_Hippocrates_, the Father of Medicine, was born at Cos during the golden age of Greece, 460 years before Christ. He belonged to the family of the Asclepiadæ, and, according to tradition, could trace his ancestors on the male side to Æsculapius, and on the female side to Hercules. He is said to have received his medical education from his father and from Herodicus, and to have been taught philosophy by Gorgias, the Sophist, and by Democritus, whom he afterwards cured of mental derangement. There was a very famous medical school at Cos, and the temple there held the notes of the accumulated experience of his predecessors, but Hippocrates visited also, for the purpose of study, various towns of Greece, and particularly Athens. He was a keen observer, and took careful notes of his observations. His reputation was such that his works are quoted by Plato and by Aristotle, and there are references to him by Arabic writers. His descendants published their own writings under his name, and there were also many forgeries, so that it is impossible to know exactly how many of the works attributed to him are authentic; but by a consensus of opinion the following books are considered genuine: "Prognostics," seven of the books of "Aphorisms," "On Airs, Waters and Places," "On Regimen in Acute Diseases," the first and third books of "Epidemics," "On the Articulations," "On Fractures," the treatise on "Instruments of Reduction," and "The Oath"; and the books considered almost certainly genuine are those dealing with "Ancient Medicine," "Surgery," "The Law," "Fistulæ," "Ulcers," "Hæmorrhoids," and "On the Sacred Disease" (Epilepsy). The famous Hippocratic Collection in the great libraries of Alexandria and Pergamos also comprised the writings of Pythagoras, Plato and Aristotle. The genius of Hippocrates is unsurpassed in the history of medicine. He was the first to trace disease to a natural and intelligible cause, and to recognize Nature as all-sufficient for healing, and physicians as only her servants. He discussed medical subjects freely and without an air of mystery, scorning all pretence, and he was also courageous enough to acknowledge his limitations and his failures. When the times in which he lived are considered, it is difficult to know which of his qualities to admire most, his love of knowledge, his powers of observation, his logical faculty, or his courage and truthfulness.