The Island of Cos is now called Stan-Co, and is situated not far from the coast of Ionia. Formerly it was considered as having a most salubrious climate; now that it is under the dominion of the Turks, it is considered most unhealthy. It possessed a temple dedicated to Æsculapius and{020} a celebrated medical school. But Hippocrates, not satisfied with what he could learn here, visited the principal foreign cities, and seems to have been a most accurate and painstaking observer and collector of notes. That he achieved great renown in his life is known, since Plato and even Aristotle refer to him as their authority in very many matters. His children and grandchildren followed in his footsteps, and published their writings under the same name; it has, therefore, become difficult to distinguish his works from theirs. Finally, authors more unscrupulous, who bore no relationship to him, attached his name to their own writings. But the true were, as a rule, easily distinguished from the spurious, and were carefully separated by those in charge of the Alexandrian library. The enumeration of his writings by different authors varies very much. Renouard, who seems to have studied the subject very carefully, gives the following as appearing to him to be the authentic list of writings of Hippocrates the Second,--i.e., the Great: The _Prognostic_, the _Aphorisms_, the first and third books of _Epidemics_, that on _Regimen in Acute Disease_, that on _Airs, Waters, and Places, that on Articulations and Luxations_, that on _Fractures_, and the _Mochlic_, or the treatise on instruments and reduction. This list does not comprise the fourth part of the entire Hippocratic collection, but its authenticity appears to be undoubted, and it suffices, as Renouard says, to justify the enthusiasm of his contemporaries and the admiration of posterity. Later, joined with the writings of Pythagoras, Plato, Aristotle, and others, they constituted the so-called _Hippocratic collection_, which was a definite part of the great libraries of Alexandria and Pergamos, and formed the most ancient authentic monument of medical science.