After the death of Plato, Aristotle left Athens and went to live at the court of Hermeias, prince of Atarneus. He had resided here but three years, when Hermeias, falling into the hands of the Persians, was put to death. Aristotle took refuge in Mytilene, the chief city of Lesbos. Here he married Pythias, sister of Hermeias, and who, being exposed to persecution from the Persians, now coming into power there, he saved by a rapid flight. For the patriotic and philosophical prince Hermeias, Aristotle entertained a fervent and deep affection, and he dedicated to his memory a beautiful poem, which is still extant. On account of the admiration he expresses of his friend, he was afterwards absurdly charged with impiety in deifying a mortal.

In the year 356 B. C., Philip of Macedon wrote a famous letter to Aristotle, as follows: “King Philip of Macedon, to Aristotle, greeting. Know that a son has been born to me. I thank the gods, not so much that they have given him to me, as that they have permitted him to be born in the time of Aristotle. I hope that thou wilt form him to be a king worthy to succeed me, and to rule the Macedonians.”

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.

It was probably during the thirteen years of his second residence at Athens, that Aristotle composed or completed the greater part of his works which have descended to our days. The foundation of most of them was, doubtless, laid at an early period of his life; but they appear to have been gradually formed, and to have received continual additions and corrections. Among the works which especially belong to this period of his life, are his treatises on Natural History; which, as has been correctly observed by a late writer on this subject, are not to be considered as the result of his own observations only, but as a collection of all that had been observed by others, as well as by himself.

It is stated by Pliny, that “Alexander the Great, being smitten with the desire of knowing the natures of animals, ordered several thousand persons, over the whole of Asia and Greece, who lived by hunting, bird-catching and fishing, or who had the care of parks, herds, hives, seines, and aviaries, to furnish Aristotle with materials for a work on animals.” We are likewise informed that Aristotle received from Alexander the enormous sum of eight hundred talents,—nearly a million of dollars, to prosecute his researches in natural history,—a circumstance which did not escape the malice of his traducers, who censured him for receiving gifts from princes. Seneca, who states that Philip furnished Aristotle with large sums of money for his history of animals, had, doubtless, confounded the father and son.

Callisthenes, a relation of Aristotle, by his recommendation, attended Alexander in his expedition to Asia, and sent from Babylon to the philosopher, in compliance with his previous injunctions, the astronomical observations which were preserved in that ancient city, and which, according to the statement of Porphyrius, reached back as far as 1903 years before the time of Alexander the Great; that is, 2234 years before the Christian era.

Aristotle had, at this time, reached the most prosperous period of his life. The founder and leader of the principal school of Greece, and the undisputed head of Grecian philosophy, surrounded by his numerous disciples and admirers, protected by the conqueror of Asia, and by him furnished with the means of following his favorite pursuits, and of gratifying his universal spirit of inquiry, he had, probably, little to desire in order to fill up the measure of a philosopher’s ambition. But he did not continue to enjoy the favor of Alexander till the end. Callisthenes, by his free-spoken censures and uncourtly habits, had offended his master, and had been executed, on a charge of having conspired with some Macedonians to take away his life; and the king’s wrath appears to have extended to his kinsman, Aristotle, as being the person who had originally recommended him. It is not, however, probable that this circumstance caused any active enmity between the royal pupil and his master; even if we did not know that Alexander died a natural death, there would be no reason for listening to the absurd calumny that Aristotle was concerned in poisoning him. Aristotle indeed appears to have been considered, to the last, as a partisan of Alexander, and an opponent of the democratic interest.

When the anti-Macedonian party obtained the superiority at Athens in consequence of Alexander’s death, an accusation against Aristotle was immediately prepared, and the pretext selected, was, as in the case of Socrates, impiety, or blasphemy. He was charged by Eurymedon, the priest, and a man named Demophilus, probably a leader of the popular party, with paying divine honors to Hermeias, and perhaps with teaching certain irreligious doctrines. In order to escape this danger, and to prevent the Athenians, as he said, in allusion to the death of Socrates, from “sinning twice against philosophy,” he quitted Athens in the beginning of the year 322 B. C., and took refuge at Chalcis, in Eubœa, an island then under the Macedonian influence—leaving Theophrastus his successor in the Lyceum. There he died, of a disease of the stomach, in the autumn of the same year, being in the sixty-third year of his age. His frame is said to have been slender and weakly, and his health had given way in the latter part of his life, having probably been impaired by his unwearied studies and the intense application of his mind. The story of his having drowned himself in the Euripus of Eubœa, is fabulous.