Parchment, I+240+I^a f. (the modern foliation in pencil, used here, differs from the old one from f. 57 onwards as follows: new f. 57-232 = old f. 65-240 and new 233-240 = old f. 265-272), several hands, one of which copied f. 85r-91v, 167v-201v, 209r-215r and 227r-231v; and another f. 92r-118v and 143r-167r.

Astrology, astronomy and various: table of contents drawn up in 1471 by the librarian of the convent San Marco named Leonardo (Ir and I^ar, ed. Björnbo, 62-63); Albumasar, Introductorium maius, tr. Hermann of Carinthia, I-VII.9 (1r-54vb); Adelard of Bath, De opere astrolapsus, beginning missing ‘Incipit tractatus de spera solida. A phisicis spera gestibilis ad exemplum composita…’ (57ra-64rb); Seneca, Epistolae and other texts (65r-84v); Avicenna, De mineralibus (85r-86v); Pseudo-Aristotle, De celo et mundo (86v-90v); Ptolemaica (91r-118v); Aomar, De nativitatibus (119r-140v); eclipse predictions 1287-1300 (140v-141r); Gerlandus, Computus (141v-142v); Alfraganus, De scientia astrorum, tr. John of Seville (143r-167r); Adelard of Bath (?), ‘Liber de diversis speciebus astralabiorum et earum… Astrolabiorum igitur sex sunt species…’ (167v-168r); canons of Toledan tables (169r-184v); Prophatius Judeus, Quadrans novus (185r-188v, version dated 1290); Pseudo-Messahallah, De compositione astrolabii (189r-208v); ‘Liber de eclipsi Solis et Lune. Cum annos Arabum et menses et per consequens…’ (209r-214r, with table f. 215r); ‘Ad sciendum in quolibet mense anni an possit fieri eclipsis Solis vel Lune…’ (216r-226v); ‘Circulorum alius est sub quo, alius in quo, alius quo planete circumferuntur…’ (227ra-231va); ‘Descriptiones climatum et mutationes horologiorum…’ (232ra); end of an unidentified astrological texts ‘… forte proprietatibus et talibus nominantur. Explicit de pluviis et granderibus (!)’ (233r); Messahallah, Epistola de rebus eclipsium (233ra-236ra); ‘Cognitio temporum precipua. Scito quod figura planetarum levium…’, incomplete (236ra-240vb). According to the table of contents (f. Ir and I^ar), eight folia are now missing between current 54 and 55 (old f. 57-64), which contained Peter Peregrinus of Maricourt's De magnete (old f. 57-) and Robert Grosseteste's (?) De impressionibus aeris, wrongly identified with Book III of Pseudo-John of Seville’s Epitome totius astrologie (old f. 60-), and 14 folia are missing between current f. 232 and 233 (old f. 241-264), which contained Zael's Liber iudiciorum (old f. 241-) and Pseudo-John of Seville's Epitome totius astrologie (old f. 250-). Blank: 55r-56v, 64v, 168v, 214v, 215v, 232v.

Bibl. Inventario dei MSS dei Conventi Soppressi (handwritten inventory), 32; Aristoteles Latinus. Codices: L. Minio-Paluello, Pars posterior, Cambridge, 1955, 961 (no. 1403); A. A. Björnbo, Die mathematischen S. Marcohandschriften in Florenz. Nuova edizione a cura di Gian Carlo Garfagnini con una premessa di Eugenio Garin, Pisa, 1976, 61-69 and 128-130; P. O. Kristeller, Iter Italicum, V, London-Leiden, 1990, 590; P. Kunitzsch, ‘On Six Kinds of Astrolabe: a Hitherto Unknown Latin Treatise’, Centaurus 36 (1993), 200-208; M.-T. d’Alverny, Avicenna Latinus. Codices (with Addenda by S. Van Riet and P. Jodogne), Louvain-la-Neuve-Leiden, 1994, 407-408; R. Lemay, Abū Maʿšar al-Balḫī [Albumasar]: Liber introductorii maioris ad scientiam judiciorum astrorum, Napoli, 1995-1996, VII, 27-51; F. S. Pedersen, The Toledan Tables. A Review of the Manuscripts and the Textual Versions with an Edition, København, 2002, I, 118-119.