But it is one thing to say, or even to reason out cogently and satisfactorily in every way, that the [p.102] special science, if both persistently special and honestly scientific, must be sooner or later inwardly contradictory and treacherous to itself, and it is quite another thing to show the contradiction in actual cases. The actual cases, however, are more easily found than many are likely to suppose, and at mention they may even seem like forgotten memories, like things which at some time we have noticed but become callous towards. Thus the atom is through and through a self-contradiction, being itself only a part of a divided reality, yet at the same time itself real only because indivisible; and a science harbouring such an atom can hardly be said to be unmixedly physical. The vibration, too, already referred to here as motion in poise or at rest; infinity as one more quantity that is significant because not quantitative; the sensation, a component element of consciousness that cannot possibly be composite; the plenal physical medium, which can be physical only if displaceable by other material things, and so plenal only if not physical, and which has served besides as an immobile yet infinitely elastic basis of motion or its transmission; and, to give just one more instance, in moral and political science the person, a self-existent, actively free being or entity whose every deed as well as whose every thought is responsible to something, being adaptive and therefore social, social with other persons and with nature, and whose every virtue implies dependence and an existence shared with something else: these are all also self-contradictions. And in view of them who must not see how the special sciences are always more than special, ever correcting [p.103] in ways that may be unappreciated by themselves their partiality of view, ever responsible to the totality of things even while they would observe things only under selected view-points. Such contradictions, once more, show mind loyal to what students of logic are familiar with as the "universe of discourse." Even in science you cannot discourse about anything without at least implicitly discoursing about everything, although in order to do so you must speak in such paradoxes as the atom, the person, the biologist's "vital unit," the vibration, the plenum, and the like indefinitely.