In sustaining its intercourse with nature, as well as for its own internal regulation, the human organism has recourse to a considerable number of psychosomatic or " mind-body " functioi^ or modes of operation. These functions may be indicated by the terms perception, memory, imagination, action, emotion, comprehension and elaboration or thinking. Like all organic operations these functions proceed from definable conditions; that is to say, they are induced by specific antecedents, which serve to throw the organism into commission for a given operation. On the bodily side, are neural trends or sets, glandular reserves, disposable energy and other available means. On the mental side, or (to be more exact) within phenomenal experience, are to be found intents, anticipations, forward-looking hints, premonitions and commands. Under our common conditions in the laboratory the anticipation of function usually appears in the formal instruction, " Move quickly when the stimulus light appears," " Attend to the fixation mark," " Read the syllables," and so on. The same form of preparation is likewise given in common life by such phrases as " Look at the valley when we approach the next turn," " Hold your hat on " and " Lend me a match." But just as much, whether we are in the street or in the laboratory, does the occasion itself (e.g., the wayside fountain, the approach of the street car, the half-familiar face, the fire-siren) or the organism itself ("I must get to work," " What was that name? " " I can if I try ") " instruct " the individual toward some functional performance. Thus is the psychological organism constantly set, tuned, bullied, encouraged or charged for seeing and for hearing, for remembering, for acting and suffering emotion,
