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Rh wanderings of imagination, and the thirsts of disease. 35. II. Secondly. The assertion that wealth is not only intrinsic, but dependent, in order to become effectual, on a given degree of vital power in its possessor, is opposed to another popular view of wealth;—namely, that though it may always be constituted by caprice, it is, when so constituted, a substantial thing, of which given quantities may be counted as existing here, or there, and exchangeable at rated prices.

In this view there are three errors. The first and chief is the overlooking the fact that all exchangeableness of commodity, or effective demand for it, depends on the sum of capacity for its use existing, here or elsewhere. The book we cannot read, or picture we take no delight in, may indeed be called part of our wealth, in so far as we have power of exchanging either for something we like better. But our power of effecting such exchange, and yet more, of effecting it to advantage, depends absolutely on the number of accessible persons who can understand the book, or enjoy the