In the year 342 B. C., Aristotle was invited by Philip to take charge of the education of his son, Alexander, then fourteen years old. This charge was accepted, and Alexander was under his care three or four years. The particulars of his method of instruction are not known to us; but when we see the greatness of mind that Alexander displayed in the first years of his reign,—his command of his passions till flattery had corrupted him, and his regard for the arts and sciences,—we cannot but think that his education was judiciously conducted. It may be objected that Aristotle neglected to guard his pupil against ambition and the love of conquest; but it must be recollected that he was a Greek, and of course a natural enemy to the Persian kings; his hatred had been deepened by the fate of his friend Hermeias; and, finally, the conquest of Persia had, for a long time, been the wish of all Greece. It was, therefore, natural that Aristotle should exert all his talents to form his pupil with the disposition and qualifications necessary for the accomplishment of this object. Both father and son sought to show their gratitude for the services of such a teacher. Philip rebuilt Stagira, and established a school there for Aristotle. The Stagirites, in gratitude for this service, appointed a yearly festival, called _Aristotelia_. The philosopher continued at Alexander’s court a year after his accession to the throne, and is said to have then repaired to Athens. Ammonius, the Eclectic, says that he followed his pupil in a part of his campaigns; and this seems very probable; for it is hardly possible that so many animals as the philosopher describes could have been sent to Athens, or that he could have given so accurate a description of them without having personally dissected and examined them. We may conjecture that he accompanied Alexander as far as Egypt, and returned to Athens about 331 B. C., provided with the materials for his excellent History of Animals. Aristotle, after parting with Alexander, returned to Athens, where he resolved to open a school, and chose a house, which, from its vicinity to the temple of Apollo Lyceus, was called the _Lyceum_. Attached to this building was a garden, with walks, in Greek _peripatoi_, where Aristotle used to deliver his instructions to his disciples; whence his school obtained the name of _peripatetic_. It appears that his habit was to give one lecture in the early part of the day on the abstruser parts of his philosophy, to his more advanced scholars, which was called the _morning walk_, and lasted till the hour when people dressed and anointed themselves; and another lecture, called the _evening walk_, on more popular subjects, to a less select class.