Tj3.... a few more things to consider:
The canon of Scripture, Old and New Testament, was finally settled at the Council of Rome in 382, under the authority of Pope Damasus I. It was soon reaffirmed on numerous occasions. The same canon was affirmed at the Council of Hippo in 393 and at the Council of Carthage in 397. In 405 Pope Innocent I reaffirmed the canon in a letter to Bishop Exuperius of Toulouse. Another council at Carthage, this one in the year 419, reaffirmed the canon of its predecessors and asked Pope Boniface to "confirm this canon, for these are the things which we have received from our fathers to be read in church."
All of these canons were identical to the modern Catholic Bible, and all of them included the deuterocanonicals.
This same canon was implicitly affirmed at the seventh ecumenical council, II Nicaea (787), which approved the results of the 419 Council of Carthage, and explicitly reaffirmed at the ecumenical councils of Florence (1442), Trent (1546), Vatican I (1870), and Vatican II (1965).
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Since you brought up Jerome before, you might be interested in the commentary from Protestant patristics scholar J. N. D. Kelly:
"For the great majority, however, the deutero-canonical writings ranked as Scripture in the fullest sense. Augustine, for example, whose influence in the West was decisive, made no distinction between them and the rest of the Old Testament . . . The same inclusive attitude to the Apocrypha was authoritatively displayed at the synods of Hippo and Carthage in 393 and 397 respectively, and also in the famous letter which Pope Innocent I dispatched to Exuperius, bishop of Toulouse, in 405" (Early Christian Doctrines, 55-56).
"It should be observed that the Old Testament thus admitted as authoritative in the Church was somewhat bulkier and morecomprehensive than the [Protestant Old Testament].. . It always included, though with varying degrees of recognition, the so-called Apocrypha or deutero-canonical books. The reason for this is that the Old Testament which passed in the first instance into the hands of Christians was.. . The Greek translation known as the Septuagint.. . Most of the Scriptural quotations found in the New Testament are based upon it rather than the Hebrew.. . In the first two centuries.. . The Church seems to have accept all, or most of, these additional books as inspired and to have treated them without question as Scripture. Quotations from Wisdom, for example, occur in 1 Clement and Barnabas.. . Polycarp cites Tobit, and the Didache [cites] Ecclesiasticus. Irenaeus refers to Wisdom, the History of Susannah, Bel and the Dragon [i.e. the deuterocanonical portions of Daniel], and Baruch. The use made of the Apocrypha by Tertullian, Hippolytus, Cyprian and Clement of Alexandria is too frequent for detailed references to be necessary" (Early Christian Doctrines, 53-54).
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Council of Rome
"Now indeed we must treat of the divine Scriptures, what the universal Catholic Church accepts and what she ought to shun. The order of the Old Testament begins here: Genesis, one book; Exodus, one book; Leviticus, one book; Numbers, one book; Deuteronomy, one book; Joshua [Son of] Nave, one book; Judges, one book; Ruth, one book; Kings, four books [that is, 1 and 2 Samuel and 1 and 2 Kings]; Paralipomenon [Chronicles], two books; Psalms, one book; Solomon, three books: Proverbs, one book; Ecclesiastes, one book; Canticle of Canticles, one book; likewise Wisdom, one book; Ecclesiasticus, one book.. . Likewise the order of the historical [books]: Job, one book; Tobit, one book; Esdras, two books [Ezra and Nehemiah]; Esther, one book; Judith, one book; Maccabees, two books" (Decree of Pope Damasus [A.D. 382]).
Council of Hippo
"[It has been decided] that besides the canonical Scriptures nothing be read in church under the name of divine Scripture. But the canonical Scriptures are as follows: Genesis, Exodus, Leviticus, Numbers, Deuteronomy, Joshua the Son of Nun, Judges, Ruth, the Kings, four books, the Chronicles, two books, Job, the Psalter, the five books of Solomon, the twelve books of the Prophets, Isaiah, Jeremiah, Daniel, Ezekiel, Tobit, Judith, Esther, Ezra, two books, Maccabees, two books.. . " (canon 36 [A.D. 393]).
Council of Carthage
"[It has been decided] that nothing except the canonical Scriptures should be read in the Church under the name of the divine Scriptures. But the canonical Scriptures are: Genesis, Exodus, Leviticus, Numbers, Deuteronomy, Joshua, Judges, Ruth, four books of Kings, Paralipomenon, two books, Job, the Psalter of David, five books of Solomon [Proverbs, Ecclesiastes, Song of Songs, Wisdom, Sirach], twelve books of the Prophets, Isaiah, Jeremiah, Daniel, Ezekiel, Tobit, Judith, Esther, two books of Esdras, two books of the Maccabees.. . " (canon 47 [A.D. 397]).
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A good article to read from a Catholic scholar: Dr. Sippo utterly refutes Webster on the Canon ... in it he answers your question about the Catholic Encyclopedia and will help clear up this error about the "additions" of books to the Bible.
Hope it helps... the truth will set you free!:D