The _Rhetoric_ follows, not disconnected with the logical treatises. Then may be named the _Metaphysics_, and then the writings devoted to Nature, to wit, the _Physics_, _Concerning the Heavens_, _Concerning Genesis and Decay_, the _Meteorology_, the _Mechanical Problems_, the _History of Animals_, the _Anatomical descriptions_, the _Psychology_, the _Parts of Animals_, the _Generation of Animals_. There was a Botany, which is lost. Finally, one names the great works on Ethics, Politics, and Poetry. Every one is overwhelmed by the compass of the achievement of this intellect. As to the transcendent value of the works on Logic, Metaphysics, Psychology, Rhetoric, Ethics, Politics, and Poetry, the world of scholarship has long been practically at one. There is a difference of opinion as to the quantity and quality of actual investigation represented by the writings on Natural History. But Aristotle is commonly regarded as the founder of systematic Zoology. On the whole, perhaps one will not err in repeating what has been said hundreds of times, that the works ascribed to Aristotle, and which undoubtedly were produced by him or his co-labourers under his direction, represent the most prodigious intellectual achievement ever connected with any single name. In the school of Aristotle, one phase or another of the master’s activity would be likely to absorb the student’s energy and fasten his entire attention. Aristotle’s own pupil and successor was the admirable Theophrastus, a man of comprehensive attainment, who nevertheless devoted himself principally to carrying on his master’s labours in botany, and other branches of natural science. A History of Physics was one of the most important of his works. Another pupil of Aristotle was Eudemus of Rhodes, who became a physicist and a historian of the three sciences of Geometry, Arithmetic, and Astronomy. He exhibits the learned activities thenceforth to characterize the Peripatetics. It would have been difficult to carry further the logic or metaphysics of the master. But his work in natural science might be supplemented, while the body of his writings offered a vast field for the labours of the commentator. And so, in fact, Peripatetic energies in the succeeding generations were divided between science and learning, the latter centring chiefly in historical and grammatical labours and the exposition of the master’s writing.[35] Aristotelianism was not to be the philosophy of the closing pre-Christian centuries, any more than it was to be the philosophy of the thousand years and more following the Crucifixion. During all that time, its logic held its own, and a number of its metaphysical principles were absorbed in other systems. But Aristotelianism as a system soon ceased to be in vogue, and by the sixth century was no longer known.