1 both pamphlets. The `sheets0' which Gregory says that he has collected are the 12 Books that follow. They are written in reply to Eunomius' pamphlet, `Apologia Apologiae,0' itself a reply to Basil's Refutation. The other pamphlet of Eunomius seems to have come out during the composition of Gregory's 12 Books: and was afterwards answered by the latter in a second 12th Book, but not now, because of the shortness of the time in which he had a copy of the `heretical volume0' in his hands. The two last books of the five which go under the title of Basil's Refutation are considered on good grounds to have been Gregory's, and to have formed that short reply to Eunomius which he read, at the Council of Constantinople, to Gregory of Nazianzen and Jerome (d. vir. illust. c. 128). Then he worked upon this longer reply. Thus there were in all three works of Gregory corresponding to the three attacks of Eunomius upon the Trinity.