Medicine was practiced by two kinds of experts: the physician (asu), and the exorcist (dsipu), and the talents of either or both might be demanded at the sick bed. There was a whole set of diagnostic texts in which a multitude of possible symptoms was listed and the diagnosis, prognosis and treatment given. Surgery was known and even delicate operations on the eye were performed. The Babylonians had a superb knowledge of human and animal anatomy and physiology and were aware, for example, of the circulation of the blood and the pulse.