The Coptic manuscripts in the Freer collection - Worrell, William Hoyt, n. 1879 (Macmillan, 1923)
Part I of this volume was published in a small edition in 1916. Both parts of the present edition also issued separately.
"It is not improbable that further study will dissociate these homilies from Theophilus... and Celestinus. The only certain date is fixed by the colophone of 975 A.D."