The old Utopias are sessile organisations; the new must square itself to the needs of a migratory population, to an endless coming and going, to a people as fluid and tidal as the sea. It does not enter into the scheme of earthly statesmanship, but indeed all local establishments, all definitions of place, are even now melting under our eyes. Presently all the world will be awash with anonymous stranger men.

Now the simple laws of custom, the homely methods of identification that served in the little communities of the past when everyone knew everyone, fail in the face of this liquefaction. If the modern Utopia is indeed to be a world of responsible citizens, it must have devised some scheme by which every person in the world can be promptly and certainly recognised, and by which anyone missing can be traced and found.

This is by no means an impossible demand. The total population of the world is, on the most generous estimate, not more than 1,500,000,000, and the effectual indexing of this number of people, the record of their movement hither and thither, the entry of various material facts, such as marriage, parentage, criminal convictions and the like, the entry of the new-born and the elimination of the dead, colossal task though it would be, is still not so great as to be immeasurably beyond comparison with the work of the post-offices in the world of to-day, or the cataloguing of such libraries as that of the British Museum, or such collections as that of the insects in Cromwell Road. Such an index could be housed quite comfortably on one side of Northumberland Avenue, for example. It is only a reasonable tribute to the distinctive lucidity of the French mind to suppose the central index housed in a vast series of buildings at or near Paris. The index would be classified primarily by some unchanging physical characteristic, such as we are told the thumb-mark and finger-mark afford, and to these would be added any other physical traits that were of material value. The classification of thumb-marks and of inalterable physical characteristics goes on steadily, and there is every reason for assuming it possible that each human being could be given a distinct formula, a number or “scientific name,” under which he or she could be docketed. [Footnote: It is quite possible that the actual thumb-mark may play only a small part in the work of identification, but it is an obvious convenience to our thread of story to assume that it is the one sufficient feature.] About the buildings in which this great main index would be gathered, would be a system of other indices with cross references to the main one, arranged under names, under professional qualifications, under diseases, crimes and the like.

These index cards might conceivably be transparent and so contrived as to give a photographic copy promptly whenever it was needed, and they could have an attachment into which would slip a ticket bearing the name of the locality in which the individual was last reported. A little army of attendants would be at work upon this index day and night. From sub-stations constantly engaged in checking back thumb-marks and numbers, an incessant stream of information would come, of births, of deaths, of arrivals at inns, of applications to post-offices for letters, of tickets taken for long journeys, of criminal convictions, marriages, applications for public doles and the like. A filter of offices would sort the stream, and all day and all night for ever a swarm of clerks would go to and fro correcting this central register, and photographing copies of its entries for transmission to the subordinate local stations, in response to their inquiries. So the inventory............