It is his object to put the scientific method in complete possession of the whole range of human thought, especially of the department, hitherto unreduced to subjection, of social phenomena. Now there is a great rival in the field--theology--which, besides imparting its own supernatural tenets, influences our modes of thinking on almost all social questions. Theology cannot itself be converted into a branch of science; all those tenets by which it sways the hopes and fears of men are confessedly above the sphere of science: if science, therefore, is to rule absolutely, it must remove theology. But it can only remove by explaining; by showing how it came there, and how, in good time, it is destined to depart. If the scientific method is entirely to predominate, it must explain religion, as it must explain every thing that exists, or has existed; and it must also reveal the law of its departure--otherwise it cannot remain sole mistress of the speculative mind. Such is the office which the law of development we have just considered is intended to fulfil; how far it is capable of accomplishing its purpose we must now leave our readers to decide. Having thus, as he presumes, cleared the ground for the absolute and exclusive dominion of the positive method, M. Comte proceeds to erect the _hierarchy_, as he very descriptively calls it, of the several sciences. His classification of these is based on the simplest and most intelligible principle. We think that we rather add to, than diminish from, the merits of this classification, when we say, that it is such as seems spontaneously to arise to any reflective mind engaged in a review of human knowledge. Commencing with the most simple, general, and independent laws, it proceeds to those which are more complicated, which presume the existence of other laws; in such manner that at every stage of our scientific progress we are supporting ourselves on the knowledge acquired in the one preceding.