made us poets against our will.

Against his will, however, Locke was drawn to enlarge the subjective sphere. The actual existence of mind was evident: you had only to notice the fact that you were thinking. Conscious mind, being thus known to exist directly and independently of the body, was a primary constituent of reality: it was a fact on its own account.[6] Common sense seemed to testify to this, not only when confronted with the "I think, therefore I am" of Descartes, but whenever a thought produced an action. Since mind and body interacted,[7] each must be as real as the other and, as it were, on the same plane of being. Locke, like a good Protestant, felt the right of the conscious inner man to assert himself: and when he looked into his own mind, he found nothing to define this mind except the ideas which occupied it. The existence which he was so sure of in himself was therefore the existence of his ideas.

Here, by an insensible shift in the meaning of the word "idea", a momentous revolution had taken place in psychology. Ideas had originally meant objective terms distinguished in thought-images, qualities, concepts, propositions. But now ideas began to mean living thoughts, moments or states of consciousness. They became atoms of mind, constituents of experience, very much as material atoms were conceived to be constituents of natural objects. Sensations became the only objects of sensation, and ideas the only objects of ideas; so that the material world was rendered superfluous, and the only scientific problem was now to construct a universe in terms of analytic psychology. Locke himself did not go so far, and continued to assign physical causes and physical objects to some, at least, of his mental units; and indeed sensations and ideas could not very well have other than physical causes, the existence of which this new psychology was soon to deny: so that about the origin of its data it was afterwards compelled to preserve a discreet silence. But as to their combinations and reappearances, it was able to invoke the principle of association: a thread on which many shrewd observations may be strung, but which also, when pressed, appears to be nothing but a verbal mask for organic habits in matter.

The fact is that there are two sorts of unobjectionable psychology, neither of which describes a mechanism of disembodied mental states, such as the followers of Locke developed into modern idealism, to the confusion of common sense.[8] One unobjectionable sort of psychology is biological, and studies life from the outside. The other sort, relying on memory and dramatic imagination, reproduces life from the inside, and is literary. If the literary psychologist is a man of genius, by the clearness and range of his memory, by quickness of sympathy and power of suggestion, he may come very near to the truth of experience, as it has been or might be unrolled in a human being.[9] The ideas with which Locke operates are simply high lights picked out by attention in this nebulous continuum, and identified by names. Ideas, in the original ideal sense of the word, are indeed the only definite terms which attention can discriminate and rest upon; but the unity of these units is specious, not existential. If ideas were not logical or aesthetic essences but self-subsisting feelings, each knowing itself, they would be insulated for ever; no spirit could ever survey, recognise, or compare them; and mind would have disappeared in the analysis of mind.

These considerations might enable us, I think, to mark the just frontier of common sense even in this debatable land of psychology. All that is biological, observable, and documentary in psychology falls within the lines of physical science and offers no difficulty in principle. Nor need literary psychology form a dangerous salient in the circuit of nature. The dramatic poet or dramatic historian necessarily retains the presupposition of a material world, since beyond his personal memory (and even within it) he has nothing to stimulate and control his dramatic imagination save knowledge of the material circumstances in which people live, and of the material expression in action or words which they give to their feelings. His moral insight simply vivifies the scene that nature and the sciences of nature spread out before him: they tell him what has happened, and his heart tells him what has been felt. Only literature can describe experience for the excellent reason that the terms of experience are moral and literary from the beginning. Mind is incorrigibly poetical: not because it is not attentive to material facts and practical exigencies, but because, being intensely attentive to them, it turns them into pleasures and pains, and into many-coloured ideas. Yet at every turn there is a possibility and an occasion for transmuting this poetry into science, because ideas and emotions, being caused by material events, refer to these events, and record their order.

All philosophies are frail, in that they are products of the human mind, in which everything is essentially reactive, spontaneous, and volatile: but as in passion and in language, so in philosophy, there are certain comparatively steady and hereditary principles, forming a sort of orthodox reason, which is or which may become the current grammar of mankind. Of philosophers who are orthodox in this sense, only the earliest or the most powerful, an Aristotle or a Spinoza, need to be remembered, in that they stamp their language and temper upon human reason itself. The rest of the orthodox are justly lost in the crowd and relegated to the chorus. The frailty of heretical philosophers is more conspicuous and interesting: it makes up the chronique scandaleuse of the mind, or the history of philosophy. Locke belongs to both camps: he was restive in his orthodoxy and timid in his heresies; and like so many other initiators of revolutions, he would be dismayed at the result of his work. In intention Locke occupied an almost normal philosophic position, rendered precarious not by what was traditional in it, like the categories of substance and power, but rather by certain incidental errors—notably by admitting an experience independent of bodily life, yet compounded and evolving in a mechanical fashion. But I do not find in him a prickly nest of obsolete notions and contradictions from which, fledged at last, we have flown to our present enlightenment. In his person, in his temper, in his allegiances and hopes, he was the prototype of a race of philosophers native and dominant among people of English speech, if not in academic circles, at least in the national mind. If we make allowance for a greater personal subtlety, and for the diffidence and perplexity inevitable in the present moral anarchy of the world, we may find this same Lockian eclecticism and prudence in the late Lord Balfour: and I have myself had the advantage of being the pupil of a gifted successor and, in many ways, emulator, of Locke, I mean