upon which, in conformity with its aims, it must express itself; the internal occasions are received by the plastic nervous system, thus by the sympathetic nerve, this cerebrum abdominale, as mere stimuli, and the will thereupon reacts on the spot without the brain being conscious; the outward occasions are received by the brain, as motives, and the will reacts through conscious actions directed outwardly. Therefore the whole nervous system constitutes, as it were, the antennæ of the will, which it stretches towards within and without. The nerves of the brain and spinal cord separate at their roots into sensory and motory nerves. The sensory nerves receive the knowledge from without, which now accumulates in the thronging brain, and is there worked up into ideas, which arise primarily as motives. But the motory nerves bring back, like couriers, the result of the brain function to the muscle, upon which it acts as a stimulus, and the irritability of which is the immediate manifestation of the will. Presumably the plastic nerves also divide into sensory and motory, although on a subordinate scale. The part which the ganglia play in the organism we must think of as that of a diminutive brain, and thus the one throws light upon the other. The ganglia lie wherever the organic functions of the vegetative system require care. It is as if there the will was not able by its direct and simple action to carry out its aims, but required guidance, and consequently control; just as when in some business a man's own memory is not sufficient, and he must constantly take notes of what he does. For this end mere knots of nerves are sufficient for the interior of the organism, because everything goes on within its own compass. For the exterior, on the other hand, a very complicated contrivance of the same kind is required. This is the brain with its feelers, which it stretches into the outer world, the nerves of sense. But even in the organs which are in communication with this great nerve centre, in very simple cases the matter does not need to be brought before the highest authority, but a
