 Beyond this, the extant writings have to do mostly with medicine, including a number of smaller treatises, like a celebrated text on the difference between smallpox and measles (English translation in al-Rāzī  SM), and the by no means small Comprehensive Book, a staggeringly huge collection of notes on medicine that was compiled by al-Rāzī’s students after his death. The Comprehensive Book is sometimes said to present al-Rāzī’s “case notes”. But, while it is true that he reports on his own medical experiences, the work is more accurately described as a collection of excerpts from Greek and Arabic medical sources. When he does introduce “case notes” this is to provide counterexamples and amplifications for the textual evidence (Savage-Smith 2012). Broadly speaking, despite his often harsh diatribe against Galen’s failures in the Doubts, al-Rāzī’s own medical theories fall broadly within the Galenic framework, and thus deploy such standard concepts as the four humors, the natural powers of the body, and the role of pneuma in explaining animal sensation and motion.