84 Mind and Matter The puzzle which puzzles every atom is the puzzle which puzzles ourselves—a conflict of duties—our duty towards ourselves, and our duty as members of a body politic. It is swayed by its sense of being a separate thing—of having a life to itself which nothing can share; it is also swayed by the feeling that, in spite of this, it is only part of an indi- viduality which is greater than itself and which absorbs it. Its action will vary with the predominance of either of these two states of opinion. . Unity and Multitude We can no longer separate things as \ve once could : every- thing tends towards unity; one thing, one action, in one place, at one time. On the other hand, we can no longer unify things as we once could; we are driven to ultimate atoms, each one of which is an individuality. So that we have an infinite multitude of things doing an infinite multi- tude of actions in infinite time and space ; and yet they are not many things, but one thing. The Atom The idea of an indivisible, ultimate atom is inconceivable by the lay mind. If we can conceive an idea of the atom at all, we can conceive it as capable of being cut in half ; indeed, we cannot conceive it at all unless we so conceive it. The only true atom, the only thing which we cannot subdivide and cut in half, is the universe. We cannot cut a bit off the universe and put it somewhere else. Therefore, the universe is a true atom and, indeed, is the smallest piece of indivisible matter which our minds can conceive ; and they cannot conceive it any more than, they can the indivisible, ultimate atom. Our Cells A string of young ducklings as they sidle along through grass beside a ditch—how like they are to a single serpent! I said in Life and Habit that a colossal being, looking at the earth through a microscope, would probably think the ants and flies of one year the same as those of the preceding year.