[Footnote 197: The source of this chapter is certainly the tractate _Adv. Omn. Haer._, formerly attributed to Tertullian and to be found in the second volume of that author’s works in Oehler’s edition. No other author mentions Apelles with such particularity, and all those subsequent to Tertullian appear to have taken their information either from Tertullian’s other works, from this tractate, or from our text. This tractate has been discussed in the Introduction (see Vol. I, pp. 12 and 23 _supra_) and perhaps all difficulties may be solved by supposing it to be, not indeed the actual _Syntagma_ of Hippolytus, but a summary of it.] BOOK VIII THE DOCETAE, MONOIMUS, AND OTHERS [Sidenote: p. 396.] 1. These are the contents of the 8th [Book] of the Refutation of all Heresies. 2. What are the opinions of the Docetae,[1] and that they teach things which they say are from the Physicist Philosophy.[2] 3. How Monoimus speaks foolishly, giving heed to poets and geometricians and arithmeticians. 4. How Tatian’s [heresy] sprang from the opinions of Valentinus and Marcion wherefrom he compounded his own. And that Hermogenes has made use of the teachings of Socrates, not of Christ. 5. How those err who contend that Easter should be celebrated on the 14th day [of the month]. 6. What is the error of the Phrygians, who think Montanus and Priscilla and Maximilla to be prophets. [Sidenote: p. 397.] 7. What is the vain doctrine of the Encratites, and that their teachings are compounded not out of the Holy Scriptures, but from their own [views] and from those of the Gymnosophists among the Indians.[3] 1. _The Docetae._