meaning at all. They may look like idle ornaments of which science, if consistent, should strip itself. Such a conclusion, however, would be premature, since, if these two characters are removed, science bodily disappears. It would be impossible without them ever to ask Why, or any longer to say Because. And the function of sameness and difference, if we consider it, is obvious. For the external relations, which work, are summed up in the laws; and, on the other hand, the internal characters of the separate elements serve to connect them with these universal strings or hinges. And thus, while inoperative, sameness and difference are still effective indirectly, and in fact are indispensable. This would appear to be the essence of the mechanical view. But I am unable to state how far at present, through the higher regions of Nature, it has been in practice applied; and again I do not know how properly to interpret, for example, the (apparent) effect of identity in the case of continued motion through space. To speak generally, the mechanical view is in principle nonsense, because the position of the laws is quite inconsistent and unintelligible. This is indeed a defect which belongs necessarily to every special science (Chapter xi.), but in the sphere of Nature it reaches its lowest extreme. The identity of physical elements may thus be said to fall outside their own being, their universality seems driven into banishment and forced to reside solely in laws. And, since these laws on the one hand are not physical, and since on the other hand they seem essential to Nature, the essence of Nature seems, therefore, made alien to itself, and to be on either side unnaturally sundered. However, compulsion from outside is the one working principle which is taken to hold in the physical world. And, at least if we are true to our ideal, neither identity nor difference can act in Nature.
When we come to psychology this is altered. I do not mean that there the mechanical view ceases
