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viii has a notion, sufficiently correct for common purposes, of what is meant by wealth," wrote Mr. Mill, in the outset of his treatise; and contentedly proceeded, as if a chemist should proceed to investigate the laws of chemistry without endeavouring to ascertain the nature of fire or water, because every one had a notion of them, "sufficiently correct for common purposes."

2. But even that apparently indisputable statement was untrue. There is not one person in ten thousand who has a notion sufficiently correct, even for the commonest purposes, of "what is meant" by wealth; still less of what wealth everlastingly is, whether we mean it or not; which it is the business of every student of economy to ascertain. We, indeed, know (either by experience or in imagination) what it is to be able to provide ourselves with luxurious food, and handsome clothes; and if Mr. Mill had thought that wealth consisted only in these, or in the means of obtaining these, it would have been easy for him to have so defined it with perfect scientific accuracy. But he knew better: he knew that some kinds of wealth consisted in