One mineral, perhaps more important than iron itself, remains to be mentioned. Coal, though very little used in any species of manufacture, was already the ordinary fuel in some districts which were fortunate enough to possess large beds, and in the capital, which could easily be supplied by water carriage, It seems reasonable to believe that at least one half of the quantity then extracted from the pits was consumed in London. The consumption of London seemed to the writers of that age enormous, and was often mentioned by them as a proof of the greatness of the imperial city. They scarcely hoped to be believed when they affirmed that two hundred and eighty thousand chaldrons that is to say, about three hundred and fifty thousand tons, were, in the last year of the reign of Charles the Second, brought to the Thames. At present three millions and a half of tons are required yearly by the metropolis; and the whole annual produce cannot, on the most moderate computation, be estimated at less than thirty millions of tons. [75] While these great changes have been in progress, the rent of land has, as might be expected, been almost constantly rising. In some districts it has multiplied more than tenfold. In some it has not more than doubled. It has probably, on the average, quadrupled. Of the rent, a large proportion was divided among the country gentlemen, a class of persons whose position and character it is most important that we should clearly understand; for by their influence and by their passions the fate of the nation was, at several important conjunctures, determined.