ABSTRACT
Galen addresses Book III of the Critical Days to those physicians who are of a philosophical inclination, who want to know more than just how to use the critical days scheme for prognosis: they want to know how and why the scheme works, to understand its causes. Galen considered himself a philosopher, and, judging from his writings, must have enjoyed assuming the role of philosophical teacher.287 Displaying a smattering of knowledge of several non-medical sciences throughout his works, such as astronomy, astrology, mathematics, meteorology, and music theory (harmonics), Galen does not adhere to the modern divisions between the exact, the empirical, and the conjectural sciences. is material, although it concerns the content rather than the history of the Arabic transmission, is included to assist the reader in understanding this treatise, since the present volume is the rst in-depth study of the Critical Days to appear in recent times.
