important, if at the same time, an insufficient explanation. It is not atoms as we should speak of them, such, for example, as we represent to ourselves as floating in the air, that are alone the principle, for the intervening nothing is just as essential. Thus here we have the first appearance of the atomic system. We must now give the further signification and determination of this principle. _a. The Logical Principle_ The principal point of consideration is the One, existent for itself: this determination is a great principle and one which we have not hitherto had. Parmenides establishes Being or the abstract universal; Heraclitus, process; the determination of being-for-self belongs to Leucippus. Parmenides says that the nothing does not exist at all; with Heraclitus Becoming existed only as the transition of Being into nothing where each is negated; but the view that each is simply at home with itself, the positive as the self-existent one and the negative as empty, is what came to consciousness in Leucippus, and became the absolute determination. The atomic principle in this manner has not passed away, for it must from this point of view always exist; the being-for-self must in every logical philosophy[69] be an essential moment and yet it must not be put forward as ultimate. In the logical progression from Being and Becoming to this thought-determination, Being as existent here and now[70] certainly first appears, but this last belongs to the sphere of finality and hence cannot be the principle of Philosophy. Thus, though the development of Philosophy in history must correspond to the development of logical philosophy, there will still be passages in it which are absent in historical development. For instance, if we wished to make Being as existent here the principle, it would be what we have in consciousness—there are things, these things are finite and bear a relation to one another—but this is the category of our unthinking knowledge, of appearance. Being-for-self, on the other hand, is, as Being, simple relation to itself, but through negation of the other-Being. If I say I am for myself, I not only am, but I negate in me all else, exclude it from me, in so far as it seems to me to be external. As negation of other being, which is just negation in relation to me, being-for-self is the negation of negation and thus affirmation; and this is, as I call it, absolute negativity in which mediation indeed is present, but a mediation which is just as really taken away.