inc._ ‘Omnis forma inherens.’
MSS. Bodl. Canon. Misc. 334, fol. 32; 480; fol. 23{ b} (the author’s name is obliterated in the MS.).
_Tractatus de erroribus medicorum_[1358]. _Inc._ ‘Vulgus medicorum.’
MSS. Oxford: Bodl. Canon. Misc. 334, fol. 42; 480, fol. 30 (author’s name obliterated); E Musaeo 155, pp. 669-689. Corpus Ch. Coll. 127 (sec xv).
_Canones practici de medicinis compositis componendis_, ‘Cap. i. Extractum de libro septimo Serapionis qui est antidotarium suum et est theoricum capitulum.’ (13 chapters.) _Inc._ ‘Necesse est illi qui vult componere medicinas.’ ‘Explicit tractatus de compositione medicinarum per fratrem rugerium bacon editus.’
MS. Bodl. Canon. Misc. 480, fol. 38{ b}-47.
_De leone viridi_ (on the manufacture of mercury); only the summary by Raymund Gaufredi is extant. _Inc._ ‘Verbum abbreviatum.’
MSS. Brit. Mus.:--Sloane 692, f. 46 (sec. xv). Oxford:--Corpus Chr. Coll. 277. Printed at Frankfurt, 1603 (_Sanioris medicinae_, p. 264), &c.
A number of works on alchemy are attributed to Roger Bacon erroneously or without any probability.
_De consideratione quintae essentiae_; 3 books.
The author was a Franciscan who entered the Order at Toulouse[1359]. _Inc. opus._ ‘Dixit Salomon sapientie cap. vii. Deus dedit mihi.’
MSS. Bodl.: Canonic. Misc. 334, fol. 59{ b}. ‘Primus liber de consideracione quinte essencie omnium rerum transmutabilium. In nomine domini nostri Jhesu Christi. Incipit liber de famulatu philosophie ewangelio domini Jhesu Christi et pauperibus euangelicis viris Amen.’ Fol. 94{ b}, ‘Explicit liber quinte essencie secundum fratrem Rogerium Bacun de ordine minorum.’
Bodl. E Musaeo 155, pp. 431-507. ‘Explicit liber tertius de consideracione 5{ te} essencie secundum magistrum Rogerum Bacon, correctus et scriptus per Johannem Cokkes manibus suis propriis Oxon[1360].’