Thus, provided the images (or image-substitutes for the imageless) have the due effects, deficiencies in their sensory aspect do not matter. But the proviso is important. In all forms of imagery sensory deficiencies are for many people signs and accompaniments of defective efficacy, and the habit of reading so as to allow the fullest development to imagery in its sensory aspect is likely to encourage the full development of this more essential feature, its efficacy, if the freaks and accidents of the sensory side are not taken too seriously.

Some exceptions to this general recommendation will occur to the reader. Instances in plenty may be found in which a full development of the sensory aspect of images is damaging to their effects. Meredith is a master of this peculiar kind of imagery:—

Thus piteously Love closed what he begat
The union of this ever diverse pair!
These two were rapid falcons in a snare,
Condemned to do the flitting of the bat.

The emotional as well as the intellectual effects of the various images here suggested are much impaired if we produce them vividly and distinctly.

Impulses, and References.—We have now to consider those more fundamental effects upon which stress has been laid above as the true places of the values of the experience. It will be well at this point to reconsult the diagram. The vertical lines which run capriciously downwards from the visual sensations of the words, through their tied imagery and onward to the bottom of the diagram, are intended to represent, schematically, streams of impulses flowing through in the mind.

They start in the visual sensations, but the depiction of the tied imagery is intended to show how much of their further course is due to it. The placing of the free imagery in the third division is intended to suggest that while some free images may arise from visual words alone, they take their character in a large part as a consequence of the tied imagery. Thus the great importance of the tied imagery, of the formal elements, is emphasised in the diagram.

These impulses are the weft of the experience, the warp being the pre-existing systematic structure of the mind, that organised system of possible impulses. The metaphor is of course inexact, since weft and warp here are not independent. Where these impulses run, and how they develop, depends entirely upon the condition of the mind, and this depends upon the impulses which have previously been active in it. It will be seen then that impulses—their direction, their strength, how they modify one another—are the essential and fundamental things in any experience. All else, whether intellectual or emotional, arises as a consequence of their activity. The thin trickle of stimulation which comes in through the eye finds an immense hierarchy of systems of tendencies poised in the most delicate stability. It is strong enough and rightly enough directed to disturb some of these without assistance. The literal sense of a word can be grasped on the prompting of the mere sight of it, without hearing it or mentally pronouncing it. But the effects of this stimulation are immensely increased and widened when it is reinforced by fresh stimulation from tied images, and it is through these that most of the emotional effects are produced. As the agitation proceeds new reinforcement comes with every fresh system which is excited. Thus, the paradoxical fact that so trifling an irritation as the sight of marks on paper is able to arouse the whole energies of the mind becomes explicable.

To turn now to references, the only mental happenings which are as closely connected with visual words as their tied images are those mysterious events which are usually called thoughts. Thus the arrow symbol in the hieroglyph should perhaps properly be placed near the visual impression of the word. The mere sight of any familiar word is normally followed by a thought of whatever the word may stand for. This thought is sometimes said to be the ‘meaning’, the literal or prose ‘meaning’ of the word. It is wise, however, to avoid the use of ‘meaning’ as a symbol altogether. The terms ‘thought’ and ‘idea’ are less subtle in their ambiguities, and when defined may perhaps be used without confusion.

What is essential in thought is its direction or reference to things. What is this direction or reference? How does a thought come to be ‘of’ one thing rather than another? What is the link between a thought and what it is ‘of’? The outline of one answer to these questions has been suggested in Chapter XI. A further account must here be attempted. Without a fairly clear, although, of course, incomplete view, it is impossible to avoid confusion and obscurity in discussing such topics as truth in art, the intellect-versus-emotion imbroglio, the scope of science, the nature of religion and many others with which criticism must deal.

The facts upon which speculations as to the relations between thoughts and the things which they are ‘of’ have been based, have as a rule been taken from introspection. But the facts which introspection yields are notoriously uncertain, and the special position of the observer may well preclude success. Introspection is competent, in some cases, to discover the relations between events which take place within the mind, but cannot by itself give information as to the relations of these events with the external world, and it is precisely this which we are inquiring into when we ask, What connection is there between a thought and that which it is a thought of? For an answer to this question we must look further.