But already at a point in economic evolution far antedating the emergence of the lady, specialised consumption of goods as an evidence of pecuniary strength had begun to work out in a more or less elaborate system. The beginning of a differentiation in consumption even antedates the appearance of anything that can fairly be called pecuniary strength. It is traceable back to the initial phase of predatory culture, and there is even a suggestion that an incipient differentiation in this respect lies back of the beginnings of the predatory life. This most primitive differentiation in the consumption of goods is like the later differentiation with which we are all so intimately familiar, in that it is largely of a ceremonial character, but unlike the latter it does not rest on a difference in accumulated wealth. The utility of consumption as an evidence of wealth is to be classed as a derivative growth. It is an adaption to a new end, by a selective process, of a distinction previously existing and well established in men's habits of thought. In the earlier phases of the predatory culture the only economic differentiation is a broad distinction between an honourable superior class made up of the able-bodied men on the one side, and a base inferior class of labouring women on the other. According to the ideal scheme of life in force at the time it is the office of the men to consume what the women produce. Such consumption as falls to the women is merely incidental to their work; it is a means to their continued labour, and not a consumption directed to their own comfort and fulness of life. Unproductive consumption of goods is honourable, primarily as a mark of prowess and a perquisite of human dignity; secondarily it becomes substantially honourable to itself, especially the consumption of the more desirable things. The consumption of choice articles of food, and frequently also of rare articles of adornment, becomes tabu to the women and children; and if there is a base (servile) class of men, the tabu holds also for them. With a further advance in culture this tabu may change into simple custom of a more or less rigorous character; but whatever be the theoretical basis of the distinction which is maintained, whether it be a tabu or a larger conventionality, the features of the conventional scheme of consumption do not change easily. When the quasi-peaceable stage of industry is reached, with its fundamental institution of chattel slavery, the general principle, more or less rigorously applied, is that the base, industrious class should consume only what may be necessary to their subsistence. In the nature of things, luxuries and the comforts of life belong to the leisure class. Under the tabu, certain victuals, and more particularly certain beverages, are strictly reserved for the use of the superior class.