You denounce your adversaries as men who do not take “the least notice of the progress of experimental science.” This is a calumny. In fact, you yourself inform us that one of your adversaries is philosopher Fischer, a man who not only took notice of the progress of experimental science, but greatly contributed to such a progress by his own intelligent and indefatigable labors. You cannot therefore pretend that such a man lacked “positive knowledge.” Now, he says: “That the soul is immanent in the whole nervous system is proved, as it feels, perceives, and acts in every part thereof. I do not feel pain in a central part of the brain, but in a particular spot and place.” _Büchner._ “And yet what Fischer denies is undoubtedly the fact. The nerves themselves do not perceive; they merely call forth sensations by conducting the impressions received to the brain. We do not feel pain in the place injured, but in the brain. If a nerve of sensation be divided in its course to the brain, all the parts which are supplied by it lose their sensibility, for no other reason than that the conducting of the impression to the brain is no longer possible. Every man who has no knowledge of physiological processes believes the feeling of hunger to be in the stomach. This is not so; the brain alone makes us conscious of the feeling. If the nerve uniting brain and stomach be divided, hunger is at an end, nor does it return. Neither does anger arise in the liver, or courage in the chest, but in the brain only” (pp. 143, 144). “Habit and external appearance have led to the false notion that we feel in places subjected to external irritation. Physiology calls this relation ‘the law of eccentric phenomena.’ According to it, we falsely attribute the feeling perceived in the brain to the place where the impression is made.... Persons who have lost their arms or legs by amputation often feel during their whole lives, in atmospheric changes, pains in limbs which they no longer possess. If all his limbs were removed, man would still feel them. From these facts it can scarcely be doubted that there must exist in the brain a topography by means of which the various sensations of the different parts of the body arise. Every part of the body which can be separately perceived must have a corresponding spot in the brain which in some degree represents it in the forum of consciousness” (pp. 144, 145).