=Physiological memory and processes.=—There is one phase of the unconscious which for the sake of completeness ought to be touched upon here, particularly as it is of considerable importance in any biological conception of intelligence. _There is every reason to believe that_ intrinsically _there is no essential difference between those physiological dispositions and activities of the lower nervous centers (subcortical ganglia and spinal cord), which condition and determine unconscious behavior, and those dispositions and activities of the higher centers—the cortex—which condition and determine both conscious and unconscious behavior._ The former are undoubtedly innate in that they are primarily conditioned by inherited anatomical and physiological prearrangements of neurons and the latter are pre-eminently acquired through experience although probably not wholly so. (Our knowledge of the localization of function in the nervous system is not sufficiently definite to enable us to delimit the localization of either innate or acquired dispositions.) The innate activities of the lower nervous centers so far as represented by movements can be clearly differentiated from those of the higher centers and recognized in the behavior of so-called “spinal” animals and of animals from which the cerebral hemispheres have been removed. In the former the connection between the spinal cord and all parts of the nervous system above having been severed, whatever movements are executed are performed by the spinal cord alone and therefore of course by unconscious processes. The latter animals, although their actions are more complex and closely approximate (with important differences) those of normal animals, are also devoid or nearly devoid of consciousness. I say “nearly devoid” because in the interpretation of the experiments it is difficult to disprove that, as some hold, elementary sensations—qua sensation—are retained, though others regard the animals as purely unconscious physiological machines.