Quia nec ipsum est a monachis alienum hortos colere, agros exercere, et pomorum fecunditate gratulari; legitur enim in Psalmo centesimo vigesimo septimo, "Labores manuum tuarum manducabis; beatus es et bene tibi erit."'] In the first part of this treatise (commonly called the 'De Institutione Divinarum Litterarum') Cassiodorus briefly describes the contents of the nine Codices[88] which made up the Scripture of the Old and New Testaments, and mentions the names of the chief commentators upon each. After some important cautions as to the preservation of the purity of the sacred text and abstinence from plausible emendations, the author proceeds to enumerate the Christian historians--Eusebius, Orosius, Marcellinus, Prosper, and others[89]; and he then slightly sketches the characters of some of the principal Fathers--Hilary, Cyprian, Ambrose, Jerome, and Augustine. This part of the work contains an interesting allusion to 'Dionysius Monachus, Scytha natione, sed moribus omnino Romanus,' of whom Cassiodorus speaks as a colleague in his literary enterprises. This is the so-called Dionysius Exiguus, who fixed (erroneously, as it now appears) the era of the birth of Christ, and whose system of chronology founded on this event has been accepted by all the nations of Christendom. At the conclusion of this the first part of the treatise we find some general remarks on the nature of the monastic life, and some pictures of Vivarium and its neighbourhood, to which we are indebted for some of the information contained in the preceding pages. The book ends with a prayer, and contains thirty-three chapters, the same number, remarks Cassiodorus (who is addicted to this kind of moralising on numbers) that was reached by the years of the life of Christ on earth. [Footnote 88: 1. Octateuchus (Pentateuch, Joshua, Judges, Ruth). 2. Kings (Samuel and Kings, Chronicles). 3. Prophets (Four Major, including Daniel, and Twelve Minor). 4. Psalms. 5. Solomon (Proverbs, Ecclesiastes, Canticles, Wisdom, Ecclesiasticus). 6. Hagiographa (Tobias, Esther, Judith, Maccabees, Esdras). 7. Gospels. 8. Epistles of the Apostles (including that to the Hebrews). 9. Acts of the Apostles and Apocalypse.] [Footnote 89: The remarks on Marcellinus Comes and Prosper are worth transcribing: 'Hunc [Eusebium] subsecutus est suprascriptus Marcellinus Illyricianus, qui adhuc patricii Justiniani fertur egisse cancellos; sed meliore conditione devotus, a tempore Theodosii principis usque ad finem imperii triumphalis Augusti Justiniani opus suum, Domino juvante, perduxit; ut qui ante fuit in obsequio suscepto gratus, postea ipsius imperio copiose amantissimus appareret.' [The allusion to 'finem imperii Justiniani' was probably added in a later revision of the Institutiones.] 'Sanctus quoque Prosper Chronica ab Adam ad Genserici tempora et urbis Romae depraedationem usque perduxit.']