Camb., 1898, and The Mystics of Islam, Lond. 1914), and by Prof. Browne (Literary Hist. of Persia, Lond., 1902, chap. xiii.), and forms part of the influence which came into Islam at the introduction of Greek philosophy under the 'Abbasids. But as in philosophy and other cultural transmissions direct Greek influence was preceded by an indirect influence brought to bear through Syriac and Persian, so it was also in neo-platonic theology, for neo-Platonic influences had already been brought to bear upon the Syrians and Persians in the pre-Islamic period. In the forefront of the later direct influence must be placed the so-called Theology of Aristotle, which it is no exaggeration to describe as the most prominent and the widest circulated manual of neo-Platonism which has ever appeared. It is, as we have already stated, an abridged translation of the last three books of Plotinus' Enneads. Now the mysticism of Plotinus is philosophical and not religious, but it lends itself to a theological interpretation very easily, just as neo-Platonism as a whole very readily became a theological system in the hands of Jamblichus, of the pagans of Harran, and such like; and the Sufis were inclined to make this application, whilst the falasifa confined themselves to its philosophical side. It seems probable that the influence of the Pseudo-Dionysius was brought to bear upon Islam about the same time. The Pseudo-Dionysian writings consist of four treatises, of which two, a treatise "On Mystical Theology" in five chapters,
