The “treatise” on the “traces of Christ” is part of a much larger work, The Book of Demonstration (Kitab al-burhan) that goes under the name of Eutychius of Alexandria, ed. Pierre Cachia, (Louvain:. 1960–61) Corpus Scriptorum Christianorum Orientalium, vols. 192, 209 (Arabic text), vols. 193, 210 (English translation). See paragraphs 310–365.