The ‛Euthalian apparatus’ is a corpus of auxiliary texts that summarize Acts and the New Testament Letters. The material is found in a great number of Greek biblical manuscripts. Some sources identify the author as ‛Euthalius, bishop of Sulci’, but almost nothing is known about this figure. Vemund Blomkvist’s study is based on the idea that the biblical text and the apparatus form a ‛system’, and that this system may be studied as a unity. The commentary shows that the different genres of the apparatus offer quite different paraphrases of the apostolic writings: The argumenta present a radicalized interpretation of Paul’s theology, while the chapter titles seem to be closer to the biblical text. Together with Prof. David Hellholm, Blomkvist has published a study on the meta-terminology of the apparatus (‛Paraenesis as an ancient genre-designation’, 2002), also included in the present volume.