The alchemy by which a gentleman who has never seen a coal mine distills the contents of that place of gloom into elegant chambers in London and a place in the country is not the monopoly of royalty owners. A similar feat of prestidigitation is performed by the {89} owner of urban ground-rents. In rural districts some landlords, perhaps many landlords, are partners in the hazardous and difficult business of agriculture, and, though they may often exercise a power which is socially excessive, the position which they hold and the income which they receive are, in part at last, a return for the functions which they perform. The ownership of urban land has been refined till of that crude ore only the pure gold is left. It is the perfect sinecure, for the only function it involves is that of collecting its profits, and in an age when the struggle of Liberalism against sinecures was still sufficiently recent to stir some chords of memory, the last and greatest of liberal thinkers drew the obvious deduction. "The reasons which form the justification ... of property in land," wrote Mill in 1848, "are valid only in so far as the proprietor of land is its improver.... In no sound theory of private property was it ever contemplated that the proprietor of land should be merely a sinecurist quartered on it." Urban ground-rents and royalties are, in fact, as the Prime Minister in his unregenerate days suggested, a tax which some persons are permitted by the law to levy upon the industry of others. They differ from public taxation only in that their amount increases in proportion not to the nation's need of revenue but to its need of the coal and space on which they are levied, that their growth inures to private gain not to public benefit, and that if the proceeds are wasted on frivolous expenditure no one has any right to complain, because the arrangement by which Lord Smith spends wealth produced by Mr. Brown on objects which do no good to either is part {90} of the system which, under the name of private property, Mr. Brown as well as Lord Smith have learned to regard as essential to the higher welfare of mankind.