(3.) _The reciprocal determination of the organic and inorganic world_, is made clear by what has already been said. The result to which every genuine philosophy of nature must come, is that the distinction between organic and inorganic nature is only in nature as object, and that nature, as originally productive, waves over both. If the functions of an organism are only possible on the condition that there is a definite external world, and an organic world, then must the external world and the organic world have a common origin. This can only be explained on the ground that inorganic nature presupposes in order to its existence a higher dynamical order of things, to which it is subject. There must be a third, which can unite again organic and inorganic nature; which can be a medium, holding the continuity between the two. Both must be identified in some ultimate cause, through which, as through one common soul of nature (world-soul), both the organic and inorganic, _i. e._ universal nature, is inspired; in some common principle, which, fluctuating between inorganic and organic nature, and maintaining the continuity of the two, contains the first cause of all changes in the one, and the ultimate ground of all activity in the other. We have here the idea of a universal organism. That it is one and the same organization which unites in one the organic and inorganic world, would appear from what has already been said of the parallel gradations of the two worlds. That which in universal nature is the cause of magnetism, is in organic nature the cause of sensibility, and the latter is only a higher potency of the former. Just as in the organic world through sensibility, so in universal nature through magnetism, there arises a duality from the ideality. In this way organic nature appears only as a higher stage of the inorganic; the very same dualism which is seen in magnetic polarity, electrical phenomena, and chemical differences, displays itself also in the organic world.