About smells: Study of smells in nature. Types and differences.
About fish: Fragmentary physiognomic work. Special reference to the movement from the liquid element to the dry.
After the natural: Short introductory work that raises questions about first principles, being, motion, etc. Aristotelian influences.
Natural opinions: Issues of physics, combination with earlier theories, in a fragmentary form.
About sensations: The senses and their role. Physiognomic treatise.