ABSTRACT
The concept of subconscious processes has been developed in the theories and interpretations of many psychologists. The doctrine of "the unconscious" or the "unconscious mind" (the two terms have not always the same meaning) came into psychology through the philosophers, and has been taken up by Freud and his disciples as the foundation of the "new psychology." The conception of "co-consciousness," although vaguely involved in many of the theories concerning the "subconscious" and the "unconscious," we owe primarily to Morton Prince, and it has been an exceedingly valuable contribution towards the clearing up of a much confused field.
