11. PRE-SOCRATIC PHILOSOPHY.--Philosophy was early cultivated by the Greeks, who first among all nations distinguished it from religion and mythology. For some time, however, after its origin, it was as far removed from the ordinary thoughts and occupations of the people as poetry was intimately connected with them. Poetry idealizes all that is most characteristic of a nation; its religion, mythology, political and social institutions, and manners. Philosophy, on the other hand, begins by detaching the mind from the opinions and habits in which it has been bred up, from the national conceptions of the gods and the universe, and from traditionary maxims of ethics and politics. The philosophy of Greece, antecedent to the time of Socrates, is contained in the doctrines of the Ionic, Eleatic, and Pythagorean. schools. Thales of Miletus (639-548 B.C.) was the first in the series of the Ionic philosophers. He was one of the Seven Sages, who by their practical wisdom nobly contributed to the flourishing condition of Greece. Thales, Solon, Bion (fl. 570 B.C.), Cleobulus (fl. 542 B.C.), Periander (fl. 598 B.C.), Pittacus of Mytilene (579 B.C.), and Chilon (fl. 542 B.C.), were the seven philosophers called the seven sages by their countrymen. Thales is said to have foretold an eclipse of the sun, for which he doubtless employed astronomical formulae, which he had obtained from the Chaldeans. His tendency was practical, and where his own knowledge was insufficient, he applied the discoveries of other nations more advanced than his own. He considered all nature as endowed with life, and sought to discover the principles of external forms in the powers which lie beneath; he taught that water was the principle of things. Anaximander (fl. 547 B.C.), and Anaximenes (fl. 548 B.C.) were the other two most distinguished representatives of the Ionic school. The former believed that chaotic matter was the principle of all things, the latter taught that it was air. The Eleatic school is represented by Xenophanes, Parmenides, and Zeno. As the philosophers of the first school were called Ionians from the country in which they resided, so these were named from Elea, a Greek colony of Italy. Xenophanes (fl. 538 B.C.), the founder of this school, adopted a different principle from that of the Ionic philosophers, and proceeded upon an ideal system, while that of the latter was exclusively founded upon experience. He began with the idea of the godhead, and showed the necessity of considering it as an eternal and unchanging existence, and represented the anthropomorphic conceptions of the Greeks concerning their gods as mere prejudices. In his works he retained the poetic form of composition, some fragments of which he himself recited at public festivals, after the manner of the rhapsodists. Parmenides flourished 504 years B.C. His philosophy rested upon the idea of existence which excluded the idea of creation, and thus fell into pantheism.