Al-Nafïs revisited the cases of illnesses described by Hippocrates in his text, while comparing and contrasting those cases to his own cases and conclusions. In his commentary, al-Nafïs emphasized disease outbreaks. In one example, he compared a particular outbreak of malnutrition in Damascus, Syria, to an outbreak described by Hippocrates. Like Hippocrates, al-Nafïs constructed an outbreak map and both men concluded that Damascus was the origin of the outbreak. This method of locating an outbreak origin was used by John Snow 600 years later, when he constructed his own outbreak map. Other works Ibn al-Nafis also wrote a number of books and commentaries on different topics including on medicine, law, logic, philosophy, theology, grammar and environment. His commentaries include one on Hippocrates' book, several volumes on Avicenna's The Canon of Medicine, and a commentary on Hunayn Ibn Ishaq. al-Mūjaz fī al-Tibb (“A Summary of Medicine”); a short outline of medicine which was very popular among Arab physicians and got translated into Turkish and Hebrew. Kitāb al-Mukhtār fī al-Aghḏiyah (“The Choice of Foodstuffs”); a largely original contribution which was on the effects of diet on health. Bughyat al-Tālibīn wa Hujjat al-Mutaṭabbibīn (“Reference Book for Physicians”); a reference book for physicians containing his general knowledge to aid physicians in the diagnosis of disease, treatment of illness, and execution of surgical procedures. al-Muhaḏḏab fī al-Kuhl (“Polished Book on ophthalmology”); an original book on ophthalmology. Ibn al- Nafis made this book to polish and build off of concepts in ophthalmology originally made by Masawaiyh and Idn Ishaq. Sharḥ Masā’il Hunayn (“Commentary on Hunayn Ibn Ishaq's Questions”). al-Risālah al-Kāmiliyyah fī al-Ssīrah al-Nabawiyyah; (“Theologus Autodidactus”); a Philosophical treatise that is claimed by some to be the first theological novel. Anatomical discoveries In 1924, Egyptian physician, Muhyo Al-Deen Altawi, discovered a manuscript entitled, Sharh tashrih al-qanun li’ Ibn Sina, or "Commentary on Anatomy in Avicenna's Canon" in the Prussian State Library in Berlin while studying the history of Arabic Medicine at the medical faculty of Albert Ludwig's University. This manuscript covers in detail the topics of anatomy, pathology, and physiology. This is the earliest description of pulmonary circulation. Pulmonary circulation The most commonly accepted theory of cardiac function prior to Ibn al-Nafis was that of Galen. Galen taught that the blood reaching the right side of the heart went through invisible pores in the cardiac septum, to the left side of the heart, where it mixed with