The modern Aderbidjan, which was a part of Medea, the mountains of Koulderstan, and those of Diarbekr, abound with subterranean canals, by means of which the ancient inhabitants conveyed water to their parched soil in order to fertilize it. It was regarded as a meritorious act and a religious duty prescribed by Zoroaster, who, instead of preaching celibacy, mortifications, and other pretended virtues of the monkish sort, repeats continually in the passages that are preserved respecting him in the Sad-der and the Zend-avesta: "That the action most pleasing to God is to plough and cultivate the earth, to water it with running streams, to multiply vegetation and living beings, to have numerous flocks, young and fruitful virgins, a multitude of children," etc., etc. Among the aqueducts of Palmyra it appears certain, that, besides those which conducted water from the neighboring hills, there was one which brought it even from the mountains of Syria. It is to be traced a long way into the Desert where it escapes our search by going under ground. Thus ancient states prospered, because their social institutions conformed to the true laws of nature; and because men, enjoying liberty and security for their persons and their property, might display all the extent of their faculties,--all the energies of their self-love. CHAPTER XI. GENERAL CAUSES OF THE REVOLUTIONS AND RUIN OF ANCIENT STATES. Cupidity had nevertheless excited among men a constant and universal conflict, which incessantly prompting individuals and societies to reciprocal invasions, occasioned successive revolutions, and returning agitations. And first, in the savage and barbarous state of the first men, this audacious and fierce cupidity produced rapine, violence, and murder, and retarded for a long time the progress of civilization. When afterwards societies began to be formed, the effect of bad habits, communicated to laws and governments, corrupted their institutions and objects, and established arbitrary and factitious rights, which depraved the ideas of justice, and the morality of the people. Thus one man being stronger than another, their inequality--an accident of nature--was taken for her law;* and the strong being able to take the life of the weak, and yet sparing him, arrogated over his person an abusive right of property; and the slavery of individuals prepared the way for the slavery of nations.