RELIGION.--The ancient religion of the Iranians, including the Medes and Persians, was reduced to a system by the Bactrian sage, _Zoroaster_ (or Zarathustra), who, in the absence of authentic knowledge respecting him, may be conjecturally placed at about 1000 B.C. The _Zendavesta_, the sacred book of the Parsees, the adherents of this religion, is composed of parts belonging to very different dates. It is the fragment of a more extensive literature no longer extant. The Bactrian religion differed from that of their Sanskrit-speaking kindred on the Indus, in being a form of dualism. It grew out of a belief in good demons or spirits, and in evil spirits, making up two hosts perpetually in conflict with each other. At the head of the host of good spirits, in the Zoroastrian creed, was _Ormuzd_, the creator, and the god of light; at the head of the evil host, was _Ahriman_, the god of darkness. The one made the world good, the other laid in it all that is evil. The one is disposed to bless man, the other to do him harm. The conflict of virtue and vice in man is a contest for control on the part of these antagonistic powers. In order to keep off the spirits of evil, one must avoid what is morally or ceremonially unclean. He who lived pure, went up at death to the spirits of light. The evil soul departed to consort with evil spirits in the region of darkness. _Mithra_, the sun-god in the Zoroastrian system, is the equal, though the creature, of _Ormuzd_. Mithra is the conqueror of darkness, and so the enemy of falsehood. The Medes and Persians were fire-worshipers. To the good spirits, they ascribed life, the fruitful earth, the refreshing waters, fountains and rivers, the tilled ground, pastures and trees, the lustrous metals, also truth and the pure deed. To the evil spirits belonged darkness, disease, death, the desert, cold, filth, sin, and falsehood. The animals were divided between the two realms. All that live in holes, all that hurt the trees and the crops, rats and mice, reptiles of all sorts, turtles, lizards, vermin, and noxious insects, were hateful creatures of _Ahriman_. To kill any of these was a merit. The dog was held sacred; as was also the cock, who announces the break of day. In the system of worship, sacrifices were less prominent than in India. Prayers, and the iteration of prayers, were of great moment.