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].’ Brit. Museum: Sloane 2320, f. 73 (sec. xv-xvi). Paris:--Bibl. Nat. 7151 (xv). Venice:--St. Mark, vol. IV. CI. XIV., Cod. 39. _De expulsione veneni._ _Inc._ ‘Ista subscripta sequerentur post capitulum de hiis que expellunt venenum.’ MS. Bodl. E Musaeo 155, p. 507 (not expressly ascribed to Bacon in the MS.: see Brewer, _Op. Ined._ p. xl.). _Speculum alchemiae._ _Inc._ ‘Multifariam multisque modis.’ MSS. Brit. Museum: Addit. 8786, f. 62; 15,549; Sloane 3506 (English translation). Bodl.: Ashmole 1416, f. 101 (sec. xv). Printed in Zetzner’s _Theatrum Chemicum_, vol. ii., A. D. 1659; in Manget’s _Theasurus_, vol. i., &c., &c. _Speculum alchemiae._ _Inc._ ‘Speculum alchemiae quod in corde meo figuravi.’ MS. Brit. Mus.: Harl. 3528, fol. 185. _Speculum secretorum_, or, _Liber secretorum_. _Inc._ ‘In nomine Domini ... ad instructionem multorum circa hanc artem.’ MSS. Brit. Mus.: Sloane 513, f. 178{b} (sec. xv). Oxford:--Bodl.: Digby 28, f. 61 (sec. xiv); Digby 119, f. 90{b}; Ashmole 1467, f. 208{b}, and 1485, p. 117 (sec. xvi). Also Corpus Christi Coll. 125, f. 86. Printed at Frankfurt, 1603 (p. 387). _Secretum secretorum naturae de laude lapidis Philosophorum._ _Inc._ ‘Secretum secretorum naturae audiant secreti quae loquor.’ Printed at Frankfurt, 1603 (pp. 285-291). _Rogerina major et minor_, two medical treatises; neither by Bacon: one is by a Roger Baron. MSS. Bodl. 2626; Cf. MS. St. Omer 624 (sec. xiii); Charles, _R. Bacon_, p. 75, _note_. Cambridge, Publ. Libr. Ii, I. 16 (sec. xiv) and Ee, II. 20. Brit. Mus.: Sloane 342, f. 146 (sec. xiii). _De Magnete._ _Inc._ ‘Amicorum intime, quamdam magnetis lapidis.’ MS. Bodl. E Musaeo 155, pp. 414-426 (anon.): Charles (p. 18) ascribes it to Peter de Maricourt. _Calendar_, wrongly attributed to Bacon; made by a Minorite at Toledo 1297, and extracted from the _Tabulae Toletanae_. MS. Cott. Vesp. A. II. f. 2; Cf. _Opus Majus_ p. 140 (ed. Venet, 1750). _Semita recta alchemiae_ (or, _Liber duodecim aquarum_). MS. Brit. Mus.: Sloane 513, f. 181{b}-188{b} (sec. xv): ‘Explicit semita recta alkemie secundum Magistrum Rogerum Bakun.’ Cf. MS. Sloane 276, f. 21, an anonymous work on the same subject, differing somewhat from the above.