Encouragement to Medicine: The knowledge of arts as the distinguishing feature of humans from other living beings.
On the Best Teaching: Refutation of the teachings of Favorinus, a rhetorician and philosopher of the Skeptical school.
That the Best Doctor is also a Philosopher: Address to those who consider themselves followers of Hippocratic theories without applying them in practice.
On the Sects for Beginners: The main schools of medicine (empirical, dogmatic, methodical) and the positions each supports.
On Medical Experience: Recording of the arguments of two doctors, one empirical and one dogmatic, regarding medical experience.
On the Elements According to Hippocrates A, B: The primary and basic elements from the composition of which the essence of beings (and humans) is made.