Liber ii. (1) _Optics_ or _Perspective_ (a version of the _De multiplicatione specierum_). _Inc._ ‘Ostensum quippe in principio hujus Compendii Philosophiae.’
MSS. Brit. Mus: Royal 7 F vii. p. 221 (sec. xiii), fragment, called ‘Quinta pars Compendii theologiae’; and Addit. 8786, fol. 2 (fragment).
[Cf. Bodl. Digby 183, fol. 49 (sec. xiv)?] See the references under _Tract. de multiplicatione specierum_.
(2) _Astronomy_, or, _De coelo et mundo_.
MSS. Oxford:--Bodl. Digby 76, f. 1 (sec. xiii), _Compendium Philosophiae_. _Inc._ ‘Prima igitur veritas circa corpora mundi est quod non est unum corpus continuum et unius nature.’ _Ibid._ fol. 36, _De corporibus coelestibus, sc. de zodiaco, sole, etc._ _Inc._ ‘Habito de corporibus mundi prout mundum absolute constituunt’ (cf. _Opus Minus_). Cf. Ashmole 393 I, f. 44 (sec. xv), ‘Veritates de magnitudine ... planetarum. Tractatus extractus de libris celi et mundi,’ etc. Also, Univ. Coll. 49, De corporibus coelestibus.
Paris:--Mazarine 3576, _De coelestibus_ (five chapters). _Inc._ ‘Prima igitur veritas.’
(3) _Gravity_, _Scientia ponderum de gravibus et levibus_.
Liber iii. (4) _Alchemy_, or, _De elementis_[1354].
Liber iv. _De vegetabilibus et generabilibus_[1355].
_Inc._ ‘Quoniam intencio principalis est innuere nobis vicia studii theologici que contracta sunt ex curiositate philosophie.’
MSS. Bodl.: Digby 190, fol. 86 b (sec. xiii-xiv). ‘Methaphisica fratris Rogeri ordinis Fratrum Minorum, de viciis contractis in studio theologie’ (25 lines).
Paris:--Bibl. Nat. 7440 (sec. xiv), fol. 38-40, fol. 25-32. ‘Incipit metaphysica Rogeri Baconis de ordine praedicatorum’ (fragment).
It is, however, probable that these MS. fragments ought to be referred to Bacon’s last work, the _Compendium Studii Theologiae_, rather than to the _Compendium Philosophiae_.
_Compendium studii theologiae_, Bacon’s last work, bears the date 1292 (‘usque ad hunc annum Domini 1292’). Extracts from it are printed by Charles, pp. 410-416. This work consisted of six parts or more.
Part ii. _Logic and grammar in reference to theology._
These two parts are extant (though not complete) in MS. British Museum, Royal F vii. pp. 153-161: there is a long gap between pp. 154 and 155.