Sociology deals with super-organic evolution, which involves the co-ordinated actions of many individuals. To understand the social unit, we must study primitive man, especially the ideas which he forms of himself, of other beings, and of the surrounding world. The conception of a mind or other-self is gradually evolved through observation of natural phenomena which favor the notion of duality, especially the phenomena of sleep, dreams, swoons, and death. Belief in the influence of these doubles of the dead on the fortunes of the living leads to sorcery, prayer, and praise. Ancestor-worship is the ultimate source of all forms of religion; to it can be traced even such aberrant developments as fetichism and idolatry, animal-, plant-, and nature-worship. Thus the primitive man feels himself related not only to his living fellows, but to multitudes of supernatural beings about him. The fear of the living becomes the root of the political, and the fear of the dead the root of the religious, control. A society is an organic entity. Though differing from an individual organism in many ways, it yet resembles it in the permanent relations among its component parts. The Domestic Relations, by which the maintenance of the species is now secured, have come from various earlier and less developed forms; the militant type of society is accompanied by a lower, the industrial type by a higher stage of this development. Ceremonial observance is the most primitive kind of government, and the kind from which the political and religious governments have differentiated. Political organization is necessary in order to co-operation for ends which benefit the society directly, and the individual only indirectly. The ultimate political force is the