In the historical department may be mentioned Ptolemy Soter, who wrote the history of the wars of Alexander the Great; Apollodorus (fl. 200 B.C.), whose "Bibliotheca" contains a general sketch of the mystic legends of the Greeks; Eratosthenes (fl. 235 B.C.), the founder of scientific chronology in Greek history; Manetho (fl. 280 B.C.), who introduced the Greeks to a knowledge of the Egyptian religion and annals; and Berosus of Babylon, his contemporary, whose work, fragments of which were preserved by Josephus, was known as the "Babylonian Annals." While the Greeks of Alexandria thus gained a knowledge of the religious books of the nations conquered by Alexander, the same curiosity, combined with the necessities of the Jews of Alexandria, gave birth to the translation of the Bible into Greek, known under the name of Septuagint, which has exercised a more lasting influence on the civilized world than that of any book that has ever appeared in a new tongue. The beginning of that translation was probably made in the reigns of the first Ptolemies (320-249 B.C.), while the remainder was completed at a later period. The wonderful advance, which took place in pure and applied mathematics, is chiefly due to the learned men who settled in Alexandria; the greatest mathematicians and the most eminent founders of scientific geography were all either immediately or indirectly connected with the school of Alexandria. Euclid (fl. 300 B.C.) founded a famous school of geometry in that city, in the reign of the first Ptolemy. Almost the only incident of his life which is known to us is a conversation between him and that king, who, having asked if there was no easier method of learning the science, is said to have been told by Euclid, that "there was no royal path to geometry." His most famous work is his "Elements of Pure Mathematics," at the present time a manual of instruction and the foundation of all geometrical treatises. Archimedes (287-212 B.C.) was a native of Syracuse, in Sicily, but he traveled to Egypt at an early age, and studied mathematics there in the school of Euclid. He not only distinguished himself as a pure mathematician and astronomer, and as the founder of the theory of statics, but he discovered the law of specific gravity, and constructed some of the most useful machines in the mechanic arts, such as the pulley and the hydraulic screw. His works are written in the Doric dialect. Apollonius of Perga (221-204 B.C.) distinguished himself in the mathematical department by his work on "Conic Elements." Eratosthenes was not only prominent in the science of chronology, but was also the founder of astronomical geography, and the author of many valuable works in various branches of philosophy. Hipparchus (fl. 150 B.C.) is considered the founder of the science of exact astronomy, from his great work, the "Catalogue of the Fixed Stars," his discovery of the precession of the equinoxes, and many other valuable astronomical observations and