The expression 'field of consciousness' has but recently come into vogue in the psychology books. Until quite lately the unit of mental life which figured most was the single 'idea,' supposed to be a definitely outlined thing. But at present psychologists are tending, first, to admit that the actual unit is more probably the total mental state, the entire wave of consciousness or field of objects present to the thought at any time; and, second, to see that it is impossible to outline this wave, this field, with any definiteness.
As our mental fields succeed one another, each has its centre of interest, around which the objects of which we are less and less attentively conscious fade to a margin so faint that its limits are unassignable. Some fields are narrow fields and some are wide fields. Usually when we have a wide field we rejoice, for we then see masses of truth together, and often get glimpses of relations which we divine rather than see, for they shoot beyond the field into still remoter regions of objectivity, regions which we seem rather to be about to perceive than to perceive actually. At other times, of drowsiness, illness, or fatigue, our fields may narrow almost to a point, and we find ourselves correspondingly oppressed and contracted.
Different individuals present constitutional differences in this matter of width of field. Your great organizing geniuses are men with habitually vast fields of mental vision, in which a whole programme of future operations will appear dotted out at once, the rays shooting far ahead into definite directions of advance. In common people there is never this magnificent inclusive view of a topic. They stumble along, feeling their way, as it were, from point to point, and often stop entirely. In certain diseased conditions consciousness is a mere spark, without memory of the past or thought of the future, and with the
