In attempting an explanation of the universe, human thought, in its earliest stages of development, resorts to the idea of living personal agents enshrined in and moving every object, whether organic or inorganic, natural or artificial. In an advanced stage, it conceives a number of personal beings distinct from, and superior to nature, which preside over the different provinces of nature--the sea, the air, the winds, the rivers, the heavenly bodies, and assume the guardianship of individuals, tribes, and nations. As a further, and still higher stage, it asserts the unity of the Supreme Power which moves and vitalizes the universe, and guides and governs in the affairs of men and nations. The _Theological_ stage is thus subdivided into three epochs, and represented as commencing in _Fetichism_, then advancing to _Polytheism_, and, finally, consummating in _Monotheism_. The next stage, the _Metaphysical_, is a transitional stage, in which man substitutes abstract entities, as substance, force, Being _in se_, the Infinite, the Absolute, in the place of theological conceptions. During this period all theological opinions undergo a process of disintegration, and lose their hold on the mind of man. Metaphysical speculation is a powerful solvent, which decomposes and dissipates theology. It is only in the last--the _Positive_ stage--that man becomes willing to relinquish all theological ideas and metaphysical notions, and confine his attention to the study of phenomena in their relation to time and space; discarding all inquiries as to causes, whether efficient or final, and denying the existence of all entities and powers beyond nature. The first stage, in its religious phase, is _Theistic_, the second is _Pantheistic_, the last is _Atheistic_. The proofs offered by Comte in support of this theory are derived: I. _From Cerebral Organization_. There are three grand divisions of the Brain, the Medulla Oblongata, the Cerebellum, and the Cerebrum; the first represents the merely animal instincts the second, the more elevated sentiments, the third, the intellectual powers. Human nature must, therefore, both in the individual and in the race, be developed in the following order: (1.) in animal instincts; (2.) in social affections and communal tendencies; (3.) in intellectual pursuits. Infant life is a merely animal existence, shared in common with the brute; in childhood the individual being realizes his relation to external nature and human society; in youth and manhood he compares, generalizes, and classifies the objects of knowledge, and attains to science. And so the infancy of our race was a mere animal or savage state, the childhood of our race the organization of society, the youth and manhood of our race the development of science.