assisted by divine grace and working within the limit of his powers towards the accomplishment of the providential plan, is shown to us by the Old Testament as existing only in one people, the people of Israel; but the Christian spirit has extended the view to the universal history of mankind, and thus has arisen that conception of a law of continual progress unknown to antiquity, to which our modern society is so invincibly attached, but which is, we should never forget, an idea due to Christianity. Zoroastrianism was unlike other pagan religions in this, that it could not fail to admit and preserve the ancient tradition of a first sin. Rather would it have been forced to construct for itself an analogical myth, had it not found such in the primitive memories that it bent to its own doctrines. The tradition squared, indeed, but too well with its system of a dualism having a spiritual basis, although as yet but imperfectly freed from confusion between the physical and moral worlds. It explained quite naturally how man, a creature of the good God, and consequently originally perfect, should have fallen under the power of the evil spirit, thus contracting a taint which in the moral order subjected him to sin, in the material to death, and to all the miseries that poison earthly existence. Thus the notion of the sin of the first authors of humanity, the heritage of which weighs constantly on their descendants, is a fundamental one in Mazdean books. The modification of legends relative to the first man even resulted in the mythic conceptions of the later periods of Zoroastrianism, in attaching a rather singular repetition of this first transgression to several successive generations in the initial ages of humanity.