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others, but no idea—even the most abstract—can exist apart from an ultimate base. Second, every idea is equally a function of reference and control. As reference, the idea projects in the mind's view an anticipation of experiences and of the conditions upon which these experiences depend for their realization; as control, ideas are agencies in turning anticipations into realizations.54
To be more specific on both points: Since the days of Galton it has been almost a commonplace in psychology that ideas are embodied in forms of imagery which vary for and in different individuals. It has been maintained, it is true, that in abstract forms of thought, imagery disappears. This objection is met in two ways. For one, words—the vehicle of many abstract ideas—involve imagery of a most pronounced type: for another, every idea, when examined closely, discloses an image, no matter how much for the time being this has been driven into obscurity by the characteristics of reference and control. Furthermore, when we examine the anticipatory aspect of ideas, the presence of imagery both with reference to outcome and to conditions is so evident that its presence will scarcely be denied.
The second point may be illustrated in several ways. In everyday life anticipation and realization are inseparable from the nature and use of ideas. "Hat" means anticipation of protection to the head and the tendency toward setting in motion the conditions appropriate to the realization of this anticipation. The same factors are evident in the boy's definition of a knife as "something to whittle with." Again it is maintained that intelligence is an essential factor in human self-consciousness. By this is meant that human beings are universally aware in some degree of what they are about. And this awareness consists in understanding the meaning of their actions, of forecasting the outcome of various kinds of activity, of apprehending beforehand the conditions connected with determinate results. Within this sphere we speak of certain men as being pre-eminently intelligent, meaning that for such men outcomes are previewed and connected with their appropriate conditions far beyond the range of ordinary foresight. Finally, scientific intelligence is essentially of this kind. It aims at understanding the varying types of process which operate in nature and thus at possessing itself of information with reference to results to be expected under determinate conditions. For example, the knowledge acquired in his researches by Louis Pasteur enabled him to predict the life or death of animals inoculated with charbon virus according as they had or had not been vaccinated previously. His information, in other words, became an instrument for the control and eradication of the disease. And what is true of this case is true of all science. To the scientist ideas are "working hypotheses" and have their value only as they enable him to predict, and to control. And while it is true that the scientist usually overlooks the so-called practical value of his discoveries, it is none the less true that in due time the inventor follows the investigator. The investigator is content to construct and show the truth of his idea. The inventor assumes the truth of the investigator's work and carries his idea as a constructive principle into the complications of life. To both men "knowledge is power," although the "power" may be realized in connection with different interests. But if this be true, ideas can no longer be regarded as copies in individual experience of some pre-existing reality. They are rather instruments for transforming and directing experience, by way of constructing anticipations and the conditions appropriate to their realization. Herein also consists their truth or falsity. The true idea is reliable, carrying us from anticipation to realization; the false idea is unreliable, and fails in bringing the promised result.
Now, in the development of instruments generally, we may distinguish a rule-of-thumb or more or less unreflective stage of construction, and one entirely reflective. As to use there is the distinction of inexpert and expert control. This leads us to expect that in the thought-function also certain typical stages of construction and of control may be found. To the investigation of this point we shall next direct attention.
II
In its development from crude to expert forms judgment exhibits three typical stages—the impersonal, the reflective, and the intuitive. These we shall consider in order of development. But first it is to be noticed that these stages of judgment are not to be regarded as hard and fast distinctions of the kind that no indications of the higher are to be found in the lower types, but rather as working distinctions within a process of continuous development.
1. The impersonal judgment.—Ever since the days of the Greek grammarians the impersonal judgment has been considered an anomaly in logic. And the reason is not far to seek. From the time of Aristotle it has been customary to maintain that judgments, when analyzed, disclose a subject and a predicate. Logically considered, these appear to be entirely correlative, for, as Erdmann puts it,55 "an event without a substrate, a quality without a subject, is altogether unpresentable." But there is in all languages a class of judgments, such as, "It rains," "It snows," "Fire!" in which no directly asserted subject is discoverable. To these the name impersonal and subjectless has been given. Here then is the difficulty. If we admit that the impersonal expression involves predication, we must, in all consistency, search for a subject, while at the same time the subject refuses to disclose itself. In ancient days the orthodox logician confined his search to language and to the spoken or written proposition. The unorthodox critic maintained, in opposition to this, that a subject was provided only by warping and twisting the natural sense of the impersonal expression. And thus the matter stood until the development of modern comparative philology. It was then demonstrated beyond the possibility of doubt that the "it" (or its equivalent) of the impersonal is a purely contentless form word. Language provides no subject whatsoever. So strong, however, is the hold of tradition that the search has been renewed. Attention has been turned upon the mental processes involved, and this time with more apparent result. Although there has been no general agreement with reference to the subject, a classification of the different views may still be made. (a) The subject is universal and undetermined; (b) it is individual and more or less determined; (c) between these extremes lies almost every intermediate degree conceivable.
Ueberweg maintains that the subject of the impersonal is the actual totality of present experience. When we ask, "What rains?" we must understand a reference to our general environment, in which no special element is singled out. Sigwart, on the other hand, maintains that the subject can be construed only as the actual sense-impression. This diversity of opinion might seem to indicate that, were it not for the constraining power of theory, a subject would scarcely be thought of for the impersonal. Still it must be admitted that when we examine the impersonal expression closely we can discover a sense-impression, whether definite or indefinite, combined with an idea. This would seem to give the case to the orthodox logician, for he will at once claim the sense-impression as the subject and the idea as the predicate of the judgment. But we must have a care. Predication is usually held to consist in a reference of predicate to subject. The factors of the judgment are, as it were, held apart. In the impersonal no such thing as this can be discovered. The meaning is so close a unity that impression and idea are entirely fused. We may analyze the expression and find them there, but by so doing we destroy the immediacy which is an essential characteristic of the impersonal. In other words, the impersonal does not analyze itself. It is entirely unconscious of its make-up. And yet it is definite and applies itself with precision: If I am in a lecture-hall and hear the fire-alarm, the thought "Fire!" which enters my mind leads to an immediate change in my conduct. I arise, move quietly out, and prepare for duty. If, on the other hand, I open the street door and the rain strikes my face, I ejaculate "Raining!" turn, reach for my umbrella, and pass out protected. In both cases I act knowingly and with meaning, but I do not analyze the movement either of thought or of action. A correlate to the unreflective impersonal judgment is found in early custom. Custom embodies social ideas and is an instrument for the determination and control of action. Individuals moved by custom know what they are about and act with precision according as custom may demand. But it is notorious that custom is direct and unreflective. It represents social instruments of control which have grown up without method and which represent the slow accretion of rule-of-thumb activities through many ages. So in the impersonal judgment we have a type of intellectual instrument which has been brought to a high degree of precision in use, but which still retains the simplicity and certainty of an unquestioned instrument of action. For this reason, whatever complexity of elements the impersonal may present to