Let us adopt a simpler and clearer plan with our pupil; let him have only two scales whose relations remain unchanged, and indicated by the same symbols. Whether he sings or plays, let him learn to fix his scale on one of the twelve tones which may serve as a base, and whether he modulates in D, C, or G, let the close be always Ut or La, according to the scale. In this way he will understand what you mean, and the essential relations for correct singing and playing will always be present in his mind; his execution will be better and his progress quicker. There is nothing funnier than what the French call "natural sol-faing;" it consists in removing the real meaning of things and putting in their place other meanings which only distract us. There is nothing more natural than sol-faing by transposition, when the scale is transposed. But I have said enough, and more than enough, about music; teach it as you please, so long as it is nothing but play. We are now thoroughly acquainted with the condition of foreign bodies in relation to our own, their weight, form, colour, density, size, distance, temperature, stability, or motion. We have learnt which of them to approach or avoid, how to set about overcoming their resistance or to resist them so as to prevent ourselves from injury; but this is not enough. Our own body is constantly wasting and as constantly requires to be renewed. Although we have the power of changing other substances into our own, our choice is not a matter of indifference. Everything is not food for man, and what may be food for him is not all equally suitable; it depends on his racial constitution, the country he lives in, his individual temperament, and the way of living which his condition demands. If we had to wait till experience taught us to know and choose fit food for ourselves, we should die of hunger or poison; but a kindly providence which has made pleasure the means of self-preservation to sentient beings teaches us through our palate what is suitable for our stomach. In a state of nature there is no better doctor than a man's own appetite, and no doubt in a state of nature man could find the most palateable food the most wholesome. Nor is this all. Our Maker provides, not only for those needs he has created, but for those we create for ourselves; and it is to keep the balance between our wants and our needs that he has caused our tastes to change and vary with our way of living. The further we are from a state of nature, the more we lose our natural tastes; or rather, habit becomes a second nature, and so completely replaces our real nature, that we have lost all knowledge of it.