Fortunately, a system never lives otherwise than as a system lives. That of the moment is abandoned for the sake of another: and almost always for a perfectly opposite one. Systems multiply and pass away; and we are indebted to the systems themselves for an escape from the mischiefs of systems. NOTES. NOTE I. ANATOMICAL RELATIONS SUPPOSED BY GALL TO EXIST BETWEEN THE ORGANS OF THE EXTERNAL SENSES, AND THE ORGANS OF THE INTELLECTUAL FACULTIES. Page 82. _According to Gall, the origin, the development, the structure and mode of termination, as to the organs of the faculties of the soul and the organs of the external senses, every thing is similar, every thing is in common._ It is known that two substances compose the nervous system—the gray matter, and the white or fibrous matter. Well, according to Gall, one of these substances produces the other. The _gray matter_ produces the _white matter_. Wherever, therefore, there happens to be any _gray matter_, white matter must appear; that is to say, _nervous fibres_,[184] _nervous filaments_, nerves. All the nerves in the body must arise in this way. The spinal nerves arise from the gray matter which is in the interior of the spinal marrow; the cerebral nerves from the gray matter that is in the interior of the medulla oblongata. Hence, the nerves of the body are _organs of the senses_. On the other hand, the brain and the cerebellum,[185] which are _the organs of the faculties of the soul_, must arise like the nerves: the brain from the gray matter of the _pyramidal eminences_; the cerebellum from the gray matter that surrounds the _restiform bodies_. In the second place, whenever a nerve traverses a mass of gray matter, it receives from it, according to Gall, certain new nervous filaments; and in this way it grows and developes itself. The cerebrum and cerebellum will not fail therefore to grow and be developed likewise. The primitive bundles of the cerebellum, (_the restiform bodies_,) will grow by means of the filaments which will be imparted to them by the gray matter of the _ciliary body_: the primitive bundles of the cerebrum, (the _pyramidal eminences_,) by the filaments imparted to them by, first, the gray matter of the _pons varolii_; secondly, by that of the _optic strata_; and then by that of the olivary bodies, _corpora striata_, &c. &c. Finally, in the same manner as a nerve of sense expands at its termination, and by means of such expansion forms the organ of the sense, so the primitive bundles of fibres of the brain and of the cerebellum terminate in expansions, and constitute the _organs of the internal senses_; that is to say, the lobes of the cerebellum and the hemispheres of the brain.[186] NOTE II. DIFFERENCE BETWEEN INSTINCT AND UNDERSTANDING. Page 64 (Note). _And he does not see that as to the instincts and the understanding all is contrast._