The parallel between Aenesidmus and Protagoras would become still more complete were it true that the Alexandrian philosopher also sought to base his Scepticism on the Heracleitean theory of Nature, arguing that contradictory assertions are necessitated by the presence of contradictory properties in every object.[See larger version]Fresh difficulties arise in explaining the activity which the Soul, in her turn, exerts. As originally conceived, her function was sufficiently clear. Mediating between two worlds, she transforms the lower one into a likeness of the higher, stamping on material objects a visible image of the eternal Ideas revealed to her by a contemplation of the Nous. And, as a further elaboration of this scheme, we were told that the primary soul generates an inferior soul, which, again, subdivides itself into the multitude of partial souls required324 for the animation of different bodily organisms. But now that our philosopher has entered on a synthetic construction of the elements furnished by his preliminary analysis, he finds himself confronted by an entirely new problem. For his implied principle is that each hypostasis must generate the grade which comes next after it in the descending series of manifestations, until the possibilities of existence have been exhausted. But in developing and applying the noetic Ideas, the Soul, apparently, finds a pre-existing Matter ready to hand. Thus she has to deal with something lower than herself, which she did not create, and which is not created by the Forms combined with it in sensible experience. We hear of a descent from thought to feeling, and from feeling to simple vitality,476 but in each instance the depth of the Souls fall is measured by the extent to which she penetrates into the recesses of a substance not clearly related to her nor to anything above her.