ABSTRACT
The phenomena of memory, thus looked at as a necessary consequence of a fundamental property of the nervous elements, enter directly into the mechanism of the different regular processes of cerebral activity. The elements of the cerebral substance, the uncon scious agents of the manifestations of our psycho-intellectual life, work in silence at the operations which they accomplish in common. The auditory nerves preserve for a long time the trace of impressions which have set them vibrating. A musical air, and certain favourite refrains, involuntarily resound in one's ears, and that often in a most disagreeable manner. In the different segments of the spinal cord the persistence of impressions reveals itself very evidently in the accomplishment of all those co-ordinated movements which, not being a part of the hereditary patrimony of the motor apparatuses of the organism, are therefore acquired by habit, being the direct product of education.
