The pathology of the nervous system has heretofore and in a large measure occupied a place by itself, that is, a place apart from pathology in general. Recent developments, however, have shown that only in a limited sense is this justified. Many of the organic diseases of the nervous system—some of its neoplasms and system diseases—must of necessity occupy a separate and distinct position, but is this true of the functional diseases and especially of those which are classified as mental? Are not the phenomena of the latter to be included in the general pathologic processes going on in the body as a whole? Let us see what the facts indicate.
First, the various functions of the human organism, digestion, nutrition, the maintenance of the bodily temperature, the production of nervous and muscular energy are all the expression of chemical processes; secondly, these chemical processes, manifold and complicated, are intimately