The object of my researches is the brain. The cranium is only a faithful cast of the external surface of the brain, and is consequently but a minor part of the principal object.
Now I have demonstrated, that the convolutions of the brain are nothing but the peripheric expansion of the bundles of which it is composed; consequently the convolutions of the brain must be recognized as the parts in which the instincts, sentiments, propensities are exercised; and, in general the moral and intellectual forces.
Whoever would not remain in complete ignorance of the resources which cause him to act; whoever would seize, at a single philosophical glance, the nature of man and animals, and their relations to external objects; whoever would establish, on the intellectual and moral functions, a solid doctrine of mental diseases, of the general and governing influence of the brain in the states of health and disease, should know, that it is indispensable, that the study of the organization of the brain should march side by side with that of its functions.
The fate of the physiology of the brain is independent of the truth and falsity of my assertions relative to the laws of the organization of the nervous system, in general, and of the brain in particular, just as the knowledge of the functions of a sense is independent of the knowledge of the structure of its apparatus.
