At a certain altitude of fortune the financier thrives, the club-man, the society woman, all those in short for whom the strictly necessary includes a certain number of domestics and equipages, as well as several town and country houses. Further on flourishes the rich upper middle class, with its own standards and life. In other regions we find men of ample, moderate, or small means, and very unlike exigencies. Then come the people--artisans, day-laborers, peasants, in short, the masses, who live dense and serried like the thick, sturdy growths on the summits of the mountains, where the larger vegetation can no longer find nourishment. In all these different regions of society men live, and no matter in which particular regions they flourish, all are alike human beings, bearing the same mark. How strange that among fellows there should be such a prodigious difference in requirements! And here the analogies of our comparison fail us. Plants and animals of the same families have identical wants. In human life we observe quite the contrary. What conclusion shall we draw from this, if not that with us there is a considerable elasticity in the nature and number of needs? Is it well, is it favorable to the development of the individual and his happiness, and to the development and happiness of society, that man should have a multitude of needs, and bend his energies to their satisfaction? Let us return for a moment to our comparison with inferior beings. Provided that their essential wants are satisfied, they live content. Is this true of men? No. In all classes of society we find discontent. I leave completely out of the question those who lack the necessities of life. One cannot with justice count in the number of malcontents those from whom hunger, cold, and misery wring complaints. I am considering now that multitude of people who live under conditions at least supportable. Whence comes their heart-burning? Why is it found not only among those of modest though sufficient means, but also under shades of ever-increasing refinement, all along the ascending scale, even to opulence and the summits of social place? They talk of the contented middle classes. Who talk of them? People who, judging from without, think that as soon as one begins to enjoy ease he ought to be satisfied. But the middle classes themselves--do they consider themselves satisfied? Not the least in the world. If there are people at once rich and content, be assured that they are content because they know how to be so, not because they are rich. An animal is satisfied when it has eaten; it lies down and sleeps. A man also can lie down and sleep for a time, but it never lasts. When he becomes accustomed to this contentment, he tires of it and demands a greater. Man's appetite is not appeased by food; it increases with eating. This may seem absurd, but it is strictly true.