 He divides the work into seven chapters: (1) On the production of the parts of the soul; (2) On the Sensitive Soul; (3) On the Unity and Plurality of the Intellectual Soul; (4) On the Composition of the Rational Soul; (5) On the Powers of the Soul: whether they are parts of the soul; (6) On the Vegetative Soul; and (7) On the Parts of the Intellectual Soul. 