The physics, both of the Academy and the LycÊum, as they are built, not on observation, but on argument, have retarded the progress of real knowledge. The metaphysics of infinite, or finite, spirit, have too often been enlisted in the service of superstition. But the human faculties are fortified by the art and practice of dialectics; the ten predicaments of Aristotle collect and methodize our ideas, and his syllogism is the keenest weapon of dispute. It was dexterously wielded in the schools of the Saracens, but as it is more effectual for the detection of error than for the investigation of truth, it is not surprising that new generations of masters and disciples should still revolve in the same circle of logical argument. The mathematics are distinguished by a peculiar privilege, that, in the course of ages, they may always advance, and can never recede. But the ancient geometry, if I am not misinformed, was resumed in the same state by the Italians of the fifteenth century; and whatever may be the origin of the name, the science of algebra is ascribed to the Grecian Diophantus by the modest testimony of the Arabs themselves. They cultivated with more success the sublime science of astronomy, which elevates the mind of man to disdain his diminutive planet and momentary existence. The costly instruments of observation were supplied by the caliph Almamon, and the land of the ChaldÊans still afforded the same spacious level, the same unclouded horizon. In the plains of Sinaar, and a second time in those of Cufa, his mathematicians accurately measured a degree of the great circle of the earth, and determined at twenty-four thousand miles the entire circumference of our globe. From the reign of the Abbassides to that of the grandchildren of Tamerlane, the stars, without the aid of glasses, were diligently observed; and the astronomical tables of Bagdad, Spain, and Samarcand, correct some minute errors, without daring to renounce the hypothesis of Ptolemy, without advancing a step towards the discovery of the solar system. In the Eastern courts, the truths of science could be recommended only by ignorance and folly, and the astronomer would have been disregarded, had he not debased his wisdom or honesty by the vain predictions of astrology. But in the science of medicine, the Arabians have been deservedly applauded. The names of Mesua and Geber, of Razis and Avicenna, are ranked with the Grecian masters; in the city of Bagdad, eight hundred and sixty physicians were licensed to exercise their lucrative profession: in Spain, the life of the Catholic princes was intrusted to the skill of the Saracens, and the school of Salerno, their legitimate offspring, revived in Italy and Europe the precepts of the healing art. The success of each professor must have been influenced by personal and accidental causes; but we may form a less fanciful estimate of their general knowledge of anatomy, botany, and chemistry, the