One of the chief utilities of conscious memory is the means it offers the psycho-physiological organism to make use of past experiences to adapt present conduct to a present situation. This the brainless animal cannot do. Hence it is a mindless physiological automaton. All the actions performed by it, however complex they may be, are unquestionably performed and primarily conditioned by inherited neural arrangements and dispositions. They may be even regarded as complexly compounded reflex processes similar excepting in complexity, as Sherrington has held, to the mechanisms of the spinal cord. The behavior of the animal is therefore by definition instinctive. But even so this fact in no way throws light upon the intrinsic nature of the physiological process, but only upon the conditions of its occurrence. Acquired behavior is also conditioned—conditioned by acquired dispositions. The difference physiologically between the two is that in instinctive behavior the neural processes are confined to pathways established by evolutionary development, and in acquired behavior to pathways established by experience. Both must be conditioned by pathways, and the process in its inner nature must be the same in both. Many cortical processes, to be sure, are conscious—i.e., correlated with consciousness—but probably not all. And this quality of consciousness permitting of conscious memory is of great utility in the organization of acquired dispositions that provide the means for the adaption of the animal to each new environmental situation. Furthermore, it is not at all certain that the behavior of the decerebrate animal is not in part determined by _secondarily acquired dispositions_. In the normal animal instinctive actions become modified and perfected after the very first performances of the act by conscious experience[128] and it is not at all certain that dispositions so acquired and essential for these modifications are not conserved and incorporated in the unconscious neural arrangements of the subcortical centers. So far as this may be the case the acquired modifications of instinctive behavior may be manifested in the actions of the decerebrate animals. In other words, the unconscious processes of the lower nervous centers motivating movements (and visceral functions) may include _acquired dispositions or physiological memories_.