The “Library” of cancelled notes—not to be confounded with the Bank Library proper—is situated in the Bank vaults, and we are indebted to the courtesy of the Bank-note Librarian for the following curious and interesting statistics respecting his stock. The stock of paid notes for five years—the period during which, as before stated, the notes are preserved for reference—is about seventy-seven million seven hundred and forty-five thousand in number. They fill thirteen thousand four hundred boxes, about eighteen inches long, ten wide, and nine deep. If the notes could be placed in a pile one upon another, they would reach to a height of five and two-third miles. Joined end to end they would form a ribbon twelve thousand four hundred and fifty-five miles long, or half way round the globe; if laid so as to form a carpet, they would very nearly cover Hyde Park. Their original value is somewhat over seventeen hundred and fifty millions, and their weight is about ninety-one tons. The immense extent of space necessary to accommodate such a mass in the Bank vaults may be imagined. The place, with its piles on piles of boxes reaching far away into dim distance, looks like some gigantic wine-cellar or bonded warehouse. As each day adds, as we have seen, about fifty thousand notes to the number, it is necessary to find some means of destroying those which have passed their allotted term of preservation. This is done by fire, about four hundred thousand notes being burnt at one time, in a furnace specially constructed for that purpose. Formerly, from some peculiarity in the ink with which the notes were printed, the cremated notes burnt into a solid blue clinker; but the composition of the ink has been altered, and the paper now burns to a fine gray ash. The fumes of the burning paper are extremely dense and pungent; and to prevent any nuisance arising from this cause, the process of cremation is carried out at dead of night, when the city is comparatively deserted. Further, in order to mitigate the density of the fumes, they are made to ascend through a shower of falling water, the chimney shaft being fitted with a special shower-bath arrangement for this purpose.