Isaac Israeli (ca. 855-932 CE, Kairouan) was part of the first generation of authors who began to build a legacy of medical and philosophical knowledge based on Arabic translations of Greek writings and on their own experience. Isaac Israeli wrote at least three medical monographs, among them the Book on Fevers, which is composed of five treatises. The first of these, entitled Book on the Definition of Fever and Its Essence, is the subject of this...