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.
