Those who maintain that the brain is the organ of the mind, do not tell us what we are to understand by organ, brain, or mind; they seem to me to confound two things, the one with the other. In fact, they make no distinction between thought, mind, consciousness, and the _instrument_ by which these attributes become externally manifested. It is true, we have no evidence to show that the mind can operate independently of the nervous system; on the contrary, all physiological data bearing upon the question of this mutual relation, go to prove that where there is no nervous system there are no mental manifestations. Moreover, as G.H. Lewes says, "It is the man, and not the brain, that thinks: it is the organism as a whole, and not one organ, that feels and acts."[33] Every faculty manifests itself by means of matter, but it is important not to confound the faculty with the corporeal organ upon which the external manifestation of such faculty depends. The word organ is the name given to a part of the human frame by which we have sensation, and by means of which we do a certain act or work; such are the organs of sight, sound, smell, taste, and touch. All these organs are passive, and require to be operated on _ab extra_, precisely in the same way as the musical organ, which is an instrument constructed by man, requires man's interference for the production of musical sounds. When a musician sits down to a piano, the music cannot be said to be in the instrument, but in the soul of the performer. If the instrument be in good order, the inspiration of a Thalberg or of a Liszt will become apparent; break the cords or otherwise damage the instrument, and nothing but discordant strains are produced, the musical faculty of the performer, however, remaining unaffected. We are all familiar with Plato's celebrated dialogue on the Immortality of the Soul, where a disputant with Socrates inquires if the soul is not like the harmony of a lyre, more beautiful, more divine than the lyre itself, but yet is nothing without the lyre, vanishing when this instrument is broken.