I also questioned them about the museum of old machines, and the cause of the apparent retrogression in all arts, sciences, and inventions. I learnt that about four hundred years previously, the state of mechanical knowledge was far beyond our own, and was advancing with prodigious rapidity, until one of the most learned professors of hypothetics wrote an extraordinary book (from which I propose to give extracts later on), proving that the machines were ultimately destined to supplant the race of man, and to become instinct with a vitality as different from, and superior to, that of animals, as animal to vegetable life. So convincing was his reasoning, or unreasoning, to this effect, that he carried the country with him; and they made a clean sweep of all machinery that had not been in use for more than two hundred and seventy-one years (which period was arrived at after a series of compromises), and strictly forbade all further improvements and inventions under pain of being considered in the eye of the law to be labouring under typhus fever, which they regard as one of the worst of all crimes. This is the only case in which they have confounded mental and physical diseases, and they do it even here as by an avowed legal fiction. I became uneasy when I remembered about my watch; but they comforted me with the assurance that transgression in this matter was now so unheard of, that the law could afford to be lenient towards an utter stranger, especially towards one who had such a good character (they meant physique), and such beautiful light hair. Moreover the watch was a real curiosity, and would be a welcome addition to the metropolitan collection; so they did not think I need let it trouble me seriously. I will write, however, more fully upon this subject when I deal with the Colleges of Unreason, and the Book of the Machines.