Note 47:1 — PART II. Greek Dualism.
Reading edition
During the ‘Abbāsid Period there were many who secretly held Manichaean opinions. See Fihrist, Leipsig 1871, p. 338; See also Al-Mu‘tazila, ed. by T. W. Arnold, Leipsig 1902, p. 27, where the author speaks of a controversy between Abu ’l-Hudhail and Ṣālih, the Dualist. See also Macdonald's Muslim Theology, p. 133.