I wish to guard the Principle of Vision from certain misconceptions which might arise on a simple statement of it. The principle insists on the artist assuring himself that he distinctly sees what he attempts to represent. What he sees, and how he represents it, depend on other principles. To make even this principle of Vision thoroughly intelligible in its application to all forms of Literature and Art, it must be considered in connection with the two other principles — Sincerity and Beauty, which are involved in all successful works.

Genius is rarely able to give any account of its own processes. But those who have had ample opportunities of intimately knowing the growth of works in the minds of artists, will bear me out in saying that a vivid memory supplies the elements from a thousand different sources, most of which are quite beyond the power of localisation, the experience of yesterday being strangely intermingled with the dim suggestions of early years, the tones heard in childhood sounding through the diapason of sorrowing maturity; and all these kaleidoscopic fragments are recomposed into images that seem to have a corresponding reality of their own.

Our native susceptibilities and acquired tastes determine which of the many qualities in an object shall most impress us, and be most clearly recalled. One man remembers the combustible properties of a substance, which to another is memorable for its polarising property; to one man a stream is so much water-power, to another a rendezveus for lovers.

Minds differ in the vividness with which they recall the elements of previous experience, and mentally see the absent objects; they differ also in the aptitudes for selection, abstraction, and recombination: the fine selective instinct of the artist, which makes him fasten upon the details which will most powerfully affect us, without any disturbance of the harmony of the general impression, does not depend solely upon the vividness of his memory and the clearness with which the objects are seen, but depends also upon very complex and peculiar conditions of sympathy which we call genius.

If clear Vision be indispensable to success in Art, all means of securing that clearness should be sought. Now one means is that of detaining an image long enough before the mind to allow of its being seen in all its characteristics. The explanation Newton gave of his discovery of the great law, points in this direction; it was by always thinking of the subject, by keeping it constantly before his mind, that he finally saw the truth. Artists brood over the chaos of their suggestions, and thus shape them into creations.

An artist produces an effect in virtue of the distinctness with which he sees the objects he represents, seeing them not vaguely as in vanishing apparitions, but steadily, and in their most characteristic relations. To this Vision he adds artistic skill with which to make us see. He may have clear conceptions, yet fail to make them clear to us: in this case he has imagination, but is not an artist. Without clear Vision no skill can avail. Imperfect Vision necessitates imperfect representation; words take the place of ideas.

I wish to call special attention to the psychological fact, that fairies and demons, remote as they are from experience, are not created by a more vigorous effort of imagination than milk maids and poachers. The intensity of vision in the artist and of vividness in his creations are the sole tests of his imaginative power.

Foolish critics often betray their ignorance by saying that a painter or a writer "only copies what he has seen, or puts down what he has known." They forget that no man imagines what he has not seen or known, and that it is in the selection of the characteristic details that the artistic power is manifested.

Philosophy and Art both render the invisible visible by imagination. Where Sense observes two isolated objects, Imagination discloses two related objects. This relation is the nexus visible. We had not seen it before; it is apparent now. Where we should only see a calamity the poet makes us see a tragedy. Where we could only see a sunrise he enables us to see

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.

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.

Literature is at once the cause and the effect of social progress. It deepens our natural sensibilities, and strengthens by exercise our intellectual capacities. It stores up the accumulated experience of the race, connecting Past and Present into a conscious unity; and with this store it feeds successive generations, to be fed in turn by them. As its importance emerges into more general recognition, it necessarily draws after it a larger crowd of servitors, filling noble minds with a noble ambition.

In the development of the great series of animal organisms, the Nervous System assumes more and more of an imperial character. The rank held by any animal is determined by this character, and not at all by its bulk, its strength, or even its utility. In like manner, in the development of the social organism, as the life of nations becomes more complex, Thought assumes a more imperial character; and Literature, in its widest sense, becomes a delicate index of social evolution. Barbarous societies show only the germs of literary life. But advancing civilisation, bringing with it increased conquest over material agencies, disengages the mind from the pressure of immediate wants, and the loosened energy finds in leisure both the demand and the means of a new activity: the demand, because long unoccupied hours have to be rescued from the weariness of inaction; the means, because this call upon the energies nourishes a greater ambition and furnishes a wider arena.