Haly-Abbas, a Persian by birth, flourished fifty years after Rhazes, and died A.D. 994. His _Almalelci_, in twenty volumes, constituted a quite complete system of theory and practice of medicine, which, however, was in large measure taken from Rhazes's _Continens_. It is generally regarded as the best work of any of the physicians of the Arabic Period; it is divided into three parts--a book on Health, a book on Death, and a book of Signs--and it is interesting to know that the portion devoted to midwifery and obstetrics was in the hands not only of the profession, but also of the midwives. Avicenna--Latinized form of his Arabic name, Ebn Sina--was born in Bokhara in 980. From his earliest youth he manifested a remarkable disposition for scientific study, and it is claimed that he mastered the entire Koran at the age of ten years; also that he devoted his entire days and the greater part of his nights to research, mastering philosophy,{062} mathematics, astronomy, and, later, medicine, which he studied at the university at Bagdad, in which city his talents were chiefly exhibited. He was received at court, loaded with favors, and elevated to the dignity of Vizier, but suddenly fell into disgrace, was deprived of property, imprisoned, and even threatened with execution. After two years, however, he was restored to liberty, and once more possessed the consideration of the public and the court, becoming the recipient of new honors. Meantime he had given himself up to intemperance, by which his previously robust constitution was undermined, and this, with excessive labor, brought about his demise at the too early age of fifty-six, in the year 1037. He was author of several books, the chief being the _Canon Medicinae_, which remained a classic for six centuries, constituting the medical code of Asia and Saracenic Europe; no author since Galen had enjoyed so wide and extensive authority in the medical world; and in the various medical schools professors, for the most part, confined themselves to reading the _Canon_ from their desks, explaining and commenting upon its text. The work was divided into five volumes, of which the first two comprised the principles of physiology, pathology, hygiene, and therapeutics, arranged to conform to the teachings of Aristotle and Galen; the third and fourth dealt with treatment; and the fifth wras devoted to the preparation and composition of remedies. Avicenna appears to have surpassed in subtlety both Aristotle and Galen; he was fond of metaphysical speculation, and his works were too much filled out with subtleties of language rather than with true science. Authors of this period were fond of torturing in every way possible the writings which they undertook to edit or quote from, and, instead of devoting themselves to original research, wasted time in seeking for vague and hidden meanings. That man was most esteemed as learned who could see the