The Medes and Persians, or Zend-speaking Iranians, those destroyers of the Assyrian and Babylonian empires, were a mighty branch of the great family of Aryas. The Iranians left the common home of the Aryas at a period so distant as to render useless every effort toward giving it possible or even probable chronology. They settled in regions called by them "Lands of Iran," which, up to the present day, constitute Persia. Some investigators assert that Iran-Persia was previously occupied by Tartars; but the earliest traditions preserved in the Zend, or ancient speech of Zarathustra, do not mention any struggles for supremacy between the races as having taken place. The Zend Avesta, the oldest traditional record of the people of Iran, presents a picture of the primitive migrations and the social condition of the Iranians. It exhibits them as divided into three classes--priests, soldiers and farmers; though, as yet, there was no such thing as the circumscription of caste. It would seem that the fusion with the Tartars--the supposed aborigines of Iran--was complete, as the Zend Avesta makes no mention of any subjugated people or lower class. The warriors and the agriculturists stood on a perfect social equality. The book of tradition nowhere mentions serfdom, slavery, or property in man. This would seem to authorize the conclusion that among the early Iranians, property in man was unknown. Certainly, at all events, if even the forms of slavery were present, they were in such abeyance as to escape the attention of Zarathustra (Zoroaster), the great moralist and lawgiver of his people, who lived long after the epoch of the early wanderings, and when the Iranic nation formed a well-organized society on Iran's soil. Zarathustra considers agriculture as morally and socially the noblest human occupation; but he speaks of the generous labor of freemen, not the forced drudgery of slaves. The Vendidad contains frequent allusions to the general occupations of life, and is especially minute regarding the details of husbandry--its wants, modes, products and implements. The farmer is to have at least a team of draught cattle, a harness and a whip; a plough, a hand-mill, and so forth; but there is no mention whatever of a slave as an agricultural requisite. The homestead of an Iranian consists of a habitation, a storehouse, a cellar, stables for horses, camels and cattle; but the records have no allusion to a cabin for the slaves. The Vendidad also describes how dogs--almost sacred to the Iranians--are to be posted to watch over the village and the herds; but nowhere says that they were to be used for watching and hunting slaves. Various operatives and artisans are enumerated, but none of them as bond-servants or as working under compulsion.