A brief notice must be given of the celebrated physician and philosopher, Ali bin Ridhwan, who died A.D. 1067. He was such a prodigy of precocious learning that he began to lecture on medicine and philosophy at Cairo from his fourteenth year. He afterwards also taught astronomy. At the age of thirty-two he had attained a great reputation as a physician, and was a rich man at sixty. He left more than one hundred books which he had composed, and he himself says: 'I made abridgments of the chief philosophical works of the ancients, and left in this manner five books on philology; ten on law; the medical works of Hippocrates and Galen; the book of plants of Dioskorides; the books of Rufus, Paulus, Hawi, and Razi; four books on agriculture and drugs; four books for instruction in the 'Almagest' of Ptolemy, and an introduction to the study of it, and to the square of Ptolemy; as also to the works of Plato, Alexander, Themistios, and Al-Farabi. I purchased all these books, no matter what they cost, and preserved them in chests, although it would have been more profitable to have sold them again rather than have kept them.' Ibn Batlan, a clever physician, was a contemporary of Ibn Ridhwan, and travelled from Baghdad to Egypt only for the purpose of making his acquaintance, but the result does not appear to have been satisfactory to either party. He died A.D. 1063, leaving a number of works on medical and other subjects. Abu Hamid Al-Ghazali was born A.D. 1058. He was considered chiefly as a lawyer and a mystic, but here he will be noticed chiefly as a philosopher and the author of 'The Ruin of Philosophers,' noticed at length by Haji Khalfa in his 'Encyclopaedical Dictionary,' under No. 3764. But Ghazali's most celebrated work is 'The Resuscitation of Religious Sciences,' which is so permeated by the genius of Islam that, according to the general opinion of scholars, the Muhammadan religion, if it were to perish, might again be restored from this work alone. Orthodox fanatics, nevertheless, attacked his works as being schismatic, and they were even burnt in the Mugrib. He was born at Tus (the modern Mashad), in Khurasan, and passed his life partly there, also at Naisapur, Baghdad, Damascus, Egypt, and finally returned to Tus, where he died A.D. 1111. His works are very numerous, and all of them are instructive.