‘MR. X. LEDBRAIN read a very ingenious communication, from which it appeared that the total number of legs belonging to the manufacturing population of one great town in Yorkshire was, in round numbers, forty thousand, while the total number of chair and stool legs in their houses was only thirty thousand, which, upon the very favourable average of three legs to a seat, yielded only ten thousand seats in all. From this calculation it would appear,—not taking wooden or cork legs into the account, but allowing two legs to every person,—that ten thousand individuals (one-half of the whole population) were either destitute of any rest for their legs at all, or passed the whole of their leisure time in sitting upon boxes. ‘SECTION D.—MECHANICAL SCIENCE. COACH-HOUSE, ORIGINAL PIG. _President_—Mr. Carter. _Vice-Presidents_—Mr. Truck and Mr. Waghorn. ‘PROFESSOR QUEERSPECK exhibited an elegant model of a portable railway, neatly mounted in a green case, for the waistcoat pocket. By attaching this beautiful instrument to his boots, any Bank or public-office clerk could transport himself from his place of residence to his place of business, at the easy rate of sixty-five miles an hour, which, to gentlemen of sedentary pursuits, would be an incalculable advantage. ‘THE PRESIDENT was desirous of knowing whether it was necessary to have a level surface on which the gentleman was to run. ‘PROFESSOR QUEERSPECK explained that City gentlemen would run in trains, being handcuffed together to prevent confusion or unpleasantness. For instance, trains would start every morning at eight, nine, and ten o’clock, from Camden Town, Islington, Camberwell, Hackney, and various other places in which City gentlemen are accustomed to reside. It would be necessary to have a level, but he had provided for this difficulty by proposing that the best line that the circumstances would admit of, should be taken through the sewers which undermine the streets of the metropolis, and which, well lighted by jets from the gas pipes which run immediately above them, would form a pleasant and commodious arcade, especially in winter-time, when the inconvenient custom of carrying umbrellas, now so general, could be wholly dispensed with. In reply to another question, Professor Queerspeck stated that no substitute for the purposes to which these arcades were at present devoted had yet occurred to him, but that he hoped no fanciful objection on this head would be allowed to interfere with so great an undertaking.