Positivism, as is well known, makes many sciences and classifies them by an ascending scale of Laws. "La Philosophie Positive," writes Littré (_Paroles_, p. 10) ... "apercevant que, suivant la vraie conception, où la matière n'est pas séparable de ses propriétés, le mot de matérialisme n'avait plus d'emploi philosophique qu'en histoire, elle l'a renouvelé, et s'en est servie pour caractériser l'intrusion de la méthode de toute science inférieure dans la science supérieure." If Littré had said, "the intrusion of the _lowest_ into the highest," he would have rightly characterized the systems we are describing. Von Feuchtersleben puts the practical state of the question thus:--"All we can say is, that an intellectual world reveals itself to us, by the law of the true, the good, and the beautiful, and that a physical world manifests itself by those laws which act in space and time. What lies beyond these laws, as it were the substance of both worlds, we know not; we only call that of the physical world, matter or body in the abstract, that of the super-physical, we call spirit (Geist), and must never forget that hereby we have only pronounced an abstraction. "But now we ask further, wherein does this higher law manifest itself to us, as the physical law does in the material world? Nowhere but in man, and in him only through the medium of his cultivated and refined reason. What we feel, what we remember, nay, the very inmost sensations of our individual existence, may be referred to the world which surrounds us. Thought alone, exalted to the highest degree shows us another world. We are ourselves therefore not spirit, but we watch, as it were, what we call by that name, and which manifests itself to us only by its laws. (Est Deus in nobis.) Man, therefore, should be the link which connects the two worlds; and this is the problem, this is the enigma, which can never be solved." He adds in a note: "Materialism, that is, the view which will not allow the separation of the intellectual principle from the corporeal, but looks upon the former as a higher power of the latter, not only explains nothing, but makes the enigma still more obscure. _Medical Psychology_, Ed. Sydenham, pp. 15-16.