We have said that the Theory of Development, as expounded in "The Vestiges," is not necessarily atheistic, partly because the author professedly disclaims Atheism, and partly also because, in strict logic, it might still be possible, even on the basis of that theory, considered simply in itself and apart from the speculations with which it has been associated, to construct, from the actual phenomena of Nature, a valid proof for the being and attributes of God. And yet we have thought it necessary to advert to it as one of the recent speculations of science, because, whatever may be its _professed aim_, its _practical tendency_ is unquestionably hostile to the influence of religious truth. It will be found, in the great majority of cases, and especially in the case of ardent youthful minds, that this theory, when it is embraced as an article of their philosophic creed, is, to all practical purposes, tantamount to Atheism. For not to insist on the consideration, so forcibly stated by others,[55] that the natural argument for the Immortality of Man, or for the doctrine of a Future Life, as implying distinct individuality and continued self-consciousness, must be materially weakened, if not entirely neutralized, by a theory of development which traces the human lineage up through the monkeys and fishes to albumen impregnated by electricity, or, further still, to a diffused Nebula or universal Fire-Mist,--we think that the Sensational and Materialistic speculations with which the work abounds have a tendency to weaken the evidence for a living, personal, spiritual God, as the Creator and Moral Governor of the world, and to diminish that reverence, confidence, and love, which these aspects of His character alone can inspire. The system of Epicurus, although it contained a formal recognition of a First Cause, has always been held to be practically atheistic, simply because it removed God from the active superintendence of the affairs of the world, and excluded the doctrine of a special providence and of a moral government. It was held, in the words of Cicero, "Epicurum verbis reliquisse Deos,--re sustulisse."[56] And so, in "The Vestiges," Natural Law is substituted for Supernatural Interposition, not only in the common course of Providence, but in the stupendous work of Creation itself. SECTION III. THEORY OF _SOCIAL_ OR _HISTORICAL_ DEVELOPMENT.--AUGUSTE COMTE.