He translated the works of Bahya, Halevi, Saadiah and the grammatical treatises of Janah.
For this patron several of his treatises were written; and the commencement of his Canon of Medicine also dates from his stay in Hyrcania.
About loo treatises are ascribed to Avicenna.
Scarcely any member of the Arabian circle of the sciences, including theology, philology, mathematics, astronomy, physics and music, was left untouched by the treatises of Avicenna, many of which probably varied little, except in being commissioned by a different patron and having a different form or extent.
His Logic, Metaphysics, Physics, De Caelo, are treatises giving a synoptic view of Aristotelian doctrine.