‘We tire of thinking and even of acting; we never tire of loving.’ In the following series of systematic essays upon Positivism the essential principles of the doctrine are first considered; I then point out the agencies by which its propagation will be effected; and I conclude by describing certain additional features indispensable to its completeness. My treatment of these questions will of course be summary; yet it will suffice, I hope, to overcome several excusable but unfounded prejudices. It will enable any competent reader to assure himself that the new general doctrine aims at something more than satisfying the Intellect; that it is in reality quite as favourable to Feeling and even to Imagination.