Of Aristotle's immediate successors one deserves to be noticed here, namely, Strato of Lampsacus, who developed his master's cosmology into a system of naturalism.
Strato appears to reject Aristotle's idea of an original source of movement and life extraneous to the world in favour of an immanent principle.
It was perhaps a Parthian governor of Mesopotamia that was called in to help Strato of Beroea against Demetrius III.; but before long Mesopotamia (especially the district of Nisibis) was attached to the growing dominions of Armenia under its ambitious king Tigranes, perhaps with the consent of Sinatruces (Sanatruces).
Cudworth criticizes two main forms of materialistic atheism, the atomic, adopted by Democritus, Epicurus and Hobbes; and the hylozoic, attributed to Strato, which explains everything by the supposition of an inward self-organizing life in matter.
The naturalistic tendency of the school reached its full expression in Strato of Lampsacus, the most independent, and probably the ablest, of the earlier Peripatetics.