In looking at the mere catalogue of the works of Aristotle, we are struck with his vast range of knowledge. He aimed at nothing less than the completion of a general encyclopedia of philosophy. He was the author of the first scientific cultivation of each science, and there was hardly any quality distinguishing a philosopher as such, which he did not possess in an eminent degree. Of all the philosophical systems of antiquity, that of Aristotle was the best adapted to the physical wants of mankind. His works consisted of treatises on natural, moral, and political philosophy, history, rhetoric, criticism,--indeed, there was scarcely a branch of knowledge which his vast and comprehensive genius did not embrace. His greatest claim to our admiration is as a logician. He perfected and brought into form those elements of the dialectic art which had been struck out by Socrates and Plato, and wrought them, by his additions, into so complete a system, that he may be regarded as, at once, the founder and perfecter of logic as an art, which has since, even down to our own days, been but very little improved. The style of Aristotle has nothing to attract those who prefer the embellishments of a work to its subject- matter and the scientific results which it presents. PERIOD THIRD. EPOCH OF THE DECLINE OF GREEK LITERATURE, 322 B.C.-1453 A.D. 1. ORIGIN OF THE ALEXANDRIAN LITERATURE.--As the literary predominance of Athens was due mainly to the political importance of Attica, the downfall of Athenian independence brought with it a deterioration, and ultimately an extinction of that intellectual centralization which for more than a century had fostered and developed the highest efforts of the genius and culture of the Greeks. While the living literature of Greece was thus dying away, the conquests of Alexander prepared a new home for the muses on the coast of that wonderful country, to which all the nations of antiquity had owed a part of their science and religious belief. In Egypt, as in other regions, Alexander gave directions for the foundation of a city to be called after his own name, which became the magnificent metropolis of the Hellenic world. This capital was the residence of a family who attracted to their court all the living representatives of the literature of Greece, and stored up in their enormous library all the best works of the classical period. It was chiefly during the reigns of the first three Ptolemies that Alexandria was made the new home of Greek literature. Ptolemy Soter (306-285 B.C.) laid the foundations of the library, and instituted the museum, or temple of the muses, where the literary men of the age were maintained by endowments. This encouragement of literature was continued by Ptolemy Philadelphus (285-247 B.C.). He had the celebrated Callimachus for his librarian, who bought up not only the whole of Aristotle's great collection of works, but transferred the native