7. περὶ αἰσθήσεως καὶ αἰσθητῶν: De sensu et sensili: On sense and objects of sense.
8. περὶ μνήμης καὶ ἀναμνήσεως: De memoria et reminiscentia: On memory and recollection.
9. περὶ ὒπνου καὶ ἐγρηγόρσεως: De somno et vigilia: On sleep and waking.
10. περὶ ἐνυπνίων: De insomniis: On dreams.
11. περὶ τῆς καθ᾽ ὔπνον μαντικῆς or περὶ μαντικῆς τῆς ἐν τοῖς ὔπνοις: De divinatione per somnum: On prophecy in sleep.
12. περὶ μακροβιότητος καὶ βραχυβιότητος: De longitudine et brevitate vitae: On length and shortness of life.
13. περὶ νεότητος καὶ γήρως καὶ περὶ ζωῆςκαὶ θανάτου: De juventute et senectute et de vita et morte: On youth and age, and on life and death.
14. περὶ ἀναπνοῆς: De respiratione: On respiration. [Numbers 7-14 are grouped together as Parva naturalia.]
15. † περὶ πνεύματος: De spiritu: On innate spirit (spiritus vitalis).
16. περὶ τὰ ζῷα ἱστορίαι: Historia animalium: Description of facts about animals, i.e. their organs. &c.