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 indeed say, as before, that in fact it is followed first by mere B, and then again by Bβ. But we, none the less, are committed to assertions which clash. We hold that A produces B, and that A produces Bβ; and one of these judgments must be false. For, if A produces mere B, then it does not produce Bβ. Hence β is either an event which is a gratuitous accident, or else α must have somehow (indirectly or directly) made this difference in B. But, if so, α is not inert, but is a part-cause of B; and therefore the sequence of B from mere A is false. The plausibility of our statement has proved illusory.

I am loath to perplex the question by subtleties, which would really carry us no further; but I will notice a possible evasion of the issue. The secondary qualities, I may be told, do not depend each on one primary, but are rather the adjectives of relations between these. They attend on certain relations, yet make no difference to what follows. But here the old and unresolved contradiction remains. It cannot be true that any relation (say of A to E), which produces another relation (say of B to F), should both produce this latter naked, and also attended by an adjective, β. One of these assertions must be false, and, with it, your conclusion. It is in short impossible to have differences which come without a difference, or which make no difference to what follows them. The attempt involves a contradiction, explicit or veiled, but in either case ruinous to the theory which adopts it.

We have now finished our discussion of erroneous views. I may perhaps, in this connection, be expected to say something on the Conservation of Energy. I am most unwilling to do this. One who, like myself, stands outside the sciences which use this idea, can hardly hope to succeed in apprehending it rightly. He constantly fails to distinguish between a mere working conception and a statement of fact. Thus, for example, “energy of position” and “potential energy” are phrases which in their actual employment, doubtless, are useful and accurate. But, to speak strictly, they are nonsense. If a thing disappears into conditions, which will hereafter produce it, then most assuredly in the interim it does not exist; and it is surely only by a licence that you can call the non-existent “in a state of conservation.” And hence, passing on, I will next take the Conservation of Energy to mean that at any moment actual matter and actual motion are an unaltered quantity. And this constancy may hold good either in each of several physical systems, or again in Nature as a whole (Chapter xxii). Now, if the idea is put forward as a hypothesis for working use only, I offer no criticism of that which is altogether beyond me. But, if it is presented, on the other hand, as a statement of fact, I will say at once that I see no reason to accept it as true; and I am quite sure that it is not provable. If, for the sake of argument however, we accept the quantitative constancy of matter and motion, I do not find that this tells us anything as to the position of the soul. For, although mind influences body and body alters mind, the quantity may throughout remain precisely the same. The loss and gain, on the psychical and physical side, may each, upon the whole, exactly balance the other; and thus the physical energy of the system may be thoroughly preserved. If, however, any one insists that motion always must be taken as resulting from motion, even then he may avoid the conclusion that psychical events are not causes. He may fall back on some form of the two parallel series which only seem to be connected. Or he may betake himself to a hypothesis which still maintains their causal connection. An arrangement is possible, by which soul and body make a difference to each other, while the succession on each side appears, and may be treated, as independent. The losses and gains upon each side amongst the different threads of causal sequence might counterbalance one another. They might hinder and help each other, so that in the end all would look as if they really did nothing, and as if each series was left alone to pursue its own private course. Such an arrangement seems undeniably possible, but I am far from suggesting that it is fact. For I reject the principle which would force us, without any reason, to entertain such subtleties.

I may be allowed to remark in conclusion that those who hold to the doctrine of “Conservation,” and who use this in any way as bearing on our views about the soul, may fairly be expected to make some effort. It seems incumbent on them to try to reconcile the succession of psychical events with the law of Causation. No one is bound to be intelligible outside his own science, I am quite convinced as to that. But such a plea is good only in the mouths of those who are willing to remain inside. And I must venture, respectfully but firmly, to insist on this point. We have seen that to deny the active