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up. We may respect the demarcations established by usage, but we must ascertain, if possible, the fundamental affinities. There is, for instance, a broad distinction between Science and Art, which, so far from requiring to be effaced, requires to be emphasised: it is that in Science the paramount appeal is to the Intellect—its purpose being instruction; in Art, the paramount appeal is to the Emotions—its purpose being pleasure. A work of Art must of course indirectly appeal to the Intellect, and a work of Science will also indirectly appeal to the Feelings; nevertheless a poem on the stars and a treatise on astronomy have distinct aims and distinct methods. But having recognised the broadly-marked differences, we are called upon to ascertain the underlying resemblances. Logic and Imagination belong equally to both. It is only because men have been attracted by the differences that they have overlooked the not less important affinities. Imagination is an intellectual process common to Philosophy and Art; but in each it is allied with different processes, and directed to different ends; and hence, although the "Principia" demanded an imagination of not less vivid and sustained power than was demanded by "Othello," it would be very false psychology to infer that the mind of Newton was competent to the creation of "Othello," or the mind of Shakspeare capable of producing the "Principia." They were specifically different minds; their works were specifically different. But in both the imagination was intensely active. Newton had a mind predominantly ratiocinative: its movement was spontaneously towards the abstract relations of things. Shakspeare had a mind predominantly emotive, the intellect always moving in alliance with the feelings, and spontaneously fastening upon the concrete facts in preference to their abstract relations. Their mental Vision was turned towards images of different orders, and it moved in alliance with different faculties; but this Vision was the cardinal quality of both. Dr. Johnson was guilty of a surprising fallacy in saying that a great mathematician might also be a great poet: "Sir, a man can walk east as far as he can walk west." True, but mathematics and poetry do not differ as east and west; and he would hardly assert that a man who could walk twenty miles could therefore swim that distance.

      The real state of the case is somewhat obscured by our observing that many men of science, and some even eminent as teachers and reporters, display but slender claims to any unusual vigour of imagination. It must be owned that they are often slightly dull; and in matters of Art are not unfrequently blockheads. Nay, they would themselves repel it as a slight if the epithet "imaginative" were applied to them; it would seem to impugn their gravity, to cast doubts upon their accuracy. But such men are the cisterns, not the fountains, of Science. They rely upon the knowledge already organised; they do not bring accessions to the common stock. They are not investigators, but imitators; they are not discoverers—inventors. No man ever made a discovery (he may have stumbled on one) without the exercise of as much imagination as, employed in another direction and in alliance with other faculties, would have gone to the creation of a poem. Every one who has seriously investigated a novel question, who has really interrogated Nature with a view to a distinct answer, will bear me out in saying that it requires intense and sustained effort of imagination. The relations of sequence among the phenomena must be seen; they are hidden; they can only be seen mentally; a thousand suggestions rise before the mind, but they are recognised as old suggestions, or as inadequate to reveal what is sought; the experiments by which the problem may be solved have to be imagined; and to imagine a good experiment is as difficult as to invent a good fable, for we must have distinctly PRESENT—clear mental vision—the known qualities and relations of all the objects, and must see what will be the effect of introducing some new qualifying agent. If any one thinks this is easy, let him try it: the trial will teach him a lesson respecting the methods of intellectual activity not without its use. Easy enough, indeed, is the ordinary practice of experiment, which is either a mere repetition or variation of experiments already devised (as ordinary story-tellers re-tell the stories of others), or else a haphazard, blundering way of bringing phenomena together, to see what will happen. To invent is another process. The discoverer and the poet are inventors; and they are so because their mental vision detects the unapparent, unsuspected facts, almost as vividly as ocular vision rests on the apparent and familiar.

      It is the special aim of Philosophy to discover and systematise the abstract relations of things; and for this purpose it is forced to allow the things themselves to drop out of sight, fixing attention solely on the quality immediately investigated, to the neglect of all other qualities. Thus the philosopher, having to appreciate the mass, density, refracting power, or chemical constitution of some object, finds he can best appreciate this by isolating it from every other detail. He abstracts this one quality from the complex bundle of qualities which constitute the object, and he makes this one stand for the whole. This is a necessary simplification. If all the qualities were equally present to his mind, his vision would be perplexed by their multiple suggestions. He may follow out the relations of each in turn, but he cannot follow them out together.

      The aim of the poet is very different. He wishes to kindle the emotions by the suggestion of objects themselves; and for this purpose he must present images of the objects rather than of any single quality. It is true that he also must exercise a power of abstraction and selection, tie cannot without confusion present all the details. And it is here that the fine selective instinct of the true artist shows itself, in knowing what details to present and what to omit. Observe this: the abstraction of the philosopher is meant to keep the object itself, with its perturbing suggestions, out of sight, allowing only one quality to fill the field of vision; whereas the abstraction of the poet is meant to bring the object itself into more vivid relief, to make it visible by means of the selected qualities. In other words, the one aims at abstract symbols, the other at picturesque effects. The one can carry on his deductions by the aid of colourless signs, X or Y. The other appeals to the emotions through the symbols which will most vividly express the real objects in their relations to our sensibilities.

      Imagination is obviously active in both. From known facts the philosopher infers the facts that are unapparent. He does so by an effort of imagination (hypothesis) which has to be subjected to verification: he makes a mental picture of the unapparent fact, and then sets about to prove that his picture does in some way correspond with the reality. The correctness of his hypothesis and verification must depend on the clearness of his vision. Were all the qualities of things apparent to Sense, there would be no longer any mystery. A glance would be Science. But only some of the facts are visible; and it is because we see little, that we have to imagine much. We see a feather rising in the air, and a quill, from the same bird, sinking to the ground: these contradictory reports of sense lead the mind astray; or perhaps excite a desire to know the reason. We cannot see—we must imagine—the unapparent facts. Many mental pictures may be formed, but to form the one which corresponds with the reality requires great sagacity and a very clear vision of known facts. In trying to form this mental picture we remember that when the air is removed the feather fails as rapidly as the quill, and thus we see that the air is the cause of the feather's rising; we mentally see the air pushing under the feather, and see it almost as plainly as if the air were a visible mass thrusting the feather upwards.

      From a mistaken appreciation of the real process this would by few be called an effort of Imagination. On the contrary some "wild hypothesis" would be lauded as imaginative in proportion as it departed from all suggestion of experience, i.e. real mental vision. To have imagined that the feather rose owing to its "specific lightness," and that the quill fell owing to its "heaviness," would to many appear a more decided effort of the imaginative faculty. Whereas it is no effort of that faculty at all; it is simply naming differently the facts it pretends to explain. To imagine—to form an image—we must have the numerous relations of things present to the mind, and see the objects in their actual order. In this we are of course greatly aided by the mass of organised experience, which allows us rapidly to estimate the relations of gravity or affinity just as we remember that fire burns and that heated bodies expand. But be the aid great or small, and the result victorious or disastrous, the imaginative process is always the same.

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